Top 15 California Billing Laws | A Complete Compliance Guide

California billing laws govern how healthcare providers, insurers, and billing companies handle claims submission, payment, patient data, and debt collection across the state. These laws combine federal mandates with California-specific statutes that often set stricter standards than national requirements. Providers operating in California must comply with both layers simultaneously.

The 15 laws covered in this guide range from patient protection statutes such as Assembly Bill 72 and Senate Bill 1061 to foundational compliance frameworks like HIPAA and the California Confidentiality of Medical Information Act (CMIA). Each law carries distinct deadlines, penalties, and procedural requirements that directly affect revenue cycle operations.

This guide organizes California billing laws by search demand and compliance priority. Laws with the broadest impact on billing workflows and patient financial rights appear first. Providers who understand these 15 statutes reduce claim denials and maintain compliant operations throughout California, on their own or with the help of a California medical billing company.

Law 1. Assembly Bill 72 (AB 72) – Balance Billing and Surprise Bill Protection Law

Assembly Bill 72, enacted in 2016 and effective January 1, 2017, is California’s primary law protecting patients from surprise medical bills. AB 72 prohibits out-of-network providers from billing patients beyond their in-network cost-sharing amount when care is delivered at an in-network facility. The law applies to non-emergency services, elective procedures, and certain specialty services, including anesthesiology, radiology, and pathology.

Under AB 72, health plans must reimburse out-of-network providers at the greater of the average contracted rate or 125% of the Medicare fee schedule rate. Patients remain responsible only for their normal in-network deductible, copay, or coinsurance regardless of the provider’s network status.

What AB 72 Covers

• Non-emergency services at in-network facilities: Patients treated by out-of-network physicians at in-network hospitals pay only in-network cost-sharing amounts.
• Emergency care billing: Out-of-network emergency providers cannot balance bill patients beyond in-network cost-sharing under the Knox-Keene Act, which works in conjunction with AB 72.
• Provider consent requirements: Out-of-network providers may balance bill only if they give the patient 72 hours’ written notice of their out-of-network status and an estimated cost before the service.
• Dispute resolution: Payment disputes between plans and out-of-network providers go through an Independent Dispute Resolution (IDR) process, not to the patient.

Key Billing Compliance Requirements Under AB 72

The following table summarizes the core billing requirements that California providers must meet under AB 72.

Requirement	Detail	Applies To
In-network cost-sharing only	Patients billed at in-network rates regardless of provider network status	All OON providers at INN facilities
Reimbursement floor	Greater of average contracted rate or 125% of Medicare fee schedule	Health plans paying OON claims
72-hour written notice	Required before balance billing; must include cost estimate and network status	Non-emergency OON providers
IDR process	Mandatory dispute resolution between payer and provider; patients excluded	Payers and OON providers

Anesthesia and radiology specialists account for 68% of surprise billing cases in California. AB 72 directly addresses these specialties by limiting billing to in-network rates at in-network facilities.

AB 72 and the Federal No Surprises Act

The federal No Surprises Act took effect January 1, 2022, and built on AB 72’s framework. California’s Department of Managed Health Care (DMHC) confirmed in March 2022 that AB 72 preempts the federal No Surprises Act for fully insured plans regulated by the state. Self-insured ERISA plans remain subject to the federal law. This dual-layer system means California providers must identify the governing plan type before applying billing rules.

Law 2. Senate Bill 1061 (SB 1061) – Medical Debt Credit Reporting Ban

Senate Bill 1061, signed by Governor Newsom on September 24, 2024, and effective January 1, 2025, prohibits healthcare providers, billing companies, and collection agencies from reporting medical debt to consumer credit reporting agencies. The law also prohibits credit reporting agencies from including medical debt in consumer credit reports, regardless of the amount owed.

SB 1061 was authored by Senator Monique Limón (D-Santa Barbara). Approximately 38% of California residents carry some form of medical debt, according to the California Health Care Foundation. The law decouples medical debt from personal credit scores across the state.

Three Core Prohibitions Under SB 1061

• Reporting ban (effective January 1, 2025): Providers, billing vendors, and collection agencies may not furnish medical debt information to any consumer credit reporting agency (CRA), regardless of the amount or age of the debt.
• Credit decision ban: Any person or entity using a consumer credit report for a credit transaction may not use medical debt listed on the report as a negative factor in credit decisions.
• Void debt penalty: If a provider knowingly reports medical debt to a CRA in violation of SB 1061, the underlying medical debt becomes void and unenforceable.

Contract Language Requirement (Effective July 1, 2025)

Any medical debt contract entered into on or after July 1, 2025, must include the following statutory language required by Civil Code Section 1785.27:

“A holder of this medical debt contract is prohibited by Section 1785.27 of the Civil Code from furnishing any information related to this debt to a consumer credit reporting agency. In addition to any other penalties allowed by law, if a person knowingly violates that section by furnishing information regarding this debt to a consumer credit reporting agency, the debt shall be void and unenforceable.”

Contracts that omit this language after July 1, 2025, are void and unenforceable. Practices must update all patient financial agreements, payment plan documents, and Advanced Beneficiary Notices before this date.

SB 1061 Operational Impact on Billing Departments

Area Affected	Required Action	Deadline
Credit reporting workflow	Remove all medical debt reporting from collection agency agreements	January 1, 2025
Patient financial contracts	Add Civil Code §1785.27 language to all financial agreements	July 1, 2025
Third-party billing vendors	Update vendor contracts to prohibit CRA reporting	January 1, 2025
Staff training	Train billing and collections staff on SB 1061 requirements	Ongoing

Law 3. HIPAA – Healthcare Privacy and Data Security Standards

The Health Insurance Portability and Accountability Act (HIPAA), enacted in 1996 and administered by the U.S. Department of Health and Human Services (HHS), sets the federal baseline for protecting patient health information in billing and clinical operations. HIPAA applies to all covered entities in California, including hospitals, physician practices, health plans, and healthcare clearinghouses, as well as their business associates.

HIPAA’s Privacy Rule governs the use and disclosure of Protected Health Information (PHI). The Security Rule sets technical, physical, and administrative safeguards for electronic PHI (ePHI). The Enforcement Rule establishes penalties ranging from $100 to $50,000 per violation, with an annual cap of $1.9 million per violation category.

HIPAA Billing Compliance Requirements

• Minimum necessary standard: Billing staff may access only the PHI necessary to perform their specific billing function. Full medical records are not required for claims submission.
• Business Associate Agreements (BAAs): Any third-party medical billing companies in California, clearinghouse, or collection agency that handles PHI must sign a BAA before receiving patient data.
• Electronic transaction standards: Claims submitted electronically must use HIPAA-standard formats, including ASC X12 837P (professional claims), 837I (institutional claims), and 835 (remittance advice).
• Breach notification: Billing data breaches affecting 500 or more individuals require notification to HHS and media outlets within 60 days of discovery.

HIPAA vs. California CMIA

California law often supersedes HIPAA where state protections are stronger. The following table identifies the most important differences between HIPAA and CMIA for billing departments.

Area	HIPAA Standard	California CMIA Standard
Patient right of action	No private lawsuit right under HIPAA alone	Patients can sue for unauthorized disclosure under CMIA
Civil penalties	Up to $50,000 per violation	Up to $25,000 per patient per violation
Record access timeframe	30 days to fulfill access request	Much shorter response window under PAHRA
App and digital health coverage	Limited scope for non-covered entity apps	CMIA extends to reproductive and sexual health digital apps

California providers must apply whichever standard is more protective. In practice, CMIA frequently controls billing-related disclosure decisions because of its broader definitions and stricter enforcement mechanisms.

Law 4. California Confidentiality of Medical Information Act (CMIA)

The California Confidentiality of Medical Information Act (CMIA), codified at Civil Code §56 et seq., is California’s primary medical privacy statute. Established in 1981, CMIA predates HIPAA by more than 15 years. The law prohibits providers, healthcare service plans, contractors, and pharmaceutical companies from disclosing patient medical information without a valid written authorization signed by the patient or the patient’s legal representative.

CMIA applies to billing operations because claims processing involves accessing, transmitting, and disclosing identifiable medical information. Any billing department that shares patient data with insurers, clearinghouses, or collection agencies must comply with CMIA disclosure requirements.

CMIA Requirements for Billing Departments

• Written authorization: Disclosures of medical information for non-treatment, non-payment purposes require a valid written authorization in at least 14-point type that clearly separates authorization language from other document content.
• Secure storage and disposal: Medical records and billing documents containing patient information must be stored, maintained, and disposed of in ways that preserve confidentiality. Electronic systems must log all access and changes.
• Electronic record integrity: Electronic billing systems must automatically record and preserve any change or deletion of stored medical information, including the identity of the person who made the change and the date and time of access.
• Contractor agreements: Third-party billing companies handling CMIA-protected data must agree to the same confidentiality requirements as the covered provider.

CMIA Penalties

CMIA violations carry civil penalties of up to $25,000 per patient for each unauthorized disclosure. Knowing and willful violations also carry administrative fines of up to $2,500 per violation. Criminal penalties, including fines and imprisonment, apply to willful or malicious unauthorized disclosures. Patients have a private right of action to sue providers directly for CMIA violations resulting in economic loss or personal injury.

Law 5. California Prompt Payment and Timely Filing Laws

California’s prompt payment laws set mandatory deadlines for insurers to pay claims and for providers to submit them. These laws apply differently based on payer type, with distinct timelines for commercial insurers, Medi-Cal, Medicare, and workers’ compensation. Providers who miss submission deadlines forfeit payment rights; payers who miss payment deadlines owe interest and penalties.

Timely Filing Deadlines by Payer Type

Payer Type	Submission Deadline	Legal Authority
Commercial insurers	12 months from date of service	California Health and Safety Code §1371
Medi-Cal (initial)	6 months from date of service	DHCS billing guidelines
Medi-Cal (resubmission)	Within 12 months of the initial 6-month deadline	DHCS resubmission rules
Medicare	12 months from date of service	42 CFR §424.44 / CMS Claims Processing Manual
Workers’ Compensation	12 months from date of service; liens within 5 years	California Labor Code §4603.2

Prompt Payment Deadlines for Payers

California law establishes strict payment deadlines that insurers must meet after receiving a clean claim.

• Commercial insurers: Must pay or deny clean claims within 30 working days for electronic claims and 45 working days for paper claims under Health and Safety Code §1371.
• Medi-Cal: Must pay clean claims within 30 calendar days of receipt under DHCS guidelines.
• Medicare: Medicare Administrative Contractors (MACs) must reimburse clean claims within 30 calendar days under CMS’s Prompt Payment Rule (42 CFR §405.926). Interest accrues automatically after this window.
• Workers’ Compensation: Carriers must pay accepted bills within 45 working days after receiving complete claim documentation under Labor Code §4603.2(b). Late payments incur interest and penalties.

Consequences of Missing Filing Deadlines

Providers who miss timely filing deadlines generally forfeit all payment rights. Medi-Cal allows resubmission within 12 months of the original deadline with written justification documenting delays caused by patient eligibility verification issues, billing system outages, or pending third-party liability determinations. Workers’ Compensation providers lose both payment rights and lien rights after the 12-month submission window unless the treatment qualifies under exceptions in California Code of Regulations §10770.1.

Law 6. Medi-Cal Billing Regulations

Medi-Cal is California’s Medicaid program, jointly funded by the state and federal governments. The California Department of Health Care Services (DHCS) administers Medi-Cal, while the Centers for Medicare and Medicaid Services (CMS) provides federal oversight. Providers who bill Medi-Cal must meet enrollment, credentialing, authorization, and coding requirements that differ significantly from commercial and Medicare billing workflows.

Core Medi-Cal Billing Requirements

• Active enrollment: Providers must maintain active Medi-Cal enrollment and complete revalidation every 5 years. Claims submitted under an inactive or incorrect enrollment status are automatically denied.
• Prior authorization: Many Medi-Cal services require prior authorization before rendering care. Billing for services without required authorization results in claim denial and potential recoupment.
• Covered services verification: Not all services covered by commercial insurers are covered by Medi-Cal. Billing staff must verify coverage using the Medi-Cal Provider Manual before submitting claims.
• Reimbursement rates: Effective January 1, 2024, AB 118 raised Medi-Cal reimbursement rates for primary care, obstetric, and certain outpatient mental health services to the greater of 87.5% of the Medicare fee schedule or the prior Medi-Cal rate.

Medi-Cal Billing Compliance Areas

Compliance Area	Requirement	Common Error
Provider enrollment	Active enrollment before claim submission	Billing under expired NPI or inactive enrollment
Service authorization	Authorization documented before billing	Billing authorized services under wrong authorization number
Coding accuracy	ICD-10-CM and CPT codes must match documented services	Upcoding or using non-covered procedure codes
Timely submission	6-month initial deadline; 12-month for resubmissions	Missing the initial 6-month window without documentation
Retroactive eligibility	Claims allowed up to 12 months from eligibility notification	Not verifying retroactive eligibility status before writing off

Law 7. California Workers’ Compensation Billing Laws

Workers’ compensation billing in California operates under a distinct legal framework governed by the California Labor Code and the Division of Workers’ Compensation (DWC). Labor Code §4603.2 establishes the core payment timelines for workers’ compensation medical claims, while the Official Medical Fee Schedule (OMFS) sets maximum reimbursement rates for services rendered to injured workers.

Workers’ compensation claims follow a different submission and dispute process than commercial insurance claims. Providers must submit bills using the workers’ compensation billing format, and payers must respond through the bill review process before any dispute escalation.

Key Workers’ Compensation Billing Rules

• Payment deadline: California workers’ compensation carriers must pay accepted bills within 45 working days of receiving complete documentation under Labor Code §4603.2(b). Interest and penalties apply to late payments.
• OMFS compliance: All bills must comply with the Official Medical Fee Schedule. Providers may not bill above OMFS rates except through an allowed fee schedule exception process.
• IBR process: Providers and patients who dispute a bill review outcome must file for Independent Bill Review (IBR) within 90 calendar days of receiving the Explanation of Review (EOR). The DWC strictly enforces this deadline; missed deadlines result in automatic dismissal.
• Lien filing: Providers who treat injured workers without employer authorization may file liens against the workers’ compensation claim. Liens must be filed within 5 years of the date of service under California Code of Regulations §10770.1.
• Submission deadline: Medical bills must be submitted within 12 months of the date of service. Late submissions result in forfeiture of payment and lien rights unless qualifying exceptions apply.

Law 8. Federal No Surprises Act

The federal No Surprises Act (NSA), effective January 1, 2022, prohibits balance billing patients for emergency and certain non-emergency out-of-network services at in-network facilities. The NSA applies nationwide and covers self-insured ERISA employer health plans not subject to state law preemption. For fully insured plans regulated by California, Assembly Bill 72 preempts the federal No Surprises Act as confirmed by the DMHC in March 2022.

NSA Coverage Areas

• Emergency care: Out-of-network emergency services are billed at in-network cost-sharing rates, regardless of hospital network status or provider participation.
• Non-emergency services at in-network facilities: Out-of-network providers delivering non-emergency care at in-network hospitals cannot balance bills unless they provide 72-hour advance written notice and receive the patient’s written consent.
• Air ambulance services: The NSA added federal protections for air ambulance billing that California’s AB 72 did not originally cover. Air ambulance providers cannot balance-bill insured patients for covered transports from in-network facilities.
• Good Faith Estimates: Providers must supply uninsured and self-pay patients with a Good Faith Estimate of expected charges before scheduled services. Patients who receive bills exceeding the estimate by $400 or more can initiate the federal dispute resolution process.

NSA vs. AB 72: Which Law Governs

Plan Type	Governing Law	Dispute Process
Fully insured state-regulated plans	California AB 72 and Knox-Keene Act	California IDR process
Self-insured ERISA employer plans	Federal No Surprises Act	Federal IDR process
Medicare Advantage plans	Federal rules apply	Medicare appeals process
Medi-Cal managed care plans	DHCS regulations and Knox-Keene Act	DHCS grievance process

Law 9. AB 716 – Ground Ambulance Balance Billing Law (2024)

Assembly Bill 716, passed in October 2023 and effective January 1, 2024, extends balance billing protections to ground ambulance services in California. Before AB 716, ground ambulance providers were excluded from AB 72’s balance billing restrictions. Out-of-network ambulance providers were charging patients between $1,000 and $2,000 per transport, far exceeding Medicare and Medi-Cal fee schedule rates.

AB 716 Core Protections

• Patient cost-sharing cap: Insured patients are responsible only for their in-network cost-sharing amount, even when the ambulance provider is out of network. Providers cannot bill beyond this amount.
• Collections restriction: Out-of-network ground ambulance providers must wait at least 12 months before taking any collection action, including credit reporting, for unpaid cost-sharing balances under Health and Safety Code §1797.233(2).
• Uninsured patient billing: Uninsured and self-pay patients cannot be billed more than the established Medicare or Medi-Cal fee-for-service rate, whichever is higher, per Health and Safety Code §1797.233.
• Insurer reimbursement requirement: Insurance companies must reimburse out-of-network ambulance providers at local government rates or the rate determined by state regulation, preventing underpayment disputes from flowing to patients.

Law 10. AB 2297 – Charity Care and Discount Payment Policy (2025)

Assembly Bill 2297, effective January 1, 2025, expands patient eligibility for charity care and discount payment programs at California hospitals and emergency physician practices. The law raises the income threshold for discount payment eligibility from 350% to 400% of the federal poverty level (FPL) and eliminates hospitals’ authority to consider patients’ monetary assets when determining charity care eligibility.

Key AB 2297 Provisions

• Expanded income threshold: Patients with incomes up to 400% of the FPL are eligible for hospital and emergency physician discount payment programs, up from the prior 350% threshold.
• Asset exclusion: Hospitals may no longer consider a patient’s monetary assets when evaluating charity care or discount payment eligibility. Health savings accounts (HSAs) remain a permitted consideration.
• No lien on real property: Hospitals and emergency physicians may not use liens on real property to collect unpaid bills from patients.
• No insurance prerequisite: Hospitals and emergency physicians may not require patients to apply for Medicare, Medi-Cal, or other government coverage before screening for discount payment eligibility.
• No timing-based denial: Providers may not deny charity care or discount payment eligibility based on the timing of a patient’s insurance application.

Law 11. Knox-Keene Health Care Service Plan Act

The Knox-Keene Health Care Service Plan Act of 1975 is California’s foundational law governing the operations of health maintenance organizations (HMOs) and managed care plans. The Act is administered by the California Department of Managed Health Care (DMHC) and sets minimum standards for how health plans contract with providers, process claims, and resolve billing disputes.

Knox-Keene directly affects billing operations because health plan contracts with providers must comply with its requirements, and the DMHC enforces the Act’s claims payment and dispute resolution rules. The Act works alongside AB 72 to limit patient cost-sharing obligations in emergency and non-emergency out-of-network situations.

Knox-Keene Billing Provisions

• Emergency services billing: Knox-Keene requires health plans to cover emergency services at in-network cost-sharing amounts regardless of the emergency provider’s network status, establishing California’s foundational balance billing protection for emergencies.
• Claims processing timelines: Health plans regulated under Knox-Keene must acknowledge receipt of claims within 15 working days and pay or deny complete claims within 30 working days for electronic submissions.
• Provider contract requirements: Knox-Keene plans must maintain adequate provider networks. Contracts between plans and providers must include specific reimbursement terms, dispute resolution procedures, and termination notice requirements.
• Grievance process: Patients who believe they were improperly billed or denied coverage can file a grievance with the DMHC. Plans must resolve standard grievances within 30 calendar days and urgent grievances within 3 business days.

Law 12. California Hospital Price Transparency Laws

California’s hospital price transparency requirements operate alongside federal CMS rules to ensure patients can access cost information before receiving care. Effective January 1, 2021, the federal CMS Price Transparency Rule requires hospitals to publish a machine-readable file of all standard charges and a consumer-friendly list of 300 shoppable services. California’s Health Care Access and Information (HCAI) department collects chargemaster data and hospital financial reports independently from CMS requirements.

Price Transparency Requirements for California Hospitals

• Chargemaster publication: California hospitals must submit chargemaster data to HCAI annually. The HCAI publishes this data publicly through its cost transparency portal at hcai.ca.gov.
• Written estimates for uninsured patients: Under AB 1045 (effective 2006), hospitals must provide written cost estimates to uninsured patients upon request. The estimate must cover expected charges for the requested service, information on charity care eligibility, and contact telephone numbers.
• Income-based billing limits: Under AB 774, hospitals may not bill uninsured patients with incomes below 350% of the FPL more than the reimbursement the hospital would receive from Medicare, Medi-Cal, or any other government-sponsored program for equivalent services.
• Good Faith Estimates (federal): The No Surprises Act requires providers to give Good Faith Estimates to uninsured and self-pay patients for scheduled services. Bills that exceed the estimate by $400 or more trigger patient dispute rights.
• Itemized billing rights: California patients have the right to request and receive an itemized billing statement from any provider. Hospitals must provide this statement within a reasonable timeframe upon patient request. This itemized billing requirement applies equally to dental providers billing in California under medical insurance.

Law 13. Affordable Care Act (ACA) – Billing Compliance and Ethics Program Requirements

The Affordable Care Act (ACA), enacted in 2010, requires providers who receive reimbursement from federally funded healthcare programs, including Medicare and Medicaid, to establish a formal compliance and ethics program. The Office of Inspector General (OIG) monitors compliance with HHS programs, and the ACA makes OIG compliance guidance the standard against which provider billing ethics programs are measured.

Seven Core ACA Compliance Program Components

The ACA requires providers to develop compliance programs that include 7 core elements as defined by the OIG:

• Written policies and procedures: Documented standards of conduct and billing policies specific to the provider’s operations and payer mix.

• Designated compliance officer: A named compliance officer with authority to investigate billing concerns and report directly to senior leadership.

• Effective training and education: Annual training for all billing and coding staff on applicable laws, payer requirements, and internal policies.

• Effective communication lines: Open channels, including anonymous hotlines for staff to report billing concerns without retaliation.

• Disciplinary standards: Defined consequences for compliance violations applied consistently across all staff levels.

• Auditing and monitoring: Regular internal audits of billing records, coding accuracy, and claim submission practices, with corrective action plans for identified errors.

• Prompt response to offenses: A defined investigation and remediation process for identified billing violations, including voluntary disclosure to CMS or OIG when appropriate.

Law 14. California Medical Practice Act – Foundational Billing Standards

The California Medical Practice Act of 1975 was the first law in California to establish formal guidelines for how medical providers must bill for services. The Act mandates the maintenance of accurate records for all services rendered and all billings submitted. It remains the foundational statute from which California’s medical billing compliance framework developed.

The Medical Practice Act requires California-licensed physicians to maintain complete and accurate medical records that support every billed service. Claims that cannot be substantiated by corresponding medical records are subject to denial, recoupment, and disciplinary action by the Medical Board of California.

Medical Practice Act Billing Requirements

• Accurate record maintenance: Providers must keep medical records that document the clinical basis for each billed service, including diagnosis, treatment plan, service date, and provider identity.
• Bill-record alignment: Every billed procedure code must correspond to documented clinical evidence in the patient’s medical record. Billing for services not documented constitutes fraud under California law.
• Fee transparency: Providers must inform patients of their fees before rendering non-emergency services when requested. Charges not disclosed in advance may be subject to dispute.
• OIG exclusion screening: The Medical Practice Act’s authority over physician conduct makes OIG exclusion screening mandatory. Billing for services rendered by an OIG-excluded provider results in claim denial and recoupment from all payers, including Medicare and Medi-Cal.

Law 15. Statute of Limitations for Medical Billing in California

The statute of limitations for medical billing in California determines how long a provider can legally pursue payment for services rendered. California Code of Civil Procedure §337 establishes a 4-year statute of limitations for written contracts, which covers most healthcare service agreements and signed patient financial responsibility forms. An oral agreement carries a 2-year statute of limitations under Code of Civil Procedure §339.

Statutes of Limitations by Claim Type

Claim Type	Statute of Limitations	Legal Authority
Written contract (signed financial agreement)	4 years from service date or last payment	CCP §337
Oral agreement	2 years from service date	CCP §339
Medicare overpayment recovery	3 years from date of original payment (standard) / 6 years for extended recovery	42 CFR §405.980
Medi-Cal fraud recovery	Up to 10 years for fraud-based recoupment actions	California Welfare and Institutions Code §14107
Workers’ compensation lien	5 years from date of service	CCR §10770.1

Statute of Limitations and Credit Reporting

The statute of limitations for billing is separate from credit reporting timelines. Under the federal Fair Credit Reporting Act (FCRA), most negative credit items can appear on credit reports for up to 7 years. California’s SB 1061 (effective January 1, 2025) now bans medical debt from appearing on credit reports entirely, making this distinction relevant only for non-medical debt governed by standard FCRA timelines.

Practical Implications for Billing Departments

• Providers must file civil actions before the applicable statute of limitations expires to preserve the right to collect unpaid balances through the court system.
• Accounts approaching the 4-year statute of limitations on written contracts should be reviewed and escalated before the deadline to preserve legal collection options.
• Medi-Cal and Medicare overpayment notices must be responded to promptly, as ignoring recoupment demands does not reset or toll the government’s recovery rights.

California Billing Laws Compliance Summary

The following table provides a consolidated reference of the 15 top California billing laws covered in this guide, organized by effective date and primary compliance obligation.

Law	Effective Date	Primary Obligation	Governing Body
AB 72 – Balance Billing	January 1, 2017	Limit OON billing to in-network cost-sharing	DMHC / CDI
SB 1061 – Medical Debt Reporting	January 1, 2025	Prohibit reporting medical debt to CRAs	DFPI / AG Office
HIPAA	April 14, 2003	Protect PHI in billing and claims operations	HHS / OCR
CMIA	1981 (various amendments)	Written authorization before medical info disclosure	California AG
Prompt Payment Laws	Ongoing	Claim filing and payer payment deadlines	DMHC / DHCS / DWC
Medi-Cal Billing Regulations	Ongoing	Enrollment, authorization, coding for Medi-Cal	DHCS
Workers’ Comp Billing (Labor Code §4603.2)	Ongoing	45-day payment deadline; OMFS rates; IBR process	DWC
No Surprises Act (Federal)	January 1, 2022	Limit balance billing for self-insured ERISA plans	CMS / HHS
AB 716 – Ground Ambulance	January 1, 2024	Cap OON ambulance billing at in-network cost-sharing	DMHC
AB 2297 – Charity Care	January 1, 2025	Expand discount eligibility to 400% FPL	HCAI / DHCS
Knox-Keene Act	1975 (ongoing)	Health plan contract and claims payment standards	DMHC
Price Transparency Laws	January 1, 2021 (federal)	Publish chargemaster; provide cost estimates	CMS / HCAI
ACA Compliance Programs	2010 (ongoing)	7-component compliance and ethics program	OIG / HHS
Medical Practice Act	1975 (ongoing)	Accurate records for all billed services	Medical Board of CA
Statute of Limitations	Ongoing	4-year window for written contract collections	California Courts

California billing laws form a layered compliance system where federal baselines are consistently exceeded by state-specific protections. Providers who maintain active awareness of timely filing deadlines, patient disclosure requirements, and new legislation such as SB 1061 and AB 2297 protect their revenue cycle from denials.