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Medical billing by state

Medical Billing Services in California

California has the largest physician workforce in the country and one of the most complicated payer landscapes. Medi-Cal — the biggest Medicaid program in the US — runs nearly all members through managed care plans that differ county by county, and its fee-for-service billing limit is 6 months, extendable to 12 only with a valid delay reason code. On the commercial side, California is unusual: Anthem Blue Cross and Blue Shield of California are two separate, competing companies, Kaiser Permanente dominates entire regions with its closed model, and claims settlement is policed under two different regulators depending on the product. Billing here rewards teams that know which rulebook applies to which card.

California billing at a glance
6 months
Medi-Cal billing limit — up to 12 months only with a delay reason code
2 regulators
DMHC governs most HMO/plan products; CDI governs traditional insurance
PAVE
Medi-Cal provider enrollment runs through DHCS's PAVE portal
County-based
Medi-Cal managed care plans and rules vary by county
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Medi-Cal: filing rules that decide whether you get paid

Administered by the California Department of Health Care Services (DHCS)

Medi-Cal fee-for-service claims carry a 6-month billing limit from the month of service; late claims are payable up to 12 months only with an approved delay reason code, and even then often at reduced reimbursement. The overwhelming majority of members sit in county-organized or commercial managed care plans — L.A. Care (the largest publicly operated health plan in the US), Health Net, Molina, IEHP, Kaiser and county health systems among them — each with its own filing windows and auth rules. Provider enrollment runs through the DHCS PAVE portal, and California is strict about enrollment categories and rendering-provider linkage.

Deadlines for every major payer — including California Medicaid — live in our timely filing limits tool, with an interactive deadline checker.

The payers we bill every day in California

Kaiser Permanente
Dominant integrated payer-provider across Northern and Southern California — out-of-network billing to Kaiser has its own rhythm entirely.
Blue Shield of California
Independent nonprofit Blue plan — not the same company as Anthem Blue Cross.
Anthem Blue Cross (Elevance)
The other California Blue — large PPO commercial book plus Medi-Cal managed care.
L.A. Care Health Plan
The largest publicly operated health plan in the US, serving Los Angeles County Medi-Cal.
Health Net (Centene) & Molina
Major Medi-Cal managed care and marketplace players across multiple counties.
IEHP (Inland Empire Health Plan)
County-organized plan covering Riverside and San Bernardino — one of the largest Medicaid plans in the nation.

California billing rules that move real money

AB 1455 claims settlement rules

California's claims settlement regulations require plans to acknowledge, process and pay or contest clean claims on fixed schedules, with interest owed on late payment. Which schedule applies depends on the regulator: most HMO and managed care products answer to the DMHC under the Knox-Keene Act, while traditional insurance products answer to the CDI. Working the wrong complaint channel wastes months.

AB 72 out-of-network protections

Since 2017, California has limited surprise billing for out-of-network non-emergency services at in-network facilities — pre-dating the federal No Surprises Act — with its own payment standard and dispute process that interacts with the federal rules.

Where we work in California

We support practices across the state remotely — same-day claim submission and a dedicated team regardless of your zip code. The markets we serve most:

Los Angeles
The largest single metro physician market in the US — heavy Medi-Cal managed care via L.A. Care and Health Net alongside entertainment-industry employer plans.
San Francisco Bay Area
High commercial rates, deep Kaiser penetration, and dense specialist and academic-affiliated group markets.
San Diego
Large military/TRICARE population alongside strong commercial and MA markets.
Sacramento
State-employee (CalPERS) coverage concentration and a growing multi-specialty market.
Fresno & the Central Valley
Some of the highest Medi-Cal mix in the state — margins live and die on clean Medi-Cal billing.

Credentialing & enrollment in California

Physician licensing in California runs through the Medical Board of California, and payer enrollment is its own workstream on top of it — state Medicaid enrollment, CAQH upkeep, and individual plan contracting each on their own timeline. Our credentialing service manages the full stack for California providers, and our credentialing calculator estimates realistic timelines by payer.

California billing FAQs

What is the Medi-Cal timely filing limit?

Six months from the month of service for fee-for-service claims. Claims between 6 and 12 months are payable only with a valid delay reason code and may be cut. Medi-Cal managed care plans set their own limits — check each plan's provider manual.

Why did my claim go to the wrong California regulator?

California splits oversight: the DMHC regulates most HMO and managed care products under the Knox-Keene Act, while the CDI regulates traditional insurance. Provider complaints and prompt-pay disputes must be filed with the regulator that governs that specific product — the member ID card usually tells you which.

Do you bill Kaiser Permanente as an out-of-network provider?

Yes. Kaiser's closed model means out-of-network claims (mostly emergency and authorized referrals) follow specific submission paths and reimbursement rules — we handle those alongside standard commercial billing.

Can you manage Medi-Cal enrollment through PAVE?

Yes — we prepare and track DHCS PAVE applications, revalidations and group affiliations, including the rendering-provider linkages Medi-Cal is strict about, as part of credentialing.

Medical billing services in other states

Texas Florida New York Pennsylvania Ohio Illinois Georgia North Carolina Michigan New Jersey Virginia Washington Arizona Tennessee Massachusetts Indiana Missouri Maryland Wisconsin All states →

Ready to stop losing revenue in California?

Get a free billing audit — we'll review your denials, aging and payer mix against California-specific benchmarks and show you exactly where the money is leaking.

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