Medical Billing Services in California

California is the largest practice market in the country, and for many practices here, billing is where good medicine meets a wall of paperwork. A single practice can end up dealing with Medicare, a shelf of commercial plans, and Medi-Cal — California’s Medicaid program — each with its own authorization rules, claim requirements, and deadlines. Keeping all of that straight takes time most California practices do not have.

Fastora Medical Billing Solutions handles that work for practices across the state, from solo therapists to multi-location medical groups, as part of our medical billing services across the United States. This page explains what billing in California actually involves, where practices tend to lose money, and how we can take the workload off your team.

The billing problems California practices actually face

The first problem is sheer variety. Every payer a California practice contracts with applies its own rules for eligibility, referrals, prior authorization, and timely filing, and those rules change often enough that last year’s workflow quietly stops working. A claim that sails through one plan gets denied by another for a missing authorization or a coding detail nobody flagged. For practices billing several plans at once, staying current with each one is a job in itself.

The second problem is capacity. Many California practices run lean front offices, and billing is usually the task that slips when the phones ring and the waiting room fills. Claims go out late, denials sit untouched because nobody has time to work them, and accounts receivable ages a little more every month. None of this shows up as a single dramatic failure. It shows up as a slow, steady leak — services you delivered and documented that never turned into payment.

Medi-Cal adds a layer most states do not have

Medi-Cal is California’s Medicaid program, administered by the Department of Health Care Services (DHCS). It is a major payer for practices across the state, and it comes with its own enrollment, authorization, and claim requirements on top of everything commercial payers ask for.

Behavioral health is where California’s structure gets genuinely complicated. Under Medi-Cal, behavioral health services are split between two systems: many services are covered through Medi-Cal managed care plans, while specialty mental health services are handled through county mental health plans. Which side pays depends on the type of service being delivered. Send a claim to the wrong side and it comes back denied — not because the care was not covered, but because it was routed to the wrong payer. Practices that bill both physical and behavioral health in California have to get that routing right on every claim, which is why our behavioral health billing services treat the plan-versus-county question as the first check, not an afterthought.

Before any of that can pay, the practice also has to be enrolled correctly — with Medi-Cal and with each plan it intends to bill. Enrollment gaps, lapsed revalidations, and mismatched provider records are a quiet source of denials that no amount of claim follow-up will fix. Our credentialing and payer enrollment support keeps those records current so claims are not held up by paperwork problems upstream.

Medical billing and coding services under one roof

Clean claims start with accurate coding. A large share of denials trace back to the charge itself: a code that does not match the documentation, a missing modifier, timed therapy units recorded incorrectly, or a behavioral health service coded at the wrong level. Fastora’s coding review looks at charges before they go out, comparing what was documented with what is about to be billed, so errors are caught while they are still cheap to fix. When a payer does push back, corrected claims and reprocessing requests are part of the same workflow — your team is not handed a denial and left to sort it out. Handling billing and coding together is what practices usually mean when they search for medical billing and coding services in California, and it is how we structure the work.

What Fastora handles for California practices

We manage the full revenue cycle, or the parts of it your practice struggles with most:

• Claims submission and follow-up. Claims are prepared, scrubbed, and submitted electronically, then tracked until each one is resolved — not just sent.
• Denial management and appeals. Denials are worked by reason, corrected, and appealed where the documentation supports it, so recoverable revenue is not written off by default.
• Eligibility verification. Coverage and benefits are checked before the visit, which prevents the most avoidable denials and surprise patient balances.
• Prior authorization. Authorizations are requested and tracked so scheduled services are not delayed or denied for a missing approval.
• Accounts receivable recovery. Aged claims are reviewed, prioritized, and followed up systematically instead of aging out.
• Payment posting and reconciliation. Payments and ERAs/EOBs are posted and reconciled, which is also how underpayments get spotted — when a plan pays less than the contracted rate, you see it.

That experience runs 5+ years deep: Fastora supports 50+ active clients and has worked with 100+ satisfied MDs. California practices pay in one of two ways — a percentage of collections or a flat monthly fee — and the better fit usually turns on claim volume and the Medi-Cal share of the workload.

Specialties we support in California

Behavioral health, psychiatry, psychology, and counseling. California has one of the densest behavioral health practice communities in the country, and its billing carries the Medi-Cal routing problem described above plus the usual authorization and medical-necessity documentation demands. We bill for psychiatrists, psychologists, therapists, and counseling practices across payer types. If psychiatry is your focus, our page on psychiatry billing services in California goes deeper on the Medi-Cal split and what it means for psychiatric practices.

ABA therapy. California’s ABA providers handle high session volume, recurring authorizations, and detailed session documentation. Billing has to keep pace with all three, or claims stall. We support ABA practices with the authorization tracking and claim follow-up that high-volume schedules require.

Physical, occupational, and speech therapy. Therapy billing turns on units, modifiers, and plan visit limits, and small errors repeat across every visit on a caseload. We help therapy practices keep timed codes and documentation aligned so claims pay consistently.

Pain management. Procedure-heavy practices face authorization requirements and documentation scrutiny that general billing teams often underestimate. We handle the claim and appeal work for pain practices billing commercial plans, Medicare, and Medi-Cal.

Billing support across California

Los Angeles

Los Angeles holds an enormous range of practices — large specialty groups, behavioral health clinics, therapy practices, and thousands of independent offices — often billing very different payer mixes within the same building. The surrounding markets add their own volume: Orange County’s dense specialty and therapy community in Irvine, Anaheim, and beyond, and the fast-growing Inland Empire practices in Riverside and San Bernardino. We support practices across the greater Los Angeles region with billing that adapts to each practice’s payer mix rather than forcing one workflow on everyone.

San Diego

San Diego practices range from independent specialty offices to growing multi-provider groups serving communities across the county. Many run small administrative teams, which makes denial follow-up and A/R work the first things to slip. Fastora gives San Diego practices a full billing team behind them without the cost of building one in-house.

San Francisco and the Bay Area

The Bay Area has an unusually high concentration of psychiatry, psychology, and counseling practices, alongside academic-affiliated groups and specialty clinics. Behavioral health billing — including the Medi-Cal plan-versus-county routing — is a daily operational question here, and it is one we are set up to handle.

San Jose

San Jose and the wider Silicon Valley area support a dense suburban practice market: therapy, ABA, behavioral health, and family practices serving a heavily commercially insured patient base. High visit volume and employer-plan variety make eligibility verification and authorization tracking especially important, and both are built into our workflow.

Sacramento

As the state capital and a referral hub for the northern Central Valley, Sacramento mixes large health-system-adjacent groups with independent practices of every specialty. Practices here often bill a wide spread of commercial plans alongside Medi-Cal, and we manage that mix as one organized revenue cycle.

Fresno

Fresno anchors care for a large stretch of the Central Valley, where many practices operate with small teams and serve a substantial Medi-Cal patient population. For those practices, consistent claim follow-up and enrollment upkeep matter enormously, because there is no spare staff to absorb billing problems when they pile up.

Frequently asked questions

Do you bill Medi-Cal, or only commercial insurance?

Both. We bill Medi-Cal, Medicare, and commercial plans for California practices, and we handle the different requirements each payer carries — including the Medi-Cal behavioral health split between managed care plans and county mental health plans.

For a Medi-Cal patient, how do we know whether a behavioral health claim goes to the managed care plan or the county?

It depends on the service. Many behavioral health services are covered through the member’s Medi-Cal managed care plan, while specialty mental health services are handled through county mental health plans. Part of our intake and eligibility process is confirming the correct route before the claim is built, so it is not denied for being sent to the wrong payer.

How much do medical billing services cost in California?

We keep pricing to two models: a percentage of collections, or a flat monthly fee. For most California practices the deciding factors are monthly claim volume and how much of the Medi-Cal and commercial workload you want off your team’s plate. Start with the free billing audit — it gives you a clear read on your current billing before you choose either model.

Can you help with Medi-Cal enrollment and payer credentialing?

Yes. We support credentialing and enrollment with Medi-Cal and commercial payers, and we track revalidation and renewal dates so your enrollment does not lapse and interrupt payments.

We already have an in-house biller. Can you take over only part of the work?

Yes — partial engagements are common. Practices often keep routine claim submission with their own staff and hand us the work that needs dedicated follow-through: denial management and appeals, aged A/R recovery, eligibility verification, prior authorizations, or Medi-Cal enrollment upkeep. We define the split around your team’s capacity, and it can change as your needs do.

How do we switch billing companies without disrupting payments?

The safest switch is a planned overlap: claims in flight are inventoried, payer enrollments and EDI connections are confirmed under the new setup, and submission continues without a gap. We manage that transition with your team so cash flow is protected while billing moves over.

Start with a free billing audit

If your California practice is losing time or revenue to billing, the clearest next step is a free initial billing audit. We will review how your claims are performing, where denials and old A/R are costing you, and what it would take to fix them — no obligation. Request your free initial billing audit and we will take it from there.

If you are comparing providers in California, our guide to the best medical billing companies in California applies the same criteria to every company, including us.