Disclosure: Fastora Medical Billing Solutions publishes this guide, and Fastora is one of the companies included in it. We placed ourselves first and we are saying so plainly — judge us by the same criteria as every other company below. No company paid to be listed, and no outside organization produced or endorsed this comparison.
California billing has a layer most states do not: Medi-Cal, the state’s Medicaid program, administered by the Department of Health Care Services (DHCS). Under Medi-Cal, behavioral health services are split between Medi-Cal managed care plans and county mental health plans — which payer is responsible depends on the type of service billed, so the same patient can generate claims belonging with two different payers. Add the large IPA and capitated arrangements in the major metros, and California rewards partners who understand routing, not just claim submission.
This guide compares seven medical billing companies that California practices genuinely consider, what each is built for, and where each fits best. For the service-side view, our page on Fastora’s medical billing services in California covers how we handle California billing, and our hub shows our medical billing coverage across the United States.
How we evaluated these companies
Each company below was assessed against the same six criteria, using information from the companies’ own published materials:
- Scope of service — does the engagement stop at claim submission, or cover eligibility, prior authorizations, denial management, A/R follow-up, and payment posting?
- California payer knowledge — is there evidence the company works with Medi-Cal (managed care plans and the county mental health plan split), California HMOs, and major commercial payers?
- Specialty coverage — how well does the company handle rule-heavy California specialties, including behavioral health, psychiatry, and ABA therapy?
- Pricing transparency — is pricing published, or quote-only? Is the model percentage-based, flat fee, per-FTE, or subscription?
- Onboarding and switching effort — how much transition work falls on the practice?
- Reporting and visibility — can the practice see claim status, denial reasons, and A/R aging without asking?
The seven companies at a glance
| # | Company | Best for | Type |
|---|---|---|---|
| 1 | Fastora Medical Billing Solutions | California practices that want a service team to work the whole revenue cycle, including Medi-Cal | Billing service / RCM |
| 2 | California Medical Billing | Practices that want a California-only, US-based billing specialist | Billing service |
| 3 | My RCM Group | Small to multi-specialty practices that want customizable RCM plus virtual staffing | Billing service / RCM |
| 4 | eClaim Solution | Small and mid-size practices that want full-service billing and a free audit first | Billing service |
| 5 | BillingParadise | Practices that want EHR-specific billing teams with published per-FTE pricing | Billing service / RCM |
| 6 | CareMSO | Practices that want billing, coding, and practice management in one platform | Platform + services |
| 7 | Transcure | Multi-specialty groups that want automation-led billing at scale | Billing service / RCM |
1. Fastora Medical Billing Solutions
Fastora is a service-led billing and revenue cycle company, and our California work is organized around the routing questions this state creates: is this Medi-Cal claim owed by the managed care plan or by the county mental health plan? Is the provider correctly enrolled for the plan being billed? Our team runs the cycle end to end — eligibility verification, prior authorizations, claim submission with a pre-submission review, denial management and appeals, payment posting, and follow-up on aged accounts, including a dedicated old A/R recovery service.
Why we placed ourselves first: most practices that come to us do not have a billing manager, and platform-led options still expect someone in the office to work queues, watch denials, and chase payers. Our model removes that assumption — the work itself is handed over, not just the software for doing it. Fastora reports more than 5 years in medical billing and RCM, experience supporting 100+ physicians, and 50+ active clients. We also handle provider credentialing and enrollment, which matters in California, where Medi-Cal enrollment and plan participation determine whether claims pay at all. Our specialty depth includes dedicated coverage of psychiatry billing services in California and behavioral health billing — where the plan-versus-county split bites hardest.
Pricing: Fastora charges either a percentage of collections or a flat monthly fee, set after a free billing assessment — both models are explained on our pricing page. There is no published rate card, which is normal for service-led billing, but the model is stated up front.
Best fit: solo and small-group practices, behavioral health, psychiatry, ABA, and therapy practices, and any California practice whose problem is workload and follow-through rather than software.
Getting started: Fastora offers a free initial billing audit before any contract, so a practice can see its claims, denials, and A/R before deciding.
2. California Medical Billing
California Medical Billing (California Medical Billing & Revenue Management) is a California-only billing company based in Rancho Cucamonga, with a support team the company states is 100% US-based. Its entire practice is California insurance billing and collections: it publishes specific experience with California HMOs, California Medicare, and California Medi-Cal rules, and it offers its services in packaged tiers as well as stand-alone services for practices that only need part of the cycle handled. The company emphasizes transparency, giving clients access to their billing accounts and detailed reports.
Strengths: single-state focus, in-state presence, and packages that let a practice buy only the pieces it needs. Considerations: a California-only specialist is a deliberate trade — multi-state groups will outgrow it, and practices should confirm how denial management and A/R follow-up are staffed within each tier.
3. My RCM Group
My RCM Group is a California-based revenue cycle company (offices in the San Dimas / Chino area of Southern California) offering a full-service menu: an initial practice consultation and revenue cycle audit, physician credentialing, medical billing and collections, payment posting and adjustments, accounts receivable management, and virtual staffing. Its published materials target small to multi-specialty practices and emphasize customizable support rather than a fixed package.
Strengths: breadth in one engagement — billing plus credentialing plus virtual staffing — with customized service design. Considerations: pricing is provided on consultation rather than published, so get the scope in writing; and because the firm is smaller than the national names here, larger groups should confirm capacity for their volume.
4. eClaim Solution
eClaim Solution is a full-service billing company with more than a decade in the field, serving small clinics and mid-size practices in California and beyond. Its published services include automated eligibility verification, claim submission, coding across CPT, ICD-10, and HCPCS code sets, denial management, credentialing support, and a free medical billing audit.
Strengths: a complete service menu at small-practice scale, and a free audit before committing. Considerations: confirm which parts of the menu are standard versus add-ons, and ask how Medi-Cal managed care claims — and behavioral health routing to county plans — are handled for California clients.
5. BillingParadise
BillingParadise is a large billing service whose distinguishing feature is how it organizes its teams: by EHR system and by specialty. Its published services cover the full cycle — charge entry, claim submission and scrubbing, payment posting, patient billing, denial management, A/R follow-up, eligibility verification, coding, and credentialing — across more than 40 specialties, including behavioral health, ABA therapy, and physical therapy. It works inside the practice’s existing EHR (with dedicated teams for systems such as Epic, Cerner, eClinicalWorks, and Tebra/Kareo) and publishes per-FTE monthly pricing for its staffing-based model — a level of price transparency few service companies match.
Strengths: published pricing, EHR-specific teams, and a free pre-onboarding billing audit. Considerations: a per-FTE model prices people, not outcomes — confirm which roles your fee covers, how work is supervised, and how Medi-Cal claims are routed in their workflow.
6. CareMSO
CareMSO is a California-focused billing and practice management provider that combines billing, coding, reporting, and practice management in a single platform, with integration into a practice’s existing EHR. Its published materials emphasize accurate claim submission, faster reimbursement, and scalability across practice sizes and specialties, and it has offered free credentialing at sign-up as part of onboarding.
Strengths: an all-in-one platform-plus-services approach aimed at the California market, with credentialing folded into onboarding. Considerations: confirm how much day-to-day denial and A/R work the service team performs versus what remains with your staff.
7. Transcure
Transcure is a large, automation-led billing company, founded in 2002, that provides end-to-end revenue cycle services — eligibility, prior authorizations, coding, claim submission, denial management, and A/R follow-up — across more than 40 specialties, and it features in published California state comparisons. It works with dozens of EHR systems and also offers credentialing.
Strengths: scale, a broad specialty bench, and a workflow built around automation. Considerations for California practices: automation delivers the most at higher volumes; smaller practices should confirm who reviews exceptions personally, and how the company handles the Medi-Cal behavioral health split between plans and county plans.
How to choose the right company for your California practice
Start with the California-specific questions, because they eliminate more vendors than any feature checklist. Ask every company on your shortlist: For a Medi-Cal behavioral health claim, how do you decide whether it goes to the managed care plan or the county mental health plan? How do you keep provider enrollment current with Medi-Cal and our plans? Who works a denied claim, and how fast? Our full guide on how to choose a medical billing company walks through the general evaluation step by step.
Then match the model to your actual problem. If claims go out but denials sit unworked and A/R ages, your problem is follow-through, and a service-led company matters more than new software. If your staff is capable and your tools are the bottleneck, a platform-led option like CareMSO may be the better buy. Either way, get the contract terms in writing: term length, exit terms, and data ownership if you leave.
Frequently asked questions
How much do medical billing companies charge in California?
Service-led companies usually charge a percentage of collections or a flat monthly fee; some, like BillingParadise, publish per-FTE monthly pricing; platform companies usually charge a per-provider subscription. Rates vary widely with specialty, volume, and scope, which is why most service companies quote after reviewing the practice. What matters is what the price includes — a lower price excluding denial follow-up and credentialing can cost more in lost revenue than a fuller-service quote.
What makes Medi-Cal billing different from other Medicaid programs?
Medi-Cal is administered by the California Department of Health Care Services (DHCS), and most members receive care through managed care plans. The feature that catches practices out is behavioral health: those services are split between Medi-Cal managed care plans and county mental health plans, and which payer pays depends on the type of service. A claim sent to the wrong one denies — so a California billing partner needs a routing workflow, not just a scrubber.
Does a California practice need a California-based billing company?
Not necessarily. California Medical Billing and My RCM Group are California-based specialists, and that focus has real value. But a national service-led company that can show you its Medi-Cal workflow — plan versus county routing, enrollment upkeep, plan rules — can do the job as well. Judge the workflow, not the ZIP.
Can a California practice switch billing companies without disrupting cash flow?
Yes, if the transition is planned: run the new biller in parallel briefly, confirm payer enrollments and EDI connections before the cutover, and make sure someone owns the old A/R — worked by the outgoing biller to a defined end date or transferred with a written inventory. Most cash-flow damage during switches comes from unowned old accounts, not the switch itself.
Do these companies work with my EHR?
Platform companies (CareMSO) integrate billing with their own practice management system. Service-led companies (Fastora, California Medical Billing, My RCM Group, eClaim Solution, BillingParadise, Transcure) typically work through your existing EHR and clearinghouse — BillingParadise even organizes teams by EHR system. Confirm compatibility with your system before signing either way.
What specialties do California billing companies cover?
Most cover primary care and common specialties. Where companies differ is depth in rule-heavy areas — behavioral health, psychiatry, ABA, and rehabilitation therapies, all high-volume in California and all carrying authorization, unit-based, and (under Medi-Cal) payer-routing rules. Ask for the workflow in your specialty, not a specialty count.
Conclusion
For a California practice, the best medical billing company is the one that understands this state’s payer routing — above all the Medi-Cal split between managed care plans and county mental health plans — and whose model matches your actual bottleneck. Specialists like California Medical Billing and My RCM Group offer in-state focus; platforms like CareMSO put tools in your office; service-led companies like Fastora take the work itself off your office.
Looking for a more reliable billing partner in California? Fastora provides medical billing and revenue cycle management support for eligible healthcare practices. Request your free initial billing audit to discuss your practice’s billing workflow and identify areas for improvement.
Sources: company descriptions are drawn from each company’s own published materials (California Medical Billing, My RCM Group, eClaim Solution, BillingParadise, CareMSO, Transcure), reviewed October 2026. Medi-Cal facts: DHCS, per Fastora’s state research, verified 2026-10-23. Fastora figures are company-reported.
