California practices bill into one of the most complex Medicaid environments in the country. Medi-Cal covers roughly a third of the state’s population, most of it through managed care plans, and the fee-for-service timely filing clock is one of the tighter ones nationally: original claims must reach the fiscal intermediary within six months following the month of service.
Medical Billing Services Group supports California practices remotely — no branch office, no in-person visits, just a US-based billing team that works inside your existing systems. We serve practices in all 50 states from a single remote operation, which means California’s Medi-Cal rules get dedicated attention in your payer matrix rather than being treated like every other state’s Medicaid.
Medi-Cal billing essentials
Medi-Cal is California’s Medicaid program, administered by the Department of Health Care Services (DHCS). Two facts shape every California billing workflow:
The six-month billing limit. For Medi-Cal fee-for-service, original claims must be received within six months following the month in which services were rendered. Miss it and the claim is denied for timeliness — and timeliness denials are among the hardest to overturn, since the limit is statutory rather than contractual.
Managed care dominates. The majority of Medi-Cal beneficiaries are enrolled in managed care plans, and each plan sets its own claims submission rules within state requirements. Some plans apply payment reductions for late claims rather than outright denials, but the practical effect is the same: revenue leaks when filing discipline slips.
One more California-specific wrinkle: specialty mental health Medi-Cal claims run on a different clock — 12 months from the month of service, with Delay Reason Codes available for qualifying exceptions. If your practice bills both medical and behavioral health services in California, you are running two timely filing calendars, not one.
Where California practices lose revenue
Managed care plan variation. With dozens of Medi-Cal managed care plans operating across counties, each with its own timely filing, corrected-claim, and appeal rules, a single “California workflow” doesn’t exist. Practices that bill five plans with five different calendars need a payer matrix, not a memory.
Crossover and coordination-of-benefits complexity. California’s large dual-eligible population means Medicare crossover claims and Medi-Cal secondary claims are routine. Secondary filing clocks typically run from the primary payer’s remittance date, not the date of service — a second deadline your team has to track per claim.
Eligibility churn. Medi-Cal redeterminations create retroactive eligibility spans. Claims that looked self-pay at the visit can become billable to Medi-Cal months later, which means your A/R team needs a process for re-checking eligibility on aged balances rather than writing them off.
Authorization requirements. Managed care plans layer prior authorization rules on top of Medi-Cal coverage policy. Denials for “no authorization on file” are a California staple, and they are preventable only if eligibility and authorization are verified before the visit — see our eligibility verification and prior authorization services.
How MBSG supports California practices
We provide full medical billing services and revenue cycle management for California practices, including:
- Medi-Cal and managed care claims submission — clean claims built to each plan’s companion guide, tracked against plan-specific timely filing calendars.
- Denial management — root-cause analysis on Medi-Cal and commercial denials, with appeal and corrected-claim workflows that respect each payer’s resubmission rules.
- Eligibility verification and prior authorization — front-end checks that prevent the authorization denials California plans issue most.
- Credentialing and payer enrollment — Medi-Cal and plan enrollment, revalidation, and NPI linkage so claims don’t deny for provider eligibility.
- Medical billing audits — coding and documentation reviews that catch the errors behind California’s most common denials.
- Clearinghouse connectivity — electronic claim routing with acceptance reporting, so you have proof of timely filing if a deadline is ever disputed.
For smaller California practices, our small-practice billing support packages the same discipline without the overhead of an in-house billing department. Practices considering a change can compare outsourced medical billing against in-house costs.
Specialties we serve in California
Our billing workflows adapt to specialty-specific coding rules — including behavioral health, cardiology, gastroenterology, oncology, pediatrics, internal medicine, OB-GYN, orthopedic, and urology billing. Browse all specialties or review our full services lineup.
Get a Free Billing Audit.
If California denials, Medi-Cal backlogs, or managed care complexity are eating your margin, start with a Free Billing Audit. We review recent claims, map your denial patterns, and show you exactly where revenue is leaking — before you commit to anything.
Prefer to talk first? Call +1 (307) 396-4107 or email contact@medicalbillingservicesgroup.com. Pricing is quoted in your written proposal after we review your volume and payer mix — see medical billing pricing for how we scope engagements. Data is handled under our HIPAA safeguards and business associate agreement; details at HIPAA & security.
Frequently asked questions
How fast must Medi-Cal claims be filed in California?
For Medi-Cal fee-for-service, original claims must be received within six months following the month of service. Managed care plans set their own deadlines within state rules, so your actual calendar depends on the plan. Specialty mental health Medi-Cal claims allow 12 months. (Billing rules change; confirm against the current DHCS provider manual.)
Does MBSG have a California office?
No. We are a remote company serving all 50 states. California practices get a billing team that works inside your EHR and practice management system — no in-person visits, no branch overhead passed through to you.
Can you bill both Medi-Cal and commercial plans for our practice?
Yes. We manage multi-payer workflows including Medi-Cal fee-for-service, Medi-Cal managed care plans, Medicare, and commercial payers, with separate timely filing calendars and denial workflows per payer.
What happens to claims denied for timely filing?
Timely filing denials are rarely overturned, which is why prevention matters more than appeals. We track submission dates against every payer’s deadline and keep clearinghouse acceptance reports as proof of timely filing.
Do you handle Medi-Cal provider enrollment?
Yes — our credentialing and payer enrollment service covers Medi-Cal enrollment, plan contracting support, and revalidation tracking.
How do we start?
Get a Free Billing Audit. We review a sample of your recent claims and show you the denial patterns and missed revenue before you sign anything.
General educational information, not legal advice or a guarantee of reimbursement. Requirements vary by payer, plan, setting and date of service. Coding references last reviewed 2026-10-08.