2026 California Medi-Cal Behavioral Health Billing & Audit Readiness Manual

A beginner-friendly, step-by-step guide to understanding services, documentation, claims, reimbursement, and audit readiness

The 2026 California Medi-Cal Behavioral Health Billing & Audit Readiness Manual is a comprehensive digital resource designed to help behavioral health organizations understand what Medi-Cal billing requires, where billing activities occur, who is responsible, and how services move from delivery to reimbursement.

Developed by the Behavioral Health Training & Policy Institute (BHTPI), this 657-page manual translates complex California Medi-Cal requirements into clear operational guidance for professionals who may be new to Medi-Cal, behavioral health billing, or organizational compliance.

Rather than presenting billing as an isolated finance function, the manual connects eligibility, provider enrollment, service delivery, clinical documentation, diagnosis, coding, claims submission, payment reconciliation, denial management, quality assurance, and audit readiness.

Every section answers the essential questions

Each substantive section includes detailed guidance organized around:

• Who: The staff, practitioners, supervisors, reviewers, vendors, and external entities involved

• What: A plain-language explanation of the requirement, process, or billing term

• Where: The EHR, clearinghouse, county system, managed care portal, payer platform, documentation record, or internal work queue where the activity occurs

• When: The required timing, frequency, deadline, or triggering event

• Why: The connection to compliance, reimbursement, service integrity, and audit exposure

• How: Step-by-step instructions for completing, reviewing, documenting, and verifying the activity

What the manual covers

The manual provides practical guidance on:

• California Medi-Cal behavioral health delivery systems

• Medi-Cal fee-for-service and managed care

• County Mental Health Plans and Specialty Mental Health Services

• Drug Medi-Cal and DMC-ODS billing

• ECM and Community Supports billing pathways

• Provider enrollment, credentialing, contracting, and taxonomy

• Member eligibility and payer responsibility

• Referrals, authorizations, and service planning

• Behavioral health service delivery

• Medical necessity and supporting documentation

• ICD-10-CM behavioral health diagnoses

• CPT and HCPCS behavioral health codes

• Modifiers, place of service, time, and units

• CMS-1500, 837P, UB-04, and 837I claim concepts

• Short-Doyle/Medi-Cal and county-contracted-provider workflows

• EHR and practice-management systems

• California-capable clearinghouse considerations

• Electronic acknowledgments, including 999 and 277CA transactions

• Electronic remittance advice and 835 processing

• Reimbursement and rate validation

• Claim creation and pre-bill review

• Rejections, denials, corrected claims, voids, and appeals

• Accounts receivable and underpayment management

• Billing quality assurance

• Record-to-claim auditing

• Corrective and preventive action

• Recoupments and repayment exposure

• Audit-response management

• Privacy, security, and business continuity

• Technical assistance and continuous improvement

Practical instruction for new billers

The manual explains where to begin before entering a code or creating a claim. Readers learn how to:

1. Identify the member and responsible payer.

2. Verify eligibility for the date of service.

3. Confirm provider enrollment, credentials, taxonomy, and contract status.

4. Determine whether the service is covered and authorized.

5. Review the documentation supporting the service.

6. Select and validate claim information.

7. Submit the claim through the correct pathway.

8. Confirm claim-level acceptance.

9. Reconcile payment and remittance information.

10. Correct errors and retain audit evidence.

Built for implementation—not just reading

The manual includes:

• 52 structured chapters

• Detailed teaching and narration scripts

• Plain-language terminology

• California behavioral health examples

• Guided claim-processing procedures

• Operational workflows

• Risk and control reviews

• Technical-assistance questions

• Evidence-retention guidance

• Audit-readiness checkpoints

• Practice scenarios and rationales

• Source-control guidance

• Reference-maintenance tools

• Behavioral health billing glossary

Recommended for

• Community-based organizations entering Medi-Cal

• Behavioral health provider organizations

• County-contracted providers

• Mental health and substance-use programs

• Medi-Cal managed care network providers

• Billing and revenue-cycle staff

• Clinical and program teams

• Quality assurance and compliance professionals

• Finance and administrative personnel

• Executives and organizational leaders

• Consultants and technical-assistance providers

• EHR implementation and data teams

Digital product format

This product is delivered as a downloadable PDF for convenient electronic access and internal organizational use. It can be used for:

• Staff onboarding

• Billing-team training

• Leadership education

• Workflow development

• Policy and procedure review

• Internal quality assurance

• Technical-assistance engagements

• Pre-bill claim review

• Corrective-action planning

• Audit preparation

Important notice

This manual is an educational and operational resource. It does not constitute legal advice, coding advice for a specific claim, payer approval, or a guarantee of reimbursement. Medi-Cal requirements may vary by delivery system, county, managed care plan, program, provider type, contract, service, and date of service.

Users must confirm current requirements through applicable DHCS guidance, county and managed care plan manuals, contracts, companion guides, service tables, fee schedules, and licensed code sets before submitting claims.

The 2026 source framework was reviewed through August 1, 2026. Licensing and permitted organizational use depend on the license selected at purchase.

Digital download. No physical book will be shipped.