California Claims Dispute & Statutory Guide
California workers' compensation medical treatment and billing are administered by the Department of Industrial Relations Division of Workers' Compensation (DWC). Disputes over medical billing amounts are strictly resolved through Second Review and Independent Bill Review (IBR) pursuant to Labor Code Section 4603.6.
Statutory Framework & Jurisdiction
Statutory no-fault workers' compensation system with employer Medical Provider Networks (MPNs) and standardized utilization review.
Official Medical Fee Schedule & Reimbursement Standards
name
Official Medical Fee Schedule (OMFS) - 8 CCR §§ 9789.10 - 9789.111
structure
RBRVS-based fee schedule updated annually with California-specific conversion factors for physician services, outpatient facilities, and inpatient hospitals.
electronic Billing
Mandatory e-billing compliance under California Labor Code Section 4603.4 and 8 CCR §§ 9792.5.0 - 9792.5.3
Preauthorization & Decision Point Review
protocol
Utilization Review (UR) governed by Labor Code § 4610. Providers submit DWC Form RFA (Request for Authorization).
deadlines
Prospective review decision must be communicated to the treating physician within 5 business days of receipt of complete clinical records.
dispute Mechanism
Independent Medical Review (IMR) through Maximus Federal Services (Labor Code § 4610.5)
Medical Billing & Appeals Procedure
timely Filing
12 months from the date of service (Labor Code § 4603.2(b)(2))
second Review
Mandatory prerequisite before IBR. Must be filed within 90 days of receipt of Explanation of Review (EOR) on DWC Form SBR-1.
independent Bill Review
Governed by Labor Code § 4603.6 and 8 CCR § 9792.5.4. Must be filed within 30 days of receipt of second review EOR with designated contractor (Maximus).
wcab Role
WCAB retains jurisdiction only over threshold legal liability issues (e.g., employment relationship, injury arising out of employment), not fee schedule calculations.
Critical Statutory & Dispute Deadlines
| Dispute Phase / Trigger Event | Statutory Timeline / Deadline |
|---|---|
| Initial Medical Bill Submission | 12 months from date of service |
| Payer Explanation of Review (EOR) | 45 days for paper bills; 15 days for compliant e-bills |
| Request for Second Review (SBR-1) | 90 calendar days from service of initial EOR |
| Payer Response to Second Review | 14 calendar days from receipt |
| IBR Application Filing | 30 calendar days from service of Second Review EOR |
Required Evidentiary Filing Checklist
- ✓Complete CMS-1500 / UB-04 form with standard WC modifiers
- ✓Treating physician Doctor's First Report of Occupational Injury (Form 5021) or PR-2/PR-4 progress reports
- ✓Approved Request for Authorization (RFA) with UR approval letter where applicable
- ✓Itemized statement of contested codes, OMFS fee calculations, and ground-rule justifications
- ✓Copy of original EOR and Second Review EOR
Official Primary Sources & Legislative Authorities
Official Forms & Downloads for California
CA DWC Form RFA Request For Authorization
Authorization Forms reference for California Workers' Compensation. Available for download.
California DWC Form IBR - Application for Independent Bill Review
Official application form to request Independent Bill Review (IBR) through Maximus for disputed workers' compensation medical treatment and service billing under California Labor Code Section 4603.6.
CA OMFS Official Medical Fee Schedule Summary
Fee Schedules reference for California Workers' Compensation. Available for download.
Governing Regulatory Authorities
Need Case Preparation Support in California?
Millennova Legal assists healthcare providers, revenue cycle teams, and law firms with comprehensive dispute documentation, arbitration filing bundles, and fee schedule calculations.
Request Dispute Consultation