California limits added billing barriers for Medi-Cal providers after other coverage pays

What happened

California approved and filed AB 1126 on September 14. For a Medi-Cal managed care enrollee with other coverage where Medi-Cal is payer of last resort, DHCS must ensure a noncontracted provider billing allowable costs unpaid by that coverage does not face administrative requirements significantly exceeding those for billing the same costs through fee-for-service Medi-Cal. A separate provision says a participating Medi-Cal fee-for-service provider need not join the managed care network simply to bill allowable covered costs, but this specific no-contract requirement excludes Medicare as the other coverage. The distinction matters when applying coordination-of-benefits procedures.

Plans may require a letter or similar agreement for prior-authorized services, services covered by the Medi-Cal plan but not the other coverage, and qualifying continuity-of-care or completion-of-services arrangements. Without an agreement, the provider may bear amounts above the allowable fee-for-service rate or service limits and may not bill the enrollee for the unpaid excess. DHCS must clarify billing conditions, may use letters or bulletins, and must update legislative health committees annually from 2027 through 2030. Implementation is expressly limited to necessary federal approvals and available federal financial participation that is not jeopardized. At this September coverage cutoff, the chapter text does not establish that those conditions have been met or set a separate January 1 implementation deadline.

Why it matters

Coordination-of-benefits edits must distinguish the general administrative limit from the narrower no-contract rule and preserve lawful agreement and beneficiary-billing safeguards.

Implementation playbook

1. Internal target: Map noncontracted-provider billing requirements after other coverage pays. Managed Care · Due 2026-10-16
2. Internal target: Identify edits or network requirements that exceed fee-for-service rules. Revenue Cycle · Due 2026-10-30
3. Internal target: Prepare implementation pending federal approval and funding. Compliance · Due 2026-11-13

Sources

• AB 1126, chaptered bill text and historyOfficial · California Legislature · 2026-09-15 · Source review 2026-09-20
• Official retained source documentOfficial · Official issuing agency · Source review 2026-10-16