Start with routing, not the headline law
California providers have to separate patient-protection rules from the payment-dispute route. A claim can be protected from balance billing and still require a separate decision about whether state law, federal IDR, a plan appeal, or no formal dispute process applies.
For commercial claims, the payer, plan type, service setting, and governing law usually matter before the offer strategy does.
Federal IDR payer mix in California
| Payer | Disputes | Provider win rate |
|---|---|---|
| Anthem Blue Cross | 28,487 | 89% |
| Aetna | 11,991 | 94.8% |
| Blue Shield of California | 8,531 | 77.2% |
| UnitedHealthcare | 6,333 | 86.1% |
| Cigna | 5,378 | 81.6% |
| Cigna / MultiPlan | 2,922 | 82.5% |
| UMR | 1,533 | 86.1% |
| UMR | 920 | 87.9% |
Top federal IDR service codes in California
| Code | Service | Disputes | Provider win rate |
|---|---|---|---|
| 99284 | Emergency department visit for the evaluation and management of a patient, which... | 16,033 | 89.2% |
| 99285 | Emergency department visit, high severity, requiring urgent evaluation | 14,432 | 89.2% |
| 85025 | Complete blood count (CBC) with automated differential | 6,521 | 85.7% |
| 36415 | Routine venipuncture (blood draw) | 5,894 | 89.1% |
| 99283 | Emergency department visit for the evaluation and management of a patient. Modifier 57... | 4,106 | 89.6% |
| 80048 | Basic metabolic panel (8 blood chemistry tests) | 3,757 | 85.4% |
| 93005 | Electrocardiogram (ECG) tracing only, without interpretation | 3,408 | 89.2% |
| 80053 | Comprehensive metabolic panel (14 blood chemistry tests) | 3,029 | 86% |
Provider workflow for California surprise-billing claims
- Confirm the plan type and whether state or federal rules control payment resolution.
- Identify protected emergency, facility-based, ancillary, or air-ambulance services.
- Preserve open-negotiation and federal IDR deadlines when the federal route applies.
- Benchmark any final offer against comparable payer, code, and state outcomes.
Open the California benchmark
Use the state benchmark to compare payer and code outcomes before escalating a dispute workflow.
FAQ
Does the No Surprises Act apply in California?
Yes, but claim routing depends on plan type, service setting, payer, and whether state law determines the payment-dispute route.
How many federal IDR disputes are in California?
The current CMS benchmark set includes 69,565 California federal IDR disputes.
What should providers check first in California?
Start with whether the claim is protected, whether state law or federal IDR controls payment resolution, and whether the filing deadline has been preserved.
Related guides
Sources and method
- CMS: Federal IDR reports and public use files
- CMS: About Independent Dispute Resolution
- California Department of Managed Health Care
- California Department of Insurance
This page uses CMS Federal IDR public use files through 2025Q4 and is for general information only. State-law routing and reimbursement rules can change; confirm current rules with counsel, the relevant regulator, and your compliance team.