APIs for Developers
The Interoperability and Patient Access rule (CMS-0115-F) defines requirements for free and secure data flow that allows patients access to their health information. Working with our partners, Contra Costa Health has created service endpoints to meet these requirements through the Patient Access API and Provider Directory API described below.
| Data Type |
FIHR Base URL | API Documentation |
| Clinical Data, Medical Claims | https://epicproxy.et0421.epichosted.com/ APIProxyPRD/api/fhir/r4/metadata |
https://fhir.epic.com/ |
Patient Access API
The Patient Access API is an HL7 FHIR-based API. To begin developing applications that leverage this API start by reviewing the CMS standards used to make the data available.
Contra Costa Health allows patients to access their clinical and claims data via industry standard FHIR APIs. A step by step guide to connecting with Contra Costa Health's Epic system via API is available here. open.epic :: Developer Resources
Provider Directory API
The Provider Directory API is publicly available and does not require application registration or authentication.
Machine Readable Files – Transparency in Coverage
Contra Costa Health Plan members may visit our Transparency in Coverage page to access publicly available machine-readable files as required by the Transparency in Coverage Final Rule.
Contra Costa Health Plan - Prior Authorization Metrics for Medical Items and Services (Excluding Drugs)
Reporting Period: Calendar Year 2025
Line of Business: CCHP Medi-Cal
Run Date: End of Day 02/09/2026
Standard (Non-Urgent) Prior Authorization Requests
| Measure | How Many Times This Happened | Out of Total Requests | Percentage |
| Request Approved | 51,203 | 61,899 | 82.72% |
| Request Denied | 6,741 | 61,899 | 10.89% |
| Request Approved After Appeal* | 118 | 61,899 | 0.19% |
| Timeframe Extended & Approved | 2,087 | 69,575 | 3% |
* Subset of total standard requests appealed.
** Per CMS extension rules under 42 CFR 422.568(b)(2).
Expedited (Urgent) Prior Authorization Requests (Response Due Within 72 Hours)
| Measure | How Many Times This Happened | Out of Total Requests | Percentage |
| Request Approved | 6,167 | 7,676 | 80.34% |
| Request Denied | 885 | 7,676 | 11.53% |
Time Between Receiving a Prior Authorization Request and Sending a Decision
| Request Type | Mean (Average) Time (Days) | Median (Middle) Time (Days) |
| Standard (Non-Urgent) | 3.75 | 1.88 |
| Expedited (Urgent) | 2.08 | .71 |
Footnote — Urgent Prior Authorization Turnaround Time (2025)
Contra Costa Health Plan (CCHP) has identified a configuration issue that affected calculations for urgent prior authorization turnaround times for calendar year 2025. The defect resulted in an overstated urgent TAT average.
CCHP is implementing a systems fix in 2026 to correct the calculation and validate affected records in order to publish corrected metric. This note applies only to the Urgent TAT metric for 2025.