Highmark Blue Cross Blue Shield Insurance Appeal Guide
A complete reference for behavioral health therapists appealing a Highmark Blue Cross Blue Shield denial. Every common CARC code, the correct appeal address, MHPAEA parity arguments, and response deadlines — all in one place.
Highmark Blue Cross Blue Shield appeal details
P.O. Box 890196
Camp Hill, PA 17089
Highmark operates in PA, WV, DE, NY. Pennsylvania Act 106 sets minimum alcohol and substance use treatment benefits for fully-insured large and small group plans; it does not apply to individual plans or self-funded coverage. Self-funded ERISA plans fall under federal MHPAEA only.
Most common Highmark Blue Cross Blue Shield denial codes
All Highmark Blue Cross Blue Shield denial code appeal guides
Select a code to see the denial explanation, appeal strategy, MHPAEA arguments, and a direct link to generate your appeal letter.
| Code | Denial reason | Guide |
|---|---|---|
| CO-4 | Modifier Inconsistent with Procedure | Appeal guide → |
| CO-11 | Diagnosis Inconsistent with Procedure | Appeal guide → |
| CO-15 | Authorization Number Missing or Invalid | Appeal guide → |
| CO-16 | Missing or Incomplete Information | Appeal guide → |
| CO-18 | Duplicate Claim | Appeal guide → |
| CO-22 | Coordination of Benefits | Appeal guide → |
| CO-29 | Timely Filing Limit Expired | Appeal guide → |
| CO-45 | Charge Exceeds Fee Schedule | Appeal guide → |
| CO-50 | Not Medically Necessary | Appeal guide → |
| CO-96 | Non-Covered Charges | Appeal guide → |
| CO-97 | Bundled / Already Adjudicated | Appeal guide → |
| CO-119 | Benefit Maximum Reached | Appeal guide → |
| CO-167 | Diagnosis Not Covered | Appeal guide → |
| CO-197 | Precertification / Authorization Absent | Appeal guide → |
| OA-23 | Prior Payer Adjustment (Coordination of Benefits) | Appeal guide → |
Frequently asked questions — Highmark Blue Cross Blue Shield appeals
- How long does Highmark Blue Cross Blue Shield have to respond to a Level-1 appeal?
- Highmark Blue Cross Blue Shield has 30 calendar days to respond to a Level-1 appeal. Your state's prompt-payment statute may impose a shorter window — verify before filing.
- How do I submit an appeal to Highmark Blue Cross Blue Shield?
- The fastest route is the Highmark Blue Cross Blue Shield provider portal. You can also fax appeals to 1-888-259-5952. Written appeals may be mailed to: Highmark Appeals Department, P.O. Box 890196, Camp Hill, PA 17089. Use certified mail with return receipt for any paper submission.
- What is Highmark Blue Cross Blue Shield's MHPAEA mental-health parity posture?
- Highmark operates in PA, WV, DE, NY. Pennsylvania Act 106 sets minimum alcohol and substance use treatment benefits for fully-insured large and small group plans; it does not apply to individual plans or self-funded coverage. Self-funded ERISA plans fall under federal MHPAEA only.
- What are the most common Highmark Blue Cross Blue Shield denial codes for behavioral health?
- The most common Highmark Blue Cross Blue Shield denial codes for behavioral health practices are: CO-4, CO-97, CO-119, CO-167. Select any code in the table above for the denial explanation, appeal strategy, and MHPAEA arguments.
- What should I include in a Highmark Blue Cross Blue Shield behavioral health appeal letter?
- A strong appeal should include: (1) the specific CARC or RARC denial code and reason for dispute; (2) clinical documentation supporting medical necessity; (3) a MHPAEA parity argument if the denial applies stricter criteria to mental health than to comparable medical services; (4) a written request for Highmark Blue Cross Blue Shield's NQTL comparative analysis under CAA 2021 § 203; and (5) your NPI, patient member ID, claim number, and date of service. AppealWin generates a complete, MHPAEA-grounded letter from your denial code in minutes.
Generate your Highmark Blue Cross Blue Shield appeal letter
AppealWin turns your denial code into a complete, MHPAEA-grounded appeal letter in minutes. Therapists get 5 free letters every month; a one-time $19 patient letter is also available. No credit card required.
Generate my appeal letter →State-specific appeal rights
State prompt-payment windows and parity laws can strengthen your Highmark Blue Cross Blue Shield appeal. Select your state to see applicable statutes.
View all 50 states + DC →