UnitedHealthcare / Optum Insurance Appeal Guide
A complete reference for behavioral health therapists appealing a UnitedHealthcare / Optum denial. Every common CARC code, the correct appeal address, MHPAEA parity arguments, and response deadlines — all in one place.
UnitedHealthcare / Optum appeal details
P.O. Box 30432
Salt Lake City, UT 84130
30 calendar days
60 days from Level-1 denial
1-801-938-2100
UHC/Optum manages behavioral health in-house for most commercial products. Document the prior-authorization and medical-necessity criteria carefully and request the CAA 2021 § 203 NQTL comparative analysis in writing. (Note: the Wit v. United Behavioral Health litigation was substantially reversed by the Ninth Circuit in 2022–2023 and should not be cited as binding authority in an appeal.)
Most common UnitedHealthcare / Optum denial codes
All UnitedHealthcare / Optum 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 — UnitedHealthcare / Optum appeals
- How long does UnitedHealthcare / Optum have to respond to a Level-1 appeal?
- UnitedHealthcare / Optum has 30 calendar days to respond to a Level-1 appeal. If the internal appeal is denied, you have 60 days from that denial to request external review by an Independent Review Organization (IRO). Your state's prompt-payment statute may impose a shorter window — verify before filing.
- How do I submit an appeal to UnitedHealthcare / Optum?
- The fastest route is the UnitedHealthcare / Optum provider portal. You can also fax appeals to 1-801-938-2100. Written appeals may be mailed to: UnitedHealthcare Appeals, P.O. Box 30432, Salt Lake City, UT 84130. Use certified mail with return receipt for any paper submission.
- What is UnitedHealthcare / Optum's MHPAEA mental-health parity posture?
- UHC/Optum manages behavioral health in-house for most commercial products. Document the prior-authorization and medical-necessity criteria carefully and request the CAA 2021 § 203 NQTL comparative analysis in writing. (Note: the Wit v. United Behavioral Health litigation was substantially reversed by the Ninth Circuit in 2022–2023 and should not be cited as binding authority in an appeal.)
- What are the most common UnitedHealthcare / Optum denial codes for behavioral health?
- The most common UnitedHealthcare / Optum denial codes for behavioral health practices are: CO-97, CO-4, CO-50, CO-167. Select any code in the table above for the denial explanation, appeal strategy, and MHPAEA arguments.
- What should I include in a UnitedHealthcare / Optum 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 UnitedHealthcare / Optum'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 UnitedHealthcare / Optum 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 UnitedHealthcare / Optum appeal. Select your state to see applicable statutes.
View all 50 states + DC →