How to check UnitedHealthcare claims against its 2026 policy updates
Check diagnosis code pairs, primary diagnoses, National Provider Identifiers (NPIs) and taxonomy codes, and each NPI's record in the federal registry.
Co-founder, JotPsych
Since March 1, 2026, UnitedHealthcare's commercial and Individual Exchange plans can deny your outpatient or professional claim for two diagnosis codes that ICD-10 says never to use together. The denial used to apply only to inpatient claims.
Each pair was checked against the Excludes 1 notes in the ICD-10-CM code set in effect October 1, 2026, and no Excludes 1 note bars an allowed pair. UnitedHealthcare publishes no pair list of its own, so check your most common pairs against the notes.
- Check your diagnosis pairs. ICD-10 puts an Excludes 1 note on some codes, and the note lists codes that “should never be used at the same time” as the code above the note. Single-episode and recurrent depression, F32.1 and F33.1, are one barred pair. Put F32.1 or F33.1 on your claim, not both. You can list F41.1 with F33.1.
- Check each primary diagnosis. Codes on UnitedHealthcare's Inappropriate Primary list can't be primary on your outpatient or professional claims for its commercial and Individual Exchange plans. The list includes F06.4, anxiety due to a known physical condition, and Z63.0, problems with a spouse or partner. On your professional claims, UnitedHealthcare denies only the line with a listed primary code.
- Put a billing NPI and a rendering NPI on every claim, each with its taxonomy code. Your taxonomy codes name each provider's specialty. UnitedHealthcare's guide covers its commercial, Individual Exchange, and Medicare Advantage plans. You “must submit a valid billing NPI, rendering NPI and relevant taxonomy code(s) on all claims and encounters,” the guide says.
- Check your NPIs in the federal registry. NPPES, the National Plan and Provider Enumeration System, is the federal registry that issues NPIs. Optum, UnitedHealthcare's behavioral health affiliate, plans to match your NPIs and taxonomy codes to NPPES on claims for commercial (employer-sponsored) plans. Look up each clinician's record in NPPES. Make sure your claims match the record.
Dates come from UnitedHealthcare's January 2026 bulletin and diagnosis code policy, and from Optum's September 2025 notice. Both UnitedHealthcare updates apply to the claims you send now.
In a September 2025 notice, Optum said that from October, your commercial claims without the rendering NPI and taxonomy code would get a reminder flag. Your 2025 claims could still be paid. The notice said Optum would tell you by the end of March 2026 when denials start. Optum's notices through August 2026 don't name a date.
JotPsych checks your billing NPI against NPPES the first time you verify your billing identity.
Book 15 minutes- UnitedHealthcare, Commercial Reimbursement Policy Update Bulletin, January 2026: Diagnosis Code Requirement Policy reminder, Excludes 1 enforced on all claim types, outpatient and professional included, from March 1, 2026.
- UnitedHealthcare, Diagnosis Code Requirement Policy, Professional and Facility, policy 2026R5034B, Commercial and Individual Exchange; history through September 20, 2026; read October 2, 2026.
- UnitedHealthcare, Inappropriate Primary ICD-10-CM Diagnosis Codes List, September 2026; read October 2, 2026.
- UnitedHealthcare, 2026 Care Provider Administrative Guide for Commercial, Individual Exchange and Medicare Advantage, effective April 1, 2026: NPI.
- Optum Provider Express, NPI requirements, Top of Mind, September 2025; read October 3, 2026.
- Optum Provider Express, Top of Mind, all news: the notices from September 2025 to August 2026; read October 3, 2026.
- Centers for Medicare & Medicaid Services (CMS), ICD-10-CM code set and guidelines, fiscal year 2027, in effect October 1, 2026.