Insurer Appeal Playbook
How to Appeal a UnitedHealthcare (Optum) Denial
UnitedHealthcare (Optum) denied 17% of standard prior-authorisation requests in calendar year 2025 and overturned 60% of those denials upon provider appeal (KFF analysis of CMS-0057-F insurer disclosures, August 2026).
Published Overturn Rate:
60%
PA Denial Rate: 17%
Verified: Quarter 3, 2026
UnitedHealthcare (Optum) Appeal Levels & Timely Filing Windows
Stage 01
Level 1 Reconsideration
Deadline: 180 days from initial remittance
Format: Electronic portal upload or Fax with PRA cover sheet
Stage 02
Level 2 Formal Appeal
Deadline: 60 days from Level 1 determination
Format: Formal written grievance with clinical records
Stage 03
External / State Review
Deadline: 120 days from final denial
Format: Independent Review Organization (IRO) filing
Winning Appeal Tactics for UnitedHealthcare (Optum)
Directly cite Optum Clinical Criteria Guidelines and Milliman Care Guidelines (MCG)
Include intraoperative findings when CPT differs from pre-cert
Reference CMS-0057-F statutory turnaround deadlines when payer delays review
Most Common UnitedHealthcare (Optum) Denial Triggers
01. CO-197 (Prior Auth)
02. CO-50 (Medical Necessity)
03. CO-97 (Bundling / Lab edit)
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