IRF Admission denied for missing prior authorization by UnitedHealthcare?

UnitedHealthcare's specific coverage criteria for irf admission are defined in its own published medical/coverage policy and the FDA-approved prescribing label. A successful appeal documents that your medical records satisfy each criterion those sources list — confirmed diagnosis, any required prior treatments (with dates and outcomes), and clinical severity. If the exact criteria weren't included with your denial, request them in writing; your appeal then maps each requirement to the matching fact in your chart.

## Why UHC Denied IRF Admission for Lack of Prior Authorization — and How to Appeal

UnitedHealthcare requires prior authorization (PA) for Inpatient Rehabilitation Facility (IRF) admissions. A denial on prior-auth grounds typically means either that: (a) authorization was not obtained before admission, (b) the authorization request was submitted but did not include sufficient clinical documentation, or (c) the authorization was obtained but the claim was processed against the wrong authorization number. Each scenario has a distinct appeal path, and all are recoverable.

## Federal Appeal Rights

A prior-authorization denial is an adverse benefit determination under federal law. Under ACA §2719, you have the right to an internal appeal and then an independent external review. Under ERISA §503 (for employer-sponsored plans), you are entitled to a full-and-fair review with access to the criteria applied. The external review window is typically 4 months from the final internal denial. If the patient is currently hospitalized and IRF transfer is imminent, request expedited internal review — UHC is required to respond within 72 hours for urgent inpatient decisions.

## Concrete Appeal Steps

1. Determine which prior-auth scenario applies: (a) no PA was requested — argue retrospective authorization or a clinical exception; (b) PA was requested but denied for insufficient documentation — submit a complete documentation package; (c) PA exists but the claim was mislinked — escalate to UHC's provider relations as an administrative correction. 2. Obtain UHC's IRF coverage policy and the InterQual or MCG clinical criteria used for IRF PA decisions — you are entitled to these under ERISA §503. 3. File the appropriate internal appeal with the documentation package below. 4. If denied internally, file for external review immediately.

## Documentation to Gather

• Physician certification: The admitting physiatrist or attending physician's order and certification that the patient requires and can tolerate intensive, multi-disciplinary inpatient rehabilitation — this is the threshold requirement for IRF PA approval.
• Functional assessments: Quantified therapy evaluations from physical, occupational, and speech-language pathology documenting the deficits requiring IRF-level intervention and the functional goals.
• Acute hospitalization records: Discharge summary establishing the clinical event, medical complexity, and the transition of care rationale.
• Prior authorization records: Copies of any PA request submitted, the date submitted, any reference numbers, and any UHC response — to establish a timeline and rebut claims that no PA was sought.
• Prescriber medical-necessity letter: Addressing each criterion in UHC's IRF coverage policy and explaining why the patient meets IRF-level criteria rather than a lower post-acute level.

## Criteria-Mapping Structure

Obtain UHC's IRF prior-authorization criteria and map each requirement to the specific chart documentation. For retrospective-authorization appeals, include a timeline showing the urgency of the clinical situation that made advance PA impracticable, alongside evidence that all clinical criteria were met at the time of admission. This combination of procedural and clinical documentation gives the appeal the strongest possible foundation.