Medical Necessity · Washington

Appeal a Medical Necessity Denial in Washington

Washington's IRO external-review process under RCW 48.43.535 is administered by certified IROs and decisions are binding. Patients have 180 days to request external review.

When a Washington insurer denies care as not medically necessary, the appeal should identify the specific UM criterion the insurer applied (carriers must provide on request under WAC 284-43), establish how the patient meets the criterion (or how it conflicts with standard of care), and reference the OIC's certified-IRO process.

After internal appeal exhaustion, the IRO request goes through the insurer to a randomly-assigned, OIC-certified IRO. The IRO decision is binding. Standard timeframe is 15 days from IRO assignment; expedited is 72 hours.

Washington also has notable consumer-protection provisions, including the right to a same-specialty peer reviewer and OIC enforcement authority over chronic UM violators.

Statutes and resources cited

  • RCW 48.43.535 (Independent Review)
  • WAC 284-43 (Health Carrier Administration)
  • OIC Consumer Advocacy: 1-800-562-6900

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Frequently asked questions

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