Prior authorization denials: how to appeal and what the new federal rule changes
Prior auth denials are the most common reason care gets blocked. Here is the appeal path, the federal rule that tightens turnaround times in 2026, and the leverage points that work.
Why prior auth denials happen
Prior authorization is a coverage check before the service. Most denials cite missing documentation, lack of step therapy, or the service not meeting the insurer's clinical policy criteria.
A prior-auth denial is appealable like any other adverse benefit determination under 29 CFR 2560.503-1 and 45 CFR 147.136.
The new federal turnaround standards
Under the CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F), most Medicare Advantage, Medicaid, CHIP, and qualified health plans on the federal marketplace must decide standard prior-auth requests within 7 calendar days and expedited requests within 72 hours, beginning January 1, 2026.
Plans must also include a specific reason for any denial. Source: https://www.cms.gov/newsroom/fact-sheets/cms-interoperability-and-prior-authorization-final-rule-cms-0057-f.
How to appeal effectively
Get the clinical policy bulletin the plan applied. ERISA plans must provide it free under 29 CFR 2560.503-1(h)(2)(iii).
Submit a letter of medical necessity that maps your records to each criterion. Cite specialty guidelines the bulletin itself references.
Request a peer-to-peer review with the plan's medical director — the treating physician speaks directly to the reviewer. This often resolves the denial without a written appeal.
If the denial holds, file the internal appeal within 180 days. For urgent care, request expedited review with a 72-hour decision.
Upload the denial letter. Free analysis first, finished letter second.
FAQ
Can I get the service while the appeal is pending?+
If care is urgent, request an expedited appeal — decision within 72 hours. Otherwise the service usually waits unless your provider chooses to deliver it at risk.
Does the new federal rule apply to my plan?+
It applies to Medicare Advantage, Medicaid fee-for-service and managed care, CHIP, and qualified health plans on the federal marketplace. Most large-employer ERISA plans are not directly covered, though many follow similar timelines voluntarily.
More guides
- How to write a health insurance appeal letter
- Internal appeal vs external review: what is the difference
- Expedited appeals: when to ask for an urgent review
- The No Surprises Act and out-of-network bills