How to appeal a denied claim for prior-authorization denial.
When the EOB cites a prior-authorization defect — a missed step, a documentation gap, or an administrative lapse — the appeal letter is built around the procedural defect, not a re-argument of the underlying medical necessity. The governing framework splits by plan type: the ACA Nondiscrimination obligation at 45 C.F.R. § 147.136 constrains substantive prior-auth clinical criteria and the ERISA § 503 claims-procedure rule at 29 C.F.R. § 2560.503-1 governs the appeals process for self-funded plans, while fully-insured plans layer the controlling state's adverse-determination statute on top. URAC-accredited utilization management and the federal NQTL comparability-and-standards framework shape the substantive clinical criteria the plan applies at review.
01 · What this segment looks like
A prior-authorization denial — and the appeal frameworks that apply to it.
The prior-authorization segment captures a specific shape: the plan denies or refuses to authorize a service, drug, or device on a procedural ground — a documentation gap, a missed precertification step, a fail-first step-therapy adjunct, or a re-authorization cycle that the plan reset mid-plan-year. The EOB is not a denial of medical necessity per se; it is a denial resting on a procedural defect, with the substantive clinical evidence still attached to the case file. Two appeals frameworks sit underneath this shape. ACA marketplace plans are bound by the Nondiscrimination obligation at 45 C.F.R. § 147.136: utilization-management techniques and benefit-design elements may not discriminate, and prior-auth clinical criteria must be disclosed and applied consistently (the federal NQTL comparability-and-standards framework, codified at 45 C.F.R. § 156.115(a)(3) and 45 C.F.R. § 147.136(e), sets the rule). Self-funded ERISA plans run through the Department of Labor's claims-procedure rule at 29 C.F.R. § 2560.503-1 — the right to the claims file under (m), the requirement that the plan name its clinical experts under (j)(4), and the pre-service urgent-claim timeframe under (f)(2).
URAC-accredited utilization management — the accreditation standard most major-market carriers self-certify against (UM 1–UM 8 in the URAC Health Utilization Management Standards) — supplies the working definition of a prior-auth defect that a Utilization-Management nurse is configured to respond to: a denial grounded in a documented clinical criterion, an evidence-based review of the medical record, and a peer-reviewer escalation channel. The substantive clinical criteria the plan applies at prior-auth review are the same criteria that control on appeal — a prior-auth defect is procedural, not a re-evaluation of clinical necessity — and the appeal letter can leverage that frame instead of re-arguing the diagnosis. Fully-insured plans layer the controlling state adverse-determination statute on top of the federal framework: Tex. Ins. Code § 4201.354 (Texas), N.Y. Ins. Law § 3214-a (New York), Cal. Health & Safety Code § 1371.35 (California), 215 ILCS 5/356z.4a (Illinois) — and those state regimes name the adverse-determination notice requirements, the internal-appeal window, and the external-review channel that apply on top of the federal framework.
A well-built prior-auth appeal letter cites the right framework — the ACA Nondiscrimination rule, the ERISA § 503 claims-procedure rule, the URAC-accredited UM standard, or the controlling state adverse-determination statute — attaches the documentation supporting the prior-auth request that the plan's own criteria required, and frames the procedural defect as the eligible waiver basis for retrospective review. The letter branches on whether the request is filed pre-denial (urgent care, where the prior auth is needed to start the prescribed therapy) or post-denial (the EOB is in hand, the carrier has set the prior-auth defect on a 'precertification not obtained' or 'criteria not met' rationale), and whether the plan is fully-insured or self-funded ERISA.
The three prior-auth shapes we see most
- 01
Imaging or procedure prior-auth defect
MRI, CT, or interventional radiology requests where the plan has denied on a 'precertification not obtained' or 'clinical criteria not met' rationale. The denial letter cites a procedure code, a clinical-review determination, and a documentation gap the plan asserts was not cured before the Adverse Benefit Determination. The appeal attaches the supporting clinical evidence — the referring-physician's order, the prior-auth reference number, the documentation that was already on file — and re-frames the prior-auth defect as a procedural defect that does not relieve the plan of its obligation to perform a substantive review on the same clinical record.
- 02
Prescription or step-therapy adjunct prior-auth defect
Pharmacy or step-therapy exception denials where the carrier has refused the prior-auth on a 'fail-first required' or 'step-therapy criteria not satisfied' rationale. The denial letter cites a step-therapy exception failure and references the documented prior-failure history that the plan's own clinical reviewer omitted from the record. The appeal attaches the prior-failure documentation, frames the step-therapy exception under the ACA Nondiscrimination rule at 45 C.F.R. § 147.136, and asks for a one-time formulary exception with retroactive prior-auth waiver.
- 03
DME or re-authorization prior-auth defect
Durable medical equipment (CPAP, oxygen, mobility, prosthetics) or quarterly / annual re-authorization cycles that the plan has denied on a 'precertification not obtained' or 'annual reauthorization required' rationale on a service that was previously authorized on the same plan year. The denial letter cites a re-auth deadline the plan argues the member missed, and the prior-auth defect is procedural — the underlying clinical evidence (the prescription, the equipment request, the prior re-authorization) does not change between the originally authorized service and the denied retier. The appeal cites the documented prior authorization, asks for waiver of the procedural defect on equitable grounds, and requests reprocessing under the plan's own criteria.
02 · Frequently asked
The URAC, NQTL, ERISA, and ACA frameworks that apply on a prior-auth denial.
Three questions a member typically has before drafting a prior-auth appeal — with the specific federal regulation and the right of review attached to each answer.
03 · Submit the prior-authorization denial
The EOB reprocessed, with the procedural defect waived and the underlying clinical record attached.
Upload the most recent denial letter or EOB, answer the four short intake questions, and Denvow picks the URAC UM and federal NQTL framework or the ERISA § 503 claims-procedure rule — and the letter branches on whether you're at the first-stage internal appeal or the second-stage external review.
Already in the intake? Pre-selected to “prior authorization” as the Segment-Denial-Reason — answer the rest and submit.
Other denial-reason pages
Denvow is template-and-tooling, not legal counsel. For denials that genuinely need litigation, an ERISA fiduciary complaint, or a state-court remedy, we recommend a licensed attorney in the relevant jurisdiction — and will say so when we see one.