'Not medically necessary' denials
The single most common appealable denial. The insurer says the treatment isn't medically necessary based on its internal coverage criteria — and most are reversible with the right clinical guideline + insurer-policy citation.
What this denial means
A medical-necessity denial means the plan applied its own medical-necessity criteria (often InterQual or MCG, supplemented by plan-specific medical policy) and concluded the requested service does not meet them for your specific clinical situation. The denial usually cites criteria like 'failure to demonstrate severity', 'alternative lower-level service not tried', or 'clinical evidence does not support'. The plan's criteria are reviewable, citable, and frequently inconsistent with current specialty-society guidelines — which is what makes these denials so commonly winnable.
How to appeal it
The strongest medical-necessity appeals layer four elements: (1) the plan's own published coverage criteria, walked through point-by-point with chart evidence for each; (2) the relevant specialty-society guideline (NCCN, ADA, AHA/ACC, AACE, ACR, etc.) supporting the requested treatment for your specific indication; (3) the federal appeal-rights regulation appropriate to your plan type (ACA §2719 + ERISA §503 for commercial; 42 CFR 422 Subpart M for Medicare Advantage; 42 CFR 438 Subpart F for Medicaid managed care); (4) when applicable, evidence that the plan's criteria are stricter than for comparable services (MHPAEA for mental health/SUD; ACA §1557 for discrimination).
Frequently asked questions
What does “denied as not medically necessary” mean?
A medical-necessity denial means the plan applied its own medical-necessity criteria (often InterQual or MCG, supplemented by plan-specific medical policy) and concluded the requested service does not meet them for your specific clinical situation. The denial usually cites criteria like 'failure to demonstrate severity', 'alternative lower-level service not tried', or 'clinical evidence does not support'. The plan's criteria are reviewable, citable, and frequently inconsistent with current specialty-society guidelines — which is what makes these denials so commonly winnable.
How do I appeal a 'not medically necessary' denials?
The strongest medical-necessity appeals layer four elements: (1) the plan's own published coverage criteria, walked through point-by-point with chart evidence for each; (2) the relevant specialty-society guideline (NCCN, ADA, AHA/ACC, AACE, ACR, etc.) supporting the requested treatment for your specific indication; (3) the federal appeal-rights regulation appropriate to your plan type (ACA §2719 + ERISA §503 for commercial; 42 CFR 422 Subpart M for Medicare Advantage; 42 CFR 438 Subpart F for Medicaid managed care); (4) when applicable, evidence that the plan's criteria are stricter than for comparable services (MHPAEA for mental health/SUD; ACA §1557 for discrimination).
Related
- CARC 50 — These are non-covered services because this is not deemed a …The carrier decided the service isn't medically necessary based on your plan's policy. THIS IS THE F
- CARC 55 — Procedure/treatment/drug is deemed experimental/investigatio…The carrier classified the treatment as experimental. Appealable when FDA-approved, peer-reviewed, o
- CARC 150 — Payer deems the information submitted does not support this …The documentation didn't justify the E&M level (or other tier) billed. The carrier downcoded it.
- CARC 151 — Payment adjusted because the payer deems the information sub…The carrier thinks the volume or frequency exceeds what's medically supported. Common on PT, infusio
- CARC 167 — This (these) diagnosis(es) is (are) not covered.The diagnosis code itself is excluded from coverage under your plan.
- CARC 204 — This service/equipment/drug is not covered under the patient…The benefit-design exclusion — the carrier's policy explicitly leaves this out. Appealable when the
- ERISA §503ERISA §503 is the foundational federal appeal-rights statute for the ~135 million Americans on emplo
- ACA §2719 (PHSA §2719)ACA §2719 guarantees every non-grandfathered group + individual health plan a standardised internal
- 42 CFR 422 Subpart MThe Medicare Advantage appeal track. MA enrollees have FIVE levels of appeal (vs the 2 levels typica
- 42 CFR 438 Subpart FThe federal floor for Medicaid managed care appeals. Beneficiaries get internal plan appeal + State
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Appeal a 'not medically necessary' denials denial
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