Medical necessity
The standard for whether a service is required to diagnose or treat a condition — and the most common reason for denied claims.
Medical necessity is the clinical standard that a service is needed to diagnose or treat an illness or injury. Each plan defines its own criteria, often citing InterQual or MCG, supplemented by plan-specific medical policy. Medical-necessity denials (CARC 50) are the flagship appealable denial — most are reversible by citing the plan's own criteria, the relevant specialty-society guideline, and the federal appeal-rights regulation.
Frequently asked questions
What is medical necessity?
Medical necessity is the clinical standard that a service is needed to diagnose or treat an illness or injury. Each plan defines its own criteria, often citing InterQual or MCG, supplemented by plan-specific medical policy. Medical-necessity denials (CARC 50) are the flagship appealable denial — most are reversible by citing the plan's own criteria, the relevant specialty-society guideline, and the federal appeal-rights regulation.
Is this relevant to a denial appeal?
Medical-necessity denials are the most commonly appealed and most commonly won.
Related terms
- Prior authorization (PA)Plan approval required BEFORE a service is rendered, otherwise the plan won't pay.
- Internal appealThe first formal review of a denial — conducted by the plan itself, by someone other than the origin
- External reviewBinding review by an Independent Review Organization after internal appeal is exhausted. The IRO dec
Appeal a denial
Medical-necessity denials are the most commonly appealed and most commonly won.
Get started →Contact: hello@denialhelp.com