Medical Necessity Denials
What a Medical Necessity Denial Means
A medical necessity denial, often paired with claim code CO-50, means the health plan decided a service does not meet the criteria in its own commercial medical policy or utilization-management guidelines. That is a clinical determination made against the plan's specific rules, not a finding that the treating provider was wrong or that the care was pointless.
Is This an Imaging Denial?
Is this an MRI or other diagnostic-imaging denial?
Remedy Support currently prepares paid appeal packets only for medical necessity denials on high-tech diagnostic imaging, such as MRI, CT, and PET scans. If that describes your denial, view the radiology-specific guide instead, which covers the narrow workflow Remedy Support supports today.
Scope
This page is informational
Outside the diagnostic-imaging exception above, Remedy Support does not currently offer paid appeal preparation for medical necessity denials. This page explains what the denial means and how the internal and external review process generally works, so you or your provider can prepare your own appeal.
Is this an MRI or other diagnostic-imaging denial? View the radiology-specific guide →
What the Denial Means
How a medical necessity denial usually works
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The plan is applying its own criteria, not a universal standard
Commercial plans generally apply their own medical policy bulletins or utilization-management criteria, not Medicare's Local Coverage Determinations or National Coverage Determinations. Those Medicare-specific rules do not govern most commercial coverage, so a denial letter that references them in a commercial context is worth double-checking.
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What the denial does not establish
A medical necessity denial does not establish that the treating provider made an error, that the condition does not exist, or that no version of the service could ever be covered. It usually means the documentation submitted did not clearly show that the plan's specific criteria were met at the time of the request.
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Documentation gaps are the most common cause
Denials frequently trace back to missing objective findings: lab results, imaging, records of conservative treatments already tried, symptom severity, or a clear statement connecting the patient's condition to the plan's published criteria. A short note saying a treatment is "necessary" is generally weaker than a letter that walks through the specific criteria point by point.
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Internal appeal, then possible external review
The internal appeal should identify the plan's own medical policy and respond to it directly with clinical evidence. If the internal appeal is upheld and the case rests on clinical judgment, many plans must offer an external review by an independent reviewer. Availability, process, and deadlines depend on your plan type, funding structure, and state.
Official Resources
Where to read more
Remedy Support does not currently offer paid appeal preparation for non-imaging medical necessity denials. These official resources cover internal and external review rights.
- DOL EBSA: Filing a Claim for Your Health Benefits
Federal guidance on ERISA claims and appeals procedure.
- HealthCare.gov: Internal and External Review
How internal appeals and external review generally work.
Common Questions
Frequently Asked Questions
Does 'medical necessity' mean the same thing across all plans?
No. Each commercial plan defines medical necessity through its own medical policy bulletins and utilization-management criteria. There is no single universal standard, and Medicare's coverage rules generally do not apply to commercial plans.
Is medical necessity the most common reason claims are denied?
No. Medical necessity is one of the less common reasons for in-network marketplace denials, well behind unspecified administrative reasons in federal data. A denial coded as medical necessity is worth checking against the plan's own written criteria rather than assumed to be unbeatable.
Does Remedy Support help with medical necessity appeals?
Currently, only for high-tech diagnostic imaging denials such as MRI, CT, and PET scans. Other medical necessity denials are outside the current baseline service.
Am I always entitled to an external review?
External review is commonly available for denials that rest on clinical judgment, but it is not automatic. Whether it applies, and the deadline to request it, depends on your plan type, funding structure, and state.