Denied CT Scan Appeals: What Reviewers Decided

Computed tomography, with or without contrast, ordered by the treating physician and denied at prior authorization or on the claim, typically through the plan's radiology benefit criteria.

What the independent reviewers decided

39%

overturned by the independent reviewer

of 198 decisions in the corpus

Source

California DMHC independent medical review determinations, 2017-2026. Public record.

Read this as a base rate, not as your odds

These are decisions about other patients, in one state, that had already been through the plan's own internal appeal and were then sent to an outside reviewer. That population is self-selected toward disputes worth pursuing, so the rate says what happened to cases like this at that stage — not what will happen to a specific claim. It is not medical or legal advice.

Why plans deny CT scan

The policy names a different modality as the appropriate first study for the indication.
The clinical picture is read as not meeting the policy's threshold for advanced imaging.
Repeat imaging within an interval the policy restricts, without a documented change in the clinical picture.
The study is characterised as surveillance where the policy covers it only for a specific indication.

What actually carried the cases that won

Objective findings ran through almost every overturned CT decision. Because this is the group where the plan's position held most often, the margin is narrow: what distinguished the reversals was a documented finding that made the study the appropriate next step, and, in repeat-imaging disputes, a documented change since the last one. Specialty-society criteria were the authority reviewers most often relied on.

What the record showed	Share of overturned decisions
Objective findings were documented	96%
A published guideline supported the request	39%
The condition was documented as chronic or long-standing	31%
The diagnosis was confirmed	22%
Prior treatment was documented	10%
The severity or urgency was documented	9%
Conservative treatment was documented as failed	6%
The functional impact on the patient was documented	4%

Shares are of the overturned decisions and do not sum to 100% — a single decision often rested on more than one, and some rested on none of these.

What the reviewers cited

Specialty-society criteria — in 38% of the overturned decisions
Clinical guidelines — in 36% of the overturned decisions
Peer-reviewed literature — in 18% of the overturned decisions

CT scan denials — frequently asked

Is a denied CT scan worth appealing?

39% of 198 California independent medical reviews were overturned — the lowest rate of the imaging group. It is still nearly two in five, but a practice deciding where to spend effort should know that CT denials held up more often than MRI or PET denials in this corpus.

What makes a repeat CT appeal stronger?

A documented change. Interval restrictions are among the most common bases for these denials, and the reversals generally showed something different since the prior study — a new finding, a new symptom, a failed treatment — rather than arguing that the interval rule should not apply.

Does the modality argument matter?

Where the policy names a different first study, yes: the appeal has to say why the named study would not answer the clinical question here. Arguing necessity without addressing the policy's stated alternative leaves the plan's reason untouched.

Source

California Department of Managed Health Care — independent medical review determinations

Denial reasons and criteria are described in plain language for reference and vary by plan and policy. This page reports what independent reviewers decided in a public California dataset; it is general information, not medical, legal, or coverage advice.

When the appeal has to be written, and cited

Upload the denied EOB and Merits returns a complete, citation-verified appeal letter — the clinical argument, the payer's own coverage criteria, and your federal appeal rights — in about a minute.

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