How Can You Check Whether an Insurer Used the Correct Medical Necessity Standard?

The short answer

A medical necessity denial should be tested against the specific coverage rule that applied to the patient, the service, and the date of care—not against an unexplained statement that treatment was unnecessary. Request the written criteria, identify the clinical facts the reviewer relied on, and ask the treating clinician to explain any mismatch. The result is a documented appeal rather than an argument about a vague label.

First, identify the rule being applied

Ask for the exact policy title, version or effective date, benefit provision, and medical necessity criteria cited in the adverse determination. A plan may distinguish an excluded benefit from a covered benefit that fails clinical criteria. Those are different problems with different appeal arguments. Also establish whether the decision was prospective authorization, a concurrent review, or a claim for care already received. Do not assume that a prior authorization proves the claim will ultimately be paid; confirm the conditions stated in the approval.

Compare the rule with the record

Build a two-column worksheet. In the left column quote each relevant requirement, such as documented symptoms, prior treatment, imaging, or functional limitations. In the right column identify the chart note and date that address it. Mark requirements that are genuinely unmet rather than hiding them. A clinician can then explain why the requirement is satisfied, why an alternative is inappropriate, or why the criteria do not fit the patient’s clinical circumstances. This is more useful than sending hundreds of unsorted pages.

Request the review file, not just a phone explanation

Ask the plan for the records and documents relevant to its determination, including the clinical criteria and any expert opinion that the applicable rules entitle you to obtain. For job-based plans, the Department of Labor’s health-benefit claims guide explains access to relevant documents and the appeal process. The CMS explanation of health-plan appeals describes internal review and independent external review for eligible decisions. Coverage type matters: Medicare, Medicaid, ERISA plans, and individual-market policies have different procedures.

Create a traceable submission

Use the claim number, member ID, dates of service, and denial date on every page. Send the criteria comparison, a short letter from the clinician, selected chart excerpts, and the denial notice through the designated appeal channel. Keep the submission receipt and a call log. The guide to proving that documents were received can help you establish a delivery record; a portal upload alone is not proof that the reviewer considered each attachment.

A useful appeal paragraph

Consider wording such as: “Please identify the precise medical necessity criterion applied, the policy version effective on the date of service, and the clinical record supporting the conclusion that the criterion was not met. Attached is a point-by-point comparison of the criterion and the treating clinician’s documentation. Please issue a written determination addressing each disputed element.” Adapt the wording to the plan and do not make claims that the records cannot support.

When the deadline or patient’s health changes the approach

Read the notice for the applicable appeal deadline. If waiting for ordinary review could seriously jeopardize health or functioning, ask about expedited review and have the treating clinician document the urgency. The HealthCare.gov appeals guidance describes expedited review for qualifying situations. If the insurer closes an appeal without a reasoned decision, see what to do when an appeal is marked closed. Seek independent clinical advice about treatment rather than delaying urgent care solely for paperwork.

Frequently asked questions

Does a denial prove the treatment was unnecessary? No. It reports the payer’s determination under a particular benefit and review process, which may be disputed. Can a patient request the reviewer’s credentials? Ask what information the applicable plan rules make available and whether a suitably qualified clinician reviewed the issue. Is external review automatic? No. Eligibility and filing steps vary; consult the written notice and governing program. Can the provider appeal? Often a provider can assist or act with appropriate authorization, but the patient’s and provider’s appeal rights may differ.