Glossary
Adverse benefit determination
In one sentence
The formal name for the decision you are appealing. In Medicaid managed care it covers more than an outright refusal: a partial approval, a cut to something already authorized, and a plan that simply does not answer in time all count.
Also written as Denial, Adverse determination.
What adverse benefit determination actually means
Most people call it a denial. The rulebook does not, and the wider name matters, because several things that do not feel like a denial are one. A plan that approves a lower dose than the one prescribed has made an adverse benefit determination. So has a plan that approved the drug in March and stopped it in September. So has a plan that has had the request for weeks and has not decided.
That last one is the least known and the most useful. If your plan has blown its own deadline for deciding, the regulation treats the silence as a determination, which means the clock on your appeal has started and you do not have to wait for a letter to act.
The term belongs to Medicaid managed care. Commercial and employer plans use the same phrase under a different rulebook, and Medicare Part D calls its first decision a coverage determination instead. The definition below is the Medicaid managed care one.
The text it comes from
This is the wording the definition rests on. Where it decides anything for you, read the section rather than our summary of it.
In Medicaid managed care the term covers six situations, not one. The regulation defines it as "the denial or limited authorization of a requested service, including determinations based on the type or level of service, requirements for medical necessity, appropriateness, setting, or effectiveness of a covered benefit," plus "the reduction, suspension, or termination of a previously authorized service," "the denial, in whole or in part, of payment for a service," "the failure to provide services in a timely manner, as defined by the State," and the plan's "failure … to act within the timeframes provided in § 438.408(b)(1) and (2) regarding the standard resolution of grievances and appeals."
42 CFR §438.400(b), Electronic Code of Federal Regulations, effective August 2026 · source
Where this comes from
- 42 CFR §438.400(b), Electronic Code of Federal Regulations, effective August 2026 — www.ecfr.gov/current/title-42/part-438/section-438.400
Where this comes up
American GLP is not a law firm, an insurer, a government office or a clinician, and nothing here is legal or medical advice. This page says what a published rule means by a word. Which rulebook governs you depends on your plan, and your own notice and plan documents govern your case.