Caregiving & Chronic IllnessJanuary 25, 2026·5 min read
By the CIRRUS Editorial Team — how we write and source this
Insurance denials: appeal basics worth knowing
A denied claim isn't necessarily a final answer. Here's the general process most insurers are required to offer.
Most insurance denials come with a specific stated reason — often a coding issue, a missing prior authorization, or a determination the service wasn't medically necessary under plan criteria — and that stated reason determines what kind of appeal actually makes sense to file.
Insurers are generally required to offer an internal appeal process, and after that's exhausted, an external review by an independent third party in most cases — a formal, structured system, not simply asking nicely a second time.
A physician's detailed letter of medical necessity, specific to the individual patient's situation rather than a generic template, is consistently one of the more effective tools in a successful appeal — worth requesting directly and providing your doctor with the specific denial reason to address.
Appeal windows are time-limited and vary by plan and denial type, which makes acting promptly on a denial letter more important than it might feel in the moment — setting the appeal in motion while continuing to research options tends to work better than delaying while deciding.
This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.