Why long-term disability claims get denied

Most group long-term disability policies pay under two definitions in sequence. For an initial period, commonly 24 months, you are disabled if you cannot perform the material duties of your own occupation; after that the test usually tightens to any occupation suited to your education, training, and experience, and many terminations happen at exactly that switch. The policy language, not your doctor’s opinion, decides which test applies and when.
Other denials come from exclusions and limits. A pre-existing condition clause bars benefits when you were treated for the condition in a look-back window before coverage began and became disabled within a set period after it. Many policies cap benefits for conditions classified as mental or nervous, or as self-reported symptoms such as chronic pain and fatigue, at a fixed number of months. Each is a contract term you can read, with a factual predicate the insurer has to get right.
The rest are about evidence: a paper review by a doctor the insurer hired who never examined you, surveillance that turns a trip to the grocery store into proof you can work, a vocational report listing jobs without testing them against your restrictions. Under the ERISA claims regulation, the denial letter must state the specific reasons, cite the plan provisions, describe any material needed to perfect the claim, and explain the appeal procedure and your right to sue (29 C.F.R. 2560.503-1(g)(1)). Read it as a map of what the appeal must rebut.