What claim denial rates mean for you

Why denial rates are the most actionable insurance metric

Most insurance metrics are abstract, complaint ratios, financial-strength ratings, and star ratings need context to interpret. Claim denial rates are concrete: they tell you the probability that a submitted claim will be rejected. If you file 20 claims a year (common for families with ongoing medical needs), a 10% denial rate means 2 denied claims; a 30% rate means 6, each requiring an appeal, documentation, and potentially delayed or forgone care.

CMS publishes denial rates for health insurers through the Transparency in Coverage Public Use File. PlainInsurer integrates this with NAIC complaint ratios and prior-authorization metrics to give you a complete picture of insurer behaviour.

What drives variation in denial rates

The spread between the lowest and highest denial rates among major insurers is enormous. This variation is not random; it reflects deliberate business and clinical decisions.

What it tells you: Insurers with consistently low denial rates tend to use broader coverage definitions, less restrictive prior authorization, and more generous medical-necessity interpretations. High-denial insurers take a more aggressive approach, more documentation, stricter criteria, more first-pass denials.

What it does not tell you: Whether denied claims are ultimately paid after appeal. Some high-denial insurers reverse a large share on appeal, so the initial denial functions as a hurdle rather than a final decision. The CMS data does not include appeal-reversal rates.

How to use it: Pair the denial rate with the complaint ratio. A high denial rate AND a high complaint ratio likely signals genuine consumer harm; a high denial rate with a low complaint ratio may reflect appropriate, expected denials (e.g. out-of-network claims).

Prior authorization denials: a related but distinct metric

Prior-authorization denial rates (available for Medicare Advantage plans from CMS data) measure how often an insurer denies permission before care is delivered, as opposed to claim denials which occur after. High prior-auth denial rates can delay or prevent needed care entirely. If you are choosing a Medicare Advantage plan, check both the claim denial rate and the prior-authorization denial rate.

How denial rates connect to complaint ratios

The relationship is not straightforward. Some insurers with high denial rates have moderate complaint ratios because they process appeals efficiently, denials are reversed quickly and members do not escalate. Others with moderate denial rates have high complaint ratios because denials are handled poorly, slow appeals, weak communication, adversarial responses. Reading both metrics together gives a fuller picture than either alone.

Common questions

Is a 20% denial rate "high"? It depends on the plan type. Medicare Advantage plans typically run higher than ACA marketplace plans because of more aggressive prior-authorization review; narrow-network HMOs run higher than broad-network PPOs. Compare like to like. And where a state exchange publishes appeal-overturn rates, read them alongside the headline denial rate: a 25% denial rate with a 60% overturn rate means the insurer is denying as a first-pass screen, creating friction even when most claims are eventually paid.