“We find that, across HealthCare.gov insurers with complete data, nearly 17% of in-network claims were denied in 2021. Insurer denial rates varied widely around this average, ranging from 2% to 49%………….about 14% were denied because the claim was for an excluded service, 8% due to lack of preauthorization or referral, and only about 2% based on medical necessity. Most plan-reported denials (77%) were classified as ‘all other reasons.”
Claims Denials and Appeals in ACA Marketplace Plans in 2021 | KFF
