A new Commonwealth Fund survey reports that 20% of privately insured U.S. adults were denied coverage for a doctor-recommended treatment or service in the past year. The data underscores the persistent friction in the prior authorization and medical necessity review process across commercial payers. For billing operations, this signals sustained high denial volumes and appeals work. While not a policy change, it confirms the operational environment: practices must maintain robust clinical documentation and prepare for aggressive payer pushback on recommended care.