OIG audit exposes systemic flaws in post-acute care prior authorization processes

A new Office of Inspector General report reveals significant flaws in CMS's prior authorization processes for post-acute care services like inpatient rehab and long-term care. The audit found inadequate program safeguards, insufficient documentation, and inconsistent application of coverage rules across Medicare Administrative Contractors. This systemic critique arrives as payers, including Medicare Advantage plans, are expanding prior authorization reviews. The findings may embolden providers to appeal denials more aggressively and signal increased regulatory scrutiny of payer authorization practices. While no immediate action is required, billing teams for orthopedic, neurological, and post-surgical services should note the OIG's position when documenting medical necessity for skilled nursing and rehab claims.