How does prior authorization affect revenue?

Prior auth creates revenue impact across four dimensions. First, denials: authorization and pre-certification problems caused 13 percent of denials in Optum's 2024 Revenue Cycle Denials Index, and 60 percent of those were for a missing or invalid authorization. They are often unrecoverable because the service was already provided without approval. Second, delay: every request adds a wait before care and before billing, and CMS said its 2024 rule's seven-day limit for standard requests cuts current decision times in half for some payers. Third, administrative cost: in the 2024 CAQH Index, providers and staff reported spending 24 minutes on a prior authorization request by phone, fax or email and 16 minutes through a health plan portal, and portals remain the most common route. The 2025 CAQH Index puts the remaining savings opportunity from fully automating manual and partially manual transactions at $21 billion industry-wide (all transaction types, not prior auth alone), on top of the $258 billion already avoided in 2024. Fourth, staff and physician time: in the AMA's 2025 survey, practices completed an average of 40 prior authorizations per physician per week, taking about 13 hours of physician and staff time, time that is not spent on billable care. Mitigation strategies include: building specialty-specific prior auth lists by payer, securing prior auth before scheduling (not after), using electronic submission where available, tracking denial reason codes specifically for prior auth, and escalating systemic payer issues to provider relations. CMS finalized a rule in January 2024 requiring Medicare Advantage plans, Medicaid and CHIP fee-for-service programs and Medicaid and CHIP managed care plans to decide prior authorization requests within 72 hours for urgent and seven calendar days for standard requests; for most of those payers that requirement has applied since January 1, 2026. Qualified Health Plans on the federal exchanges are exempt from those timeframes.