Anthem reimburses professional anesthesia services using the CMS-based anesthesia allowance formula and time increments. Anesthesia time must be reported in minutes with documented start and stop times; claims submitted with an indicator other than minutes may be rejected or denied. Time units are based on 15-minute increments per CMS guidance.
Modifier use must follow policy and state/CMS requirements; modifiers identifying who performed the anesthesia service must be billed in the primary modifier field or claims will be denied. Anthem allows Modifier 99 and permits additional reimbursement for physical status modifiers P3, P4, and P5 (P3 and P4 increase unit value by two; P5 increases unit value by four). Anthem does not allow Modifier AD or Modifier 23.
When multiple anesthesia procedures occur on the same date, reimbursement is based on the anesthesia procedure with the highest base unit value plus the overall anesthesia time across procedures. For obstetrical neuraxial epidural analgesia in labor and delivery, Anthem allows reimbursement for up to 300 minutes by either the delivering physician or a qualified provider; reimbursement for time >300 minutes requires submission of additional documentation for dispute review. Separately reimbursable services (e.g., Swan-Ganz catheter, central venous pressure line, intra-arterial lines, emergency intubation when in conjunction with anesthesia, critical care visits, transesophageal echocardiography) are paid per fee schedule or contracted rate without reporting time.
Scope: This policy defines Anthem's reimbursement rules for professional anesthesia services — including time reporting, modifier usage, multiple procedures, obstetrical neuraxial epidural limits, separately reimbursable services, and nonreimbursable items — and applies to professional providers for Anthem-covered members unless superseded by provider, state, federal, or CMS contracts.