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Anaesthesia Modifier - AA



Coding Guidelines : AA modifier is used to revenue code 0963 within the CPT range of 00100 – 01999

Description : Anesthesia services performed personally by an anesthesiologist.

Payment for services that meet the definition of personally performed is based on the base units and time in increments of 15-minute units as defined by CMS.

Documentation Modifiers direct prompt and correct payment of the anesthesia claims submitted. Documentation modifiers (AA, QK, AD, QY, QX and QZ) must be billed in the first modifier field. If a QS modifier applies, it must be in the second modifier field. Processing delays and denials may occur for claims submitted without the modifiers in the correct position.

One of the following modifiers must be reported with anesthesia services in the first modifier field to indicate who performed the anesthesia services.

AA – Anesthesia services performed personally by an anesthesiologist.
QK - Medical direction by a physician of two, three, or four concurrent anesthesia procedures
AD - Medically supervised by a physician, more than four concurrent anesthesia procedures.
QY - Medical direction of one CRNA/AA (Anesthesiologist Assistant) by an anesthesiologist
QX - CRNA/AA (Anesthesiologist Assistant) service with medical direction by a physician.
QZ - CRNA/AA (Anesthesiologist Assistant) service without medical direction by a physician.

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