Actual anesthesia time in minutes is reported on the claim. For anesthesia services furnished on or after January 1, 1994, the A/B MAC computes time units by dividing reported anesthesia time by 15 minutes. Round the time unit to one decimal place. The A/B MAC does not recognize time units for CPT codes 01995 or 01996.
For Medicare, it is minutes in box 24g units field. other carriers might require different arrangements, but I personally have not encounter any problems billing by minutes.
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