In calculating how many 30-minute intervals to report, hospitals should take into consideration the time spent under pressure during descent, airbreaks, and ascent.
In general, an additional unit of service cannot be coded unless the patient is in the chamber receiving hyperbaric oxygen treatment for at least 16 minutes beyond the previous 30-minute period. To appropriately report C1300:
The first unit reported must be at least 16 minutes in length
The second unit cannot be coded unless the session is at least 46 minutes long (first unit = 30 minutes + 16 additional minutes)
The third unit cannot be coded unless the session is at least 76 minutes long (first and second units = 60 minutes + 16 additional minutes)
The fourth unit cannot be coded unless the session is at least 106 minutes long (first, second, and third units = 90 minutes + 16 additional minutes.) In general, the Centers for Medicare and Medicaid Services (CMS) does not expect that a physician order for 90 minutes of HBO therapy would exceed four billed units of HCPCS code C1300.
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