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Dialysis CPT code 90999

Schwenksville, PA
Best answers
Please only respond to this thread if you have actual Dialysis/ESRD billing experience.
I am looking for CMS regulations or information that describes the circumstances under which 90999 can be billed. I know dialysis more frequent than 3 times a week is one instance. But I am also finding outdated material with a reference to 90999 for hospital observation.
I appreciate any help with this!