Z99.81 ICD-10-CM Code: Dependence on supplemental oxygen

Z99.81 is the ICD-10-CM diagnosis code for dependence on supplemental oxygen. A patient requires supplemental oxygen therapy to maintain adequate oxygen levels in their blood due to a chronic lung or heart condition. This code indicates their dependence on oxygen equipment. Z99.81 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to family and personal history and certain conditions influencing health status (z77-z99).

Z99.81 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Document the type of oxygen delivery system (nasal cannula, mask, concentrator, etc.) and the frequency of use (continuous, nocturnal, or as needed) in the medical record.