Prior to COVID-19, the answer to this measurement days question was fairly straightforward: 16. However, a federal waiverissued early in the pandemic permitted providers to deliver and bill for RPM services to those patients with suspected or confirmed cases of COVID-19. The waiver stated that CMS would permit the reporting of RPM services to Medicare for periods of time of fewer than 16 days but no less than two days during the public health emergency (PHE). This became known as Medicare's "2-day RPM requirement." However, what's important to understand is that billing for CPT code 99453 and CPT code 99454 requires usage of a medical device that digitally collects and transmits 16 or more days of data every 30 days for the billing of these codes. Th is referred to as the "16-day RPM requirement."Some providers and RPM vendors have applied the 2-day RPM requirement to all patients during the PHE. This interpretation is incorrect. In early 2021, CMS stated that the 2-day RPM requirement should only be applied to patients with a suspected or confirmed diagnosis of COVID-19.