CMS has a six-page online update of COVID rules through April 30: online here.
See also a two-page CMS listing of lab codes that can be ordered by any "health professional" (not just the "physician who is treating the patient") - here. Note that the listing of lab codes includes CMS and AMA CPT COVID codes, including serology, but also influenza and RSV-containing codes, as long as they are ordered along with at least one COVID test and are part of the differential diagnosis of COVID. This list includes the circa-$400 test, 87633, respiratory panel, 12-25 targets, which includes influenza virus and respiratory syncytial virus.
|screen shot only; see six page PDF at link in text|