Is G2212 still a valid code in 2022?

Yes. There are two codes for office based prolonged time: G2212 for Medicare Part B patients and 99417 for payers that don't follow CMS. The descriptions are the same: Prolonged office or other outpatient evaluation and management service(s) beyond the minimum required time of the primary procedure which has been selected usual total time, requiring total time with or without direct patient contact beyond the usual service, on the date of the primary service, each 15 minutes of total time
(List separately in addition to codes 99205, 99215 for office or other outpatient E/M service). These are to be billed only when billing based on physician time on the date of the encounter exceeds by 15 minutes the time associated with level 5 new or established patient exams.  For a new patient that is 15 min beyond 74 minutes and 15 minutes beyond 54 minutes for an established patient.