Where the service is performed. Sets the geographic adjustments (GPCIs) and which state's rules apply.
Picks the fee schedule and NCCI quarter. Blank means today; a 2027 date uses next year's (projected) rates.
Traditional Medicare shows the 80/20 split and Medicare-only rules (WISeR, OPD prior auth).
100 for Medicare itself; e.g. 120 for a commercial contract at 120% of Medicare.