Use this when you need what Medicare's Physician Fee Schedule allows for a CPT or HCPCS code on a given date of service, for the nation or for one state or locality, in the office or facility setting. It takes up to 25 lines (code, modifier, date of service) and returns one answer per line, in order: CMS's allowed amount (national figure, plus the state range or one locality's figure when a state is given), the CMS release in force on that date, its source files with SHA-256 checksums, and the release catalog URL. It covers dates of service from Jan 1, 2023 through Dec 31, 2026; each date is priced under the quarterly CMS release in force that day, and a date outside that span gets a reason instead of a figure. A code with no national rate on this schedule (bundled, carrier-priced, laboratory, drug, anesthesia, ambulance, supplies, or absent from that release) returns a result_kind and a reason, not an error, and a malformed line returns an error for that line only. Do not use it for hospital outpatient or inpatient facility payments, ambulatory surgery center fees, Medicaid, commercial or workers' compensation rates, CPT code descriptions, or opinions on whether a charge is reasonable. It is read-only; amounts are Medicare-allowed amounts per unit, before sequestration and multiple-procedure reductions.