HCPCS

HCPCS has two levels. Level I is Current Procedural Terminology, the numeric code set of five digits that the American Medical Association maintains and republishes every year. Level II is the set CMS maintains itself, for products, supplies and services that CPT does not describe, such as ambulance services and durable medical equipment, prosthetics, orthotics and supplies. A Level II code is one letter followed by four digits. CMS dates Level II to the 1980s and takes applications for new codes on a fixed calendar: every quarter for drugs and biologicals, twice a year for other items¹.

The reason for one shared system is volume. US insurers process more than 5 billion claims a year, and CMS says standard codes are what let Medicare and other programs handle them in an orderly, consistent way¹. On a professional claim, each service line carries one HCPCS code from either level. Item 24D of the CMS-1500 takes the code and up to four two-character modifiers, with no narrative description, and the code has to come from the set in effect on the date of service³. In the 837P the same code sits in the service line loop, 2400².

The usual confusion is treating HCPCS and CPT as rival systems. CPT is HCPCS Level I, so the real question for each line is whether the service has a CPT code or needs a Level II code instead. Supplies, drugs given in the office and transport often need a Level II code even when the visit on the same day is billed in CPT. Update the charge master whenever CMS adds or changes Level II codes, not only in January.