C9399: Unclassified drugs or biologicals
C9399 is a HCPCS Level II code for unclassified drugs or biologicals. It belongs to the Outpatient Prospective Payment System section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Special coverage instructions apply
There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q4-Oct. This states Medicare’s position on the code, not on your particular claim.
The CMS record for C9399
- Long descriptor
- Unclassified drugs or biologicals
- Short descriptor
- Unclassified drugs or biolog
- Added
- January 1, 2004
- BETOS
- O1E
- Pricing indicator
- 53: Other
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service: CMS's own analytic grouping.
Statute.
Codes adjacent to C9399
HCPCS has no hierarchy: related items simply sit next to each other in the numbering. If C9399 is not quite right, the correct code is very often within a few positions of it.
- C9356Tendon, porous matrix of cross-linked collagen and glycosaminoglycan matrix (tenoglide tendon protector sheet), per square centimeter
- C9358Dermal substitute, native, non-denatured collagen, fetal bovine origin (surgimend collagen matrix), per 0.5 square centimeters
- C9359Porous purified collagen matrix bone void filler (integra mozaik osteoconductive scaffold putty, integra os osteoconductive scaffold putty), per 0.5 cc
- C9360Dermal substitute, native, non-denatured collagen, neonatal bovine origin (surgimend collagen matrix), per 0.5 square centimeters
- C9361Collagen matrix nerve wrap (neuromend collagen nerve wrap), per 0.5 centimeter length
- C9362Porous purified collagen matrix bone void filler (integra mozaik osteoconductive scaffold strip), per 0.5 cc
- C9363Skin substitute, integra meshed bilayer wound matrix, per square centimeter
- C9364Porcine implant, permacol, per square centimeter
- C9407Iodine i-131 iobenguane, diagnostic, 1 millicurieterminated
- C9408Iodine i-131 iobenguane, therapeutic, 1 millicurieterminated
- C9441Injection, ferric carboxymaltose, 1 mgterminated
- C9442Injection, belinostat, 10 mgterminated
- C9443Injection, dalbavancin, 10 mgterminated
- C9444Injection, oritavancin, 10 mgterminated
- C9445Injection, c-1 esterase inhibitor (recombinant), ruconest, 10 unitsterminated
- C9446Injection, tedizolid phosphate, 1 mgterminated