HCPCS Code C9399: Unclassified Drugs or Biologicals

Use HCPCS Code C9399 to bill new, unclassified drugs under OPPS/ASC—include the NDC, quantity, and remarks for accurate manual pricing.

Use Code

Frequently asked questions

HCPCS code C9399 is used to report new FDA-approved drugs or biologicals that do not yet have an assigned HCPCS code. It is billed under the Hospital Outpatient Prospective Payment System (OPPS) or Ambulatory Surgical Center (ASC) setting until a permanent code is established.

The correct HCPCS Level II code for a bath or shower chair is E0240. Code E0163 refers to a commode chair with fixed arms, not a bathtub chair.

Pegfilgrastim (Neulasta) is currently billed with J2506 for each 6 mg dose. The previous code, J2505, was deleted, effective January 1, 2022.

Report C9399 with one unit per line, including the NDC number, total quantity, unit of measure, and date of service. Use revenue code 0636 for outpatient claims and include all details in the Remarks field (or electronic equivalent) for manual pricing by your MAC.