Q9998 – Injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mg
HCPCS Level II code · Q codes: Temporary Codes
HCPCS codeQ9998
- Long description
- Injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mg
- Short description
- Inj ustekinumab-aekn, 1 mg
- Pricing indicator
51Drugs- Medicare coverage
CCarrier judgment – coverage decided by the Medicare contractor- BETOS category
O1EOther drugs- ASC
- Approved for ambulatory surgical centers
- Added
- January 1, 2025
- Last change
- July 1, 2025 – No change
Frequently asked questions
What is HCPCS code Q9998?
Q9998 is a HCPCS Level II code for injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mg.
Does Medicare cover Q9998?
The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby Q codes
- Q9989 – Ustekinumab, for intravenous injection, 1 mg
- Q9991 – Injection, buprenorphine extended-release (sublocade), less than or equal to 100 mg
- Q9992 – Injection, buprenorphine extended-release (sublocade), greater than 100 mg
- Q9993 – Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg
- Q9994 – In-line cartridge containing digestive enzyme(s) for enteral feeding, each
- Q9995 – Injection, emicizumab-kxwh, 0.5 mg
- Q9996 – Injection, ustekinumab-ttwe (pyzchiva), subcutaneous, 1 mg
- Q9997 – Injection, ustekinumab-ttwe (pyzchiva), intravenous, 1 mg
- Q9999 – Injection, ustekinumab-aauz (otulfi), biosimilar, 1 mg
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.