HCPCS drug code · CMS crosswalk
Ustekinumab-AEKN HCPCS Code
In short
Ustekinumab-AEKN is billed under HCPCS Q9998 — Injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mg. One billing unit is 1 mg. CMS's crosswalk lists 4 Ustekinumab-AEKN NDCs under this code.
Reference
- Q9998
- Injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mgBilling unit: 1 mg
- Labelers
- Nupathe Inc
Medicare Part B payment limit
CMS ASP fileEffective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. CMS note: "lesser of" methodology applied. A payment limit is not a coverage decision; the Medicare contractor decides coverage. CMS ASP pricing files
Ustekinumab-AEKN units and claim line
Enter the dose given to get the Q9998 units and the NDC line for the CMS-1500 and the 837P.
Enter the dose given to build the claim line.
Ustekinumab-AEKN NDCs and billing units
From CMS’s ASP NDC–HCPCS crosswalk, effective October 1, 2026 through December 31, 2026. Billing units per package are CMS’s figures for the code’s unit.
| NDC (11-digit) | HCPCS | Labeler | Package | Billing units per package |
|---|---|---|---|---|
| 51759-0413-32 | Q9998 | Nupathe Inc | 0.5 | 45 |
| 51759-0414-32 | Q9998 | Nupathe Inc | 1 | 90 |
| 51759-0709-32 | Q9998 | Nupathe Inc | 0.5 | 45 |
| 51759-0710-32 | Q9998 | Nupathe Inc | 1 | 90 |
Ustekinumab-AEKN: common questions
- What is the HCPCS code for Ustekinumab-AEKN?
- Ustekinumab-AEKN is billed under HCPCS Q9998 — Injection, ustekinumab-aekn (selarsdi), biosimilar, 1 mg. One billing unit is 1 mg. CMS's crosswalk lists 4 Ustekinumab-AEKN NDCs under this code.
- How many Q9998 billing units are in a package of Ustekinumab-AEKN?
- CMS lists 45 to 90 billing units per package, depending on the NDC, where one unit is 1 mg. Units to report are based on the dose given, not the package.
- Is Q9998 a CPT code?
- No. Q9998 is a HCPCS Level II code from CMS for the drug itself. Giving it, for example by injection or infusion, is usually reported with a separate CPT administration code.
Other codes for the same drug
- J3357Ustekinumab, for subcutaneous injection, 1 mg
- J3358Ustekinumab, for intravenous injection, 1 mg
- Q5098Injection, ustekinumab-srlf (imuldosa), biosimilar, 1 mg
- Q5099Injection, ustekinumab-stba (steqeyma), biosimilar, 1 mg
- Q5100Injection, ustekinumab-kfce (yesintek), biosimilar, 1 mg
- Q5137Injection, ustekinumab-auub (wezlana), biosimilar, subcutaneous, 1 mg
- Q5138Injection, ustekinumab-auub (wezlana), biosimilar, intravenous, 1 mg
- Q5164Injection, ustekinumab-hmny (starjemza), biosimilar, 1 mg
- Q9996Injection, ustekinumab-ttwe (pyzchiva), subcutaneous, 1 mg
- Q9997Injection, ustekinumab-ttwe (pyzchiva), intravenous, 1 mg