J3391 — Injection, atidarsagene autotemcel, per treatment
J3391 is a HCPCS Level II code for injection, atidarsagene autotemcel, per treatment. It belongs to the Drugs Administered Other Than Oral Method section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Physician fee schedule statusE
Excluded from the physician fee schedule by regulation. Payment, where it exists, comes from another fee schedule (drugs via ASP, supplies via DMEPOS, and so on).
Global period: XXX
Want the dollar amount for your locality? The fee calculator applies your GPCI and the current conversion factor.
Medically Unlikely Edits — units per day
The most units of J3391 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 1 unit MAI 2 — Date of Service Edit: Policy · Code Descriptor / CPT Instruction
- outpatient
- 1 unit MAI 2 — Date of Service Edit: Policy · Code Descriptor / CPT Instruction
- DME supplier
- 1 unit MAI 2 — Date of Service Edit: Policy · Code Descriptor / CPT Instruction
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for J3391
- Long descriptor
- Injection, atidarsagene autotemcel, per treatment
- Short descriptor
- Inj, atidarsagene autotemcel
- Added
- July 1, 2025
- BETOS
- O1E
- Pricing indicator
- 51 — 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.
Drugs.
Codes adjacent to J3391
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If J3391 is not quite right, the correct code is very often within a few positions of it.
- J3375Injection, vancomycin hydrochloride (tyzavan), not therapeutically equivalent to j3373, 10 mg
- J3376Injection, vancomycin hcl (hikma), not therapeutically equivalent to j3373, 10 mg
- J3379Injection, valproate sodium, 5 mg
- J3380Injection, vedolizumab, intravenous, 1 mg
- J3385Injection, velaglucerase alfa, 100 units
- J3386Injection, etuvetidigene autotemcel, per treatment
- J3387Injection, elivaldogene autotemcel, per treatment
- J3389Topical administration, prademagene zamikeracel, per treatment
- J3392Injection, exagamglogene autotemcel, per treatment
- J3393Injection, betibeglogene autotemcel, per treatment
- J3394Injection, lovotibeglogene autotemcel, per treatment
- J3396Injection, verteporfin, 0.1 mg
- J3397Injection, vestronidase alfa-vjbk, 1 mg
- J3398Injection, voretigene neparvovec-rzyl, 1 billion vector genomes
- J3399Injection, onasemnogene abeparvovec-xioi, per treatment, up to 5x10^15 vector genomes
- J3400Injection, triflupromazine hcl, up to 20 mgterminated
Questions about J3391
What is HCPCS code J3391?
J3391 is a HCPCS Level II code for injection, atidarsagene autotemcel, per treatment. It sits in the Drugs Administered Other Than Oral Method section.
Does Medicare cover J3391?
The CMS HCPCS file marks J3391 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
How is J3391 paid under the physician fee schedule?
J3391 carries PFS status code E. Excluded from the physician fee schedule by regulation. Payment, where it exists, comes from another fee schedule (drugs via ASP, supplies via DMEPOS, and so on).