J7599 — Immunosuppressive drug, not otherwise classified
J7599 is a HCPCS Level II code for immunosuppressive drug, not otherwise classified. It belongs to the Drugs Administered Other Than Oral Method 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 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Physician fee schedule statusX
Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.
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 J7599 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 3 — Date of Service Edit: Clinical · Clinical: CMS Workgroup
- outpatient
- 1 unit MAI 3 — Date of Service Edit: Clinical · Clinical: CMS Workgroup
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 J7599
- Long descriptor
- Immunosuppressive drug, not otherwise classified
- Short descriptor
- Immunosuppressive drug noc
- Added
- January 1, 1996
- 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 J7599
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If J7599 is not quite right, the correct code is very often within a few positions of it.
- J7517Mycophenolate mofetil, oral, 250 mg
- J7518Mycophenolic acid, oral, 180 mg
- J7519Injection, mycophenolate mofetil, 10 mg
- J7520Sirolimus, oral, 1 mg
- J7521Tacrolimus, granules, oral suspension, 0.1 mg
- J7525Tacrolimus, parenteral, 5 mg
- J7527Everolimus, oral, 0.25 mg
- J7528Mycophenolate mofetil, for suspension, oral, 100 mg
- J7601Ensifentrine, inhalation suspension, fda approved final product, non-compounded, administered through dme, unit dose form, 3 mg
- J7604Acetylcysteine, inhalation solution, compounded product, administered through dme, unit dose form, per gram
- J7605Arformoterol, inhalation solution, fda approved final product, non-compounded, administered through dme, unit dose form, 15 micrograms
- J7606Formoterol fumarate, inhalation solution, fda approved final product, non-compounded, administered through dme, unit dose form, 20 micrograms
- J7607Levalbuterol, inhalation solution, compounded product, administered through dme, concentrated form, 0.5 mg
- J7608Acetylcysteine, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per gram
- J7609Albuterol, inhalation solution, compounded product, administered through dme, unit dose, 1 mg
- J7610Albuterol, inhalation solution, compounded product, administered through dme, concentrated form, 1 mg
Questions about J7599
What is HCPCS code J7599?
J7599 is a HCPCS Level II code for immunosuppressive drug, not otherwise classified. It sits in the Drugs Administered Other Than Oral Method section.
Does Medicare cover J7599?
The CMS HCPCS file marks J7599 as "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.
How is J7599 paid under the physician fee schedule?
J7599 carries PFS status code X. Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.