Q9958 — High osmolar contrast material, up to 149 mg/ml iodine concentration, per ml
Q9958 is a HCPCS Level II code for high osmolar contrast material, up to 149 mg/ml iodine concentration, per ml. It belongs to the Temporary Codes 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 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 Q9958 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
- 300 units MAI 3 — Date of Service Edit: Clinical · Prescribing Information
- outpatient
- 600 units MAI 3 — Date of Service Edit: Clinical · Clinical: Data
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 Q9958
- Long descriptor
- High osmolar contrast material, up to 149 mg/ml iodine concentration, per ml
- Short descriptor
- Hocm <=149 mg/ml iodine, 1ml
- Added
- July 1, 2005
- BETOS
- I1E
- 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 Q9958
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If Q9958 is not quite right, the correct code is very often within a few positions of it.
- Q9004Department of veterans affairs whole health partner services
- Q9950Injection, sulfur hexafluoride lipid microspheres, per ml
- Q9951Low osmolar contrast material, 400 or greater mg/ml iodine concentration, per ml
- Q9953Injection, iron-based magnetic resonance contrast agent, per ml
- Q9954Oral magnetic resonance contrast agent, per 100 ml
- Q9955Injection, perflexane lipid microspheres, per ml
- Q9956Injection, octafluoropropane microspheres, per ml
- Q9957Injection, perflutren lipid microspheres, per ml
- Q9959High osmolar contrast material, 150-199 mg/ml iodine concentration, per ml
- Q9960High osmolar contrast material, 200-249 mg/ml iodine concentration, per ml
- Q9961High osmolar contrast material, 250-299 mg/ml iodine concentration, per ml
- Q9962High osmolar contrast material, 300-349 mg/ml iodine concentration, per ml
- Q9963High osmolar contrast material, 350-399 mg/ml iodine concentration, per ml
- Q9964High osmolar contrast material, 400 or greater mg/ml iodine concentration, per ml
- Q9965Low osmolar contrast material, 100-199 mg/ml iodine concentration, per ml
- Q9966Low osmolar contrast material, 200-299 mg/ml iodine concentration, per ml
Questions about Q9958
What is HCPCS code Q9958?
Q9958 is a HCPCS Level II code for high osmolar contrast material, up to 149 mg/ml iodine concentration, per ml. It sits in the Temporary Codes section.
Does Medicare cover Q9958?
The CMS HCPCS file marks Q9958 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 Q9958 paid under the physician fee schedule?
Q9958 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).