Summary & Overview
HCPCS Q9959: High Osmolar Contrast Material, 150-199 mg/ml
HCPCS Level II code Q9959 designates high osmolar iodinated contrast material at a concentration of 150–199 mg/ml billed per milliliter. This supply-oriented code is used when reporting the administered contrast agent for radiologic imaging procedures and is significant for accurate costing and clinical documentation of imaging services nationwide. Accurate coding of contrast media affects facility and professional billing, inventory tracking, and clinical records for diagnostic imaging.
Key payers in standard analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. These payers commonly define coverage, allowable rates, and documentation expectations for contrast agents used in diagnostic imaging.
Readers will find practical information about what this code represents, the clinical context for its use in imaging services, and typical sites where it is administered. The publication also summarizes benchmark considerations, common documentation and billing elements associated with contrast agent supply codes, and any notable policy or coverage themes relevant to national payers. Data not available in the input includes specific payer rate tables, associated ICD-10 diagnoses, and related codes.
Billing Code Overview
HCPCS Level II code Q9959 describes high osmolar contrast material with 150–199 mg/ml iodine concentration, per ml. This code represents a billed supply of iodinated contrast agent used to enhance radiologic imaging studies.
Service Type: Radiology contrast agent supply
Typical Site of Service: Imaging suites, hospital radiology departments, outpatient imaging centers
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with known peripheral arterial disease and chronic kidney disease stage 3 is scheduled for a peripheral angiography to evaluate lower extremity ischemia and plan possible endovascular intervention. The imaging study requires intravascular iodinated contrast; the facility uses a high osmolar contrast agent with iodine concentration in the 150–199 mg/mL range billed as Q9959 and administered in milliliters according to the procedural needs. Typical workflow: pre-procedure assessment (review renal function, allergies), informed consent, intravenous access or arterial catheter placement in the radiology or hybrid endovascular suite, contrast administration under fluoroscopic guidance, image acquisition for diagnostic and procedural decision-making, post-procedure monitoring for allergic or renal complications, and documentation of contrast agent type and volume in the procedure note and charge capture. Typical site of service is an outpatient or inpatient radiology/vascular interventional suite in a hospital or ambulatory surgical center. Common clinical indications include evaluation of arterial stenosis or occlusion, preoperative vascular mapping, or guidance during angioplasty/stent placement.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Unspecified — not commonly used for Medicare reporting | Rarely used; avoid unless payer-specific instruction requires an unspecified modifier |