Summary & Overview
CPT 36012: Selective Catheterization of Second-Order Venous Branch
CPT code 36012 represents selective catheter placement into a second-order venous branch (for example, the left adrenal vein or a petrosal sinus) to obtain diagnostic sampling or to deliver targeted therapy. This code is used across hospitals and interventional radiology settings and is important for accurate reporting of specialized vascular access procedures that support endocrine, neurologic, and vascular diagnostic workflows. Nationally, correct use of this code affects clinical documentation, procedure-level quality measurement, and payer reimbursement for complex catheter-based interventions. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical context for use of CPT code 36012, typical sites of service, and how the code maps to procedure workflows. The publication reviews common billing considerations, comparator procedure codes, and the operational implications for radiology and vascular service lines. It also summarizes benchmarking information where available and notes areas where policy guidance or coding clarification may affect claims processing. Data not available in the input is identified explicitly where relevant.
Billing Code Overview
CPT code 36012 describes the placement of a catheter into a second-order branch vessel, such as the left adrenal vein or a petrosal sinus, for diagnostic and therapeutic purposes. This procedure can be used to obtain selective venous sampling, measure hormone gradients, or deliver medications directly into a targeted venous branch.
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Service type: Selective catheterization of a second-order venous branch for diagnostic and/or therapeutic intervention
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Typical site of service: Hospital interventional radiology suite, inpatient radiology, or specialized catheterization laboratory
Clinical & Coding Specifications
Clinical Context
A typical patient is a 52-year-old with Cushing syndrome being evaluated for a suspected ACTH-secreting pituitary microadenoma. The patient presents with progressive weight gain, hypertension, glucose intolerance, proximal muscle weakness, and unexplained hypokalemia. Prior biochemical testing demonstrates elevated plasma ACTH with abnormal cortisol suppression testing. Noninvasive imaging (MRI of the pituitary) is inconclusive. The interventional radiology team schedules bilateral inferior petrosal sinus sampling with catheterization of second-order branches to obtain central and peripheral ACTH gradients and, if indicated, administer CRH (corticotropin-releasing hormone) to augment diagnostic yield.
The procedure is performed in an angiography suite with fluoroscopic guidance. Vascular access is typically obtained via the common femoral veins. Under fluoroscopy, the provider advances diagnostic catheters into bilateral inferior petrosal sinuses or other targeted second-order venous branches (such as the left adrenal vein in adrenal sampling) to collect timed blood samples. Medication (e.g., CRH or desmopressin) may be administered through the catheter to stimulate hormone release. Hemostasis is achieved at access sites; the patient is observed in recovery for neurological or vascular complications and for hemodynamic stability prior to discharge or transfer to an inpatient unit.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Normal or uncomplicated procedure |