Summary & Overview
CPT 36218: Selective Catheterization of Thoracic/Brachiocephalic Branches
CPT code 36218 is an add-on selective catheterization code for advancing a catheter into additional first-, second-, third- or smaller-order thoracic or brachiocephalic branch vessels to perform angiography. Nationally, the code captures incremental procedural work when clinicians perform more distal or additional branch catheterizations beyond the primary selective catheterization, affecting documentation, billing granularity, and payment adjudication for vascular diagnostic procedures.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of the clinical context for 36218, the typical settings where the service is provided, and the implications for coding and claims submission. The publication summarizes common billing considerations, lists frequently used modifiers, and outlines benchmarking and policy topics relevant to payers and providers.
This report provides actionable reference material for coding staff, clinical teams, and revenue professionals seeking clarity on when 36218 is reported in addition to a primary selective catheterization code, how sites of service commonly align with the procedure, and what to expect in payer coverage and claims processing at a national level.
Billing Code Overview
CPT code 36218 describes advancement of a catheter into an additional first-, second-, third- or smaller-order thoracic or brachiocephalic branch within a vascular family, typically performed to obtain angiographic imaging of those arteries. This is an add-on catheterization procedure reported in addition to the primary selective catheterization code.
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Service type: Selective catheterization for diagnostic angiography of thoracic or brachiocephalic branch vessels
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Typical site of service: Hospital catheterization laboratory or interventional radiology suite; may also be performed in ambulatory surgical centers equipped for vascular angiography
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with progressive right arm claudication and an abnormal duplex ultrasound suggesting severe stenosis of the right subclavian artery is referred to interventional radiology. After arterial access via the right common femoral artery, the interventionalist performs a primary selective catheterization of the brachiocephalic/subclavian arterial trunk to define the lesion. The provider then advances a smaller, additional-order catheter into a distal brachiocephalic/subclavian branch (for example, the right vertebral or internal mammary branch) to obtain targeted angiographic imaging and evaluate collateral flow prior to decision-making for angioplasty and stenting. Imaging guidance, contrast injection, and fluoroscopic documentation are performed during the selective advancement into the additional branch. The typical site of service is an outpatient endovascular suite, hospital catheterization laboratory, or ambulatory surgery center. The clinical workflow includes pre-procedure history and consent, vascular access and primary selective catheterization, performance of the additional selective catheterization reported with 36218, targeted angiographic runs, hemostasis and post-procedure monitoring, and documentation of vessel selection and contrast injections for coding purposes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
59 | Distinct procedural service | Use when the additional selective catheterization is separate and distinct from other services performed during the same session. |