Summary & Overview
CPT 36625: Arterial Catheterization for Sampling and Monitoring
CPT code 36625 covers arterial catheterization performed through a skin incision to place a catheter into an artery for blood sampling, transfusion access, or continuous real-time monitoring of blood pressure and heart rate. This procedure is widely used across acute care settings and is clinically important for critically ill patients, perioperative monitoring, and situations that require frequent arterial blood gas analysis. Nationally, accurate coding for arterial catheter placement affects care documentation, facility billing, and resource planning in hospitals and critical care units.
Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 36625, the typical sites of service where it is performed, and how the code is positioned within hospital and critical care service lines. The publication also summarizes common modifiers associated with vascular and procedural coding and notes where input data was not provided.
This report is intended for billing managers, revenue cycle staff, clinical coders, and policy analysts seeking a national perspective on the code’s clinical application and billing context. It clarifies the scope of services represented by the code and outlines what elements to consider when assigning CPT code 36625 in acute care documentation and claims workflows.
Billing Code Overview
CPT code 36625 describes a procedure in which a clinician makes a skin incision to expose an artery and inserts a catheter into the artery. The catheter is used for arterial blood sampling, transfusion access, or continuous real-time hemodynamic monitoring of blood pressure and heart rate.
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Service type: Invasive vascular catheterization for arterial access and monitoring
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Typical site of service: Operating room, interventional suite, or intensive care unit (bedside) where arterial sampling or continuous monitoring is required
Clinical & Coding Specifications
Clinical Context
A typical patient is a hospitalized adult requiring invasive arterial access for continuous real-time hemodynamic monitoring or repeated arterial blood sampling. For example, a 68-year-old patient admitted to the intensive care unit with septic shock and hypotension requires continuous arterial blood pressure monitoring and frequent arterial blood gas sampling to guide titration of vasopressors and ventilator settings. The provider performs 36625 by identifying a peripheral artery (commonly radial or femoral) under sterile conditions, making a small skin incision, and inserting an arterial catheter for sampling, transfusion, or continuous hemodynamic monitoring. The procedure is commonly performed in the ICU, operating room, or interventional radiology suite. Pre-procedure workflow includes verification of indications, informed consent when feasible, review of anticoagulation status, and site-selection based on collateral circulation (e.g., Allen test for radial access). Post-procedure workflow includes securement of the catheter, pressure transducer setup for continuous monitoring, documentation of arterial waveform confirmation, site care instructions, and monitoring for complications such as bleeding, thrombosis, or infection.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | Use when the arterial catheter is placed in a left-sided artery (e.g., left radial). |
RT | Right side | Use when the arterial catheter is placed in a right-sided artery (e.g., right radial). |
50 | Bilateral procedure | Rarely used but applies if identical arterial catheterizations are billed bilaterally in contexts where bilateral modifier reporting is required. |
59 | Distinct procedural service | Use when an arterial catheter placement is a distinct service from other procedures performed at the same session and not normally reported together. |
52 | Reduced services | Use when the procedure is partially reduced or not completed as originally described. |
53 | Discontinued procedure | Use when the procedure is started but terminated due to extenuating circumstances. |
76 | Repeat procedure by same physician | Use when the same provider performs a repeat arterial catheter placement during the same encounter. |
77 | Repeat procedure by another physician | Use when a different provider repeats the arterial catheter insertion during the same encounter. |
22 | Increased procedural services | Use when work required is substantially greater than typical (e.g., difficult anatomy, multiple attempts). |
78 | Unplanned return to the operating/procedure room by the same physician following a procedure for a related procedure during the postoperative period | Use if an unplanned re-intervention on the arterial catheter site occurs in the global period. |
26 | Professional component | Use when billing only the physician professional component separate from facility technical component (rare for this service). |
QX | Modifiers for physician assistant services — assistant-at-surgery or component designation | Use when a physician assistant performs or assists and payer requires reporting of PA participation. |
XE | Separate encounter | Use when the arterial catheter placement is performed in a separate encounter unrelated to other services on the same day. |
GA | Waiver of liability statement on file (represented here by GC in provided list) | Use GC when the service is performed under a trainee or teaching physician arrangement where the teaching physician confirms presence. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 208D00000X | Vascular Surgery | Vascular surgeons frequently place arterial catheters in operative and ICU settings. |
| 207RP1001X | Interventional Cardiology | Interventional cardiologists place arterial lines for hemodynamic monitoring during procedures. |
| 207L00000X | Emergency Medicine | Emergency physicians commonly place arterial lines for critically ill or unstable patients. |
| 208000000X | General Surgery | General surgeons place arterial catheters intraoperatively or in critically ill surgical patients. |
| 207K00000X | Anesthesiology | Anesthesiologists commonly place arterial catheters for continuous blood pressure monitoring during surgery and in critical care. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
I95.9 | Hypotension, unspecified | Common indication for invasive arterial monitoring in hemodynamically unstable patients. |
R57.2 | Septic shock | Patients in septic shock frequently require continuous arterial pressure monitoring and frequent arterial blood gases. |
J96.00 | Acute respiratory failure, unspecified whether with hypoxia or hypercapnia | Critically ill, mechanically ventilated patients often need arterial lines for blood gas monitoring. |
I46.9 | Cardiac arrest, cause unspecified | Post-resuscitation patients often require invasive hemodynamic monitoring via arterial catheter. |
I21.9 | Acute myocardial infarction, unspecified | Hemodynamically unstable myocardial infarction patients may require arterial pressure monitoring during intervention and recovery. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
36000 | Introduction of needle or intracatheter, vein | Peripheral venous access that may be performed before or after arterial catheter placement for infusion or medication administration. |
36556 | Insertion of non-tunneled centrally inserted central venous catheter; age 5 years or older | Central venous access often performed in conjunction with arterial catheterization for comprehensive hemodynamic monitoring and medication administration. |
36904 | Introduction of needle and/or catheter into extracranial, peripheral or visceral artery, initial diagnostic or therapeutic; each vessel catheterized | Endovascular diagnostic or therapeutic arterial catheterization that may be preceded by a peripheral arterial line for monitoring. |
99291 | Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes | Critical care time frequently reported when arterial catheter placement occurs as part of management of a critically ill patient. |
99213 | Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes | Outpatient encounters may involve arterial catheter placement in select settings or follow-up care related to arterial line complications or removal. |
36510 | Insertion of non-tunneled centrally inserted central venous catheter; younger than 5 years | Pediatric central venous access when arterial monitoring and venous access are both required for pediatric patients. |