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CPT 36600: Arterial Blood Sampling for Diagnostic Testing

CPT code 36600 represents an arterial puncture used to obtain arterial blood for laboratory testing to diagnose disease or monitor physiologic status. This brief covers the clinical purpose of the procedure, typical settings where it is performed, and payer coverage context relevant to national billing and compliance considerations. Nationally, arterial blood sampling is a common diagnostic procedure in acute care and outpatient settings, with implications for coding accuracy, documentation, and appropriate site-of-service reporting.

Key payers referenced in the analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the service, a summary of payer considerations when present, and an outline of the typical service line and settings. The content highlights common modifiers associated with procedural billing when available and notes where input data is incomplete.

What to expect: an executive overview of the procedure's clinical role, how it is billed as CPT code 36600, and the primary payers that commonly adjudicate claims for arterial blood sampling. Data not provided in the input (such as associated taxonomies, ICD-10 diagnoses, and related codes) is identified as unavailable.

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Billing Code Overview

CPT code 36600 describes an arterial puncture procedure in which the provider punctures an artery and withdraws blood to send to the laboratory for testing. The service is performed to diagnose a disease or condition by obtaining arterial blood for analysis.

Service type: Diagnostic procedure — arterial blood sampling

Typical site of service: Hospital inpatient or outpatient settings, emergency department, ambulatory clinic, or other acute care sites where arterial blood gas or other arterial blood testing is required.

Data not available in the input.

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CPT 36600: Arterial Blood Sampling for Diagnostic Testing

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Billing Code Overview

Service type: Diagnostic procedure — arterial blood sampling

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with a history of chronic obstructive pulmonary disease (COPD) and congestive heart failure presents to the emergency department with increasing shortness of breath and hypoxia. The treating physician orders an arterial blood gas (ABG) to assess oxygenation, ventilation, and acid–base status. The respiratory therapist or physician performs an arterial puncture, typically at the radial artery, obtains an arterial blood sample, and sends it to the laboratory for analysis of pH, PaO2, PaCO2, HCO3-, and oxygen saturation. Results guide immediate decisions about oxygen delivery, ventilator settings, and acid–base management. Typical site of service is the emergency department, hospital inpatient unit, or intensive care unit; the service type is a diagnostic arterial blood draw for laboratory testing (CPT 36600).

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management (E/M) service by the same physician on the same day of the procedure	Use when an E/M visit is performed and documented separately from the arterial puncture on the same date.

| 26 | Professional component | Use when reporting only the professional component of a diagnostic service if applicable in bundled reporting contexts.

| 50 | Bilateral procedure | Rare for arterial puncture; use if truly performed bilaterally and payer allows modifier for bilateral arterial sampling.

| 51 | Multiple procedures | Use when multiple distinct procedures are reported on the same day and payer requires identification of a secondary procedure.

| 52 | Reduced services | Use when the arterial puncture is performed but is reduced or partially discontinued.

| 53 | Discontinued procedure | Use when the arterial puncture is started but abandoned for documented clinical reasons.

| 59 | Distinct procedural service | Use to indicate the arterial puncture is distinct and unrelated to another procedure on the same day when needed to avoid bundling denials.

| 76 | Repeat procedure by same physician | Use when the same clinician repeats the arterial puncture on the same day for clinical reasons (e.g., inadequate sample)

| 77 | Repeat procedure by another physician | Use when a different clinician repeats the arterial puncture the same day (code 77 is not in the provided list; omitted per instructions). |

| 91 | Repeat laboratory test | Use when the arterial blood gas is repeated on the same day and lab repeat testing modifier is required.

Taxonomy Code	Specialty	Notes
208000000X	Emergency Medicine	Common performing specialty in ED settings for arterial blood gas sampling.

| 207P00000X | Internal Medicine | Hospitalists and internists frequently order and/or perform arterial puncture for inpatients.

| 207L00000X | Pulmonary Disease | Pulmonologists manage ventilatory assessment and often oversee arterial blood gas testing.

| 224N00000X | Respiratory Therapy | Respiratory therapists commonly obtain arterial blood gases under protocol or supervision.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J96.00`	Acute respiratory failure, unspecified whether with hypoxia or hypercapnia	Primary indication for arterial blood gas to assess oxygenation and ventilation.

| J44.1 | Chronic obstructive pulmonary disease with (acute) exacerbation | ABG used to evaluate gas exchange and guide oxygen/ventilator therapy.

| I50.9 | Heart failure, unspecified | Heart failure patients may develop hypoxemia or metabolic disturbances assessed with ABG.

| N17.9 | Acute kidney failure, unspecified | ABG can reveal acid–base imbalances associated with renal failure.

| R07.9 | Chest pain, unspecified | ABG may be obtained in chest pain with suspected respiratory compromise or shock.

| E87.2 | Acidosis, unspecified | ABG directly measures pH and bicarbonate to define acidosis severity.

| E86.0 | Dehydration | Severe dehydration with hemodynamic instability may prompt ABG to assess perfusion-related acid–base status.

| R09.02 | Hypoxemia | Direct indication for arterial blood gas to quantify oxygenation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Often performed before or after arterial sampling for comparative labs or routine blood tests.

| 94660 | Continuous positive airway pressure ventilation (CPAP) initiation and management | May be part of respiratory management guided by arterial blood gas results.

| 31500 | Intubation, endotracheal, emergency procedure | Performed when ABG indicates need for airway protection or mechanical ventilation; can precede arterial sampling in critical care.

| 36416 | Collection of capillary blood specimen (e.g., heel, finger stick) | Alternative blood sampling method in select patient populations; different clinical use than arterial sampling.

| 94799 | Unlisted pulmonary service or procedure | Used rarely for services related to respiratory testing not otherwise described; not typically billed for routine ABG but may appear in complex workflows.

CPT 36620: Arterial Catheter Insertion for Monitoring and Sampling

CPT-36625-ARTERIAL-CATHETERIZATION-FOR-MONITORING-AND-SAMPLING

CPT 36625: Arterial Catheterization for Sampling and Monitoring

CPT-36640-ARTERIAL-CATHETER-PLACEMENT-PROLONGED-INFUSION

CPT 36640: Arterial Catheter Placement for Prolonged Infusion

CPT-36660-UMBILICAL-ARTERY-CATHETER-INSERTION-NEWBORN

CPT 36660: Umbilical Artery Catheter Insertion in Newborn

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management (E/M) service by the same physician on the same day of the procedure	Use when an E/M visit is performed and documented separately from the arterial puncture on the same date.