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CPT 93740: Intracardiac Temperature Mapping Diagnostic Procedure

CPT code 93740 describes an intracardiac diagnostic electrophysiology procedure that uses a temperature-sensing catheter to map temperature variations across the heart wall to identify malfunctioning myocardial tissue. This specialized diagnostic mapping supports clinical decision-making in patients with arrhythmias or suspected localized myocardial dysfunction and is relevant for hospitals and electrophysiology centers offering advanced catheter-based diagnostics. Nationally, accurate coding for this service impacts clinical documentation, procedure tracking, and reimbursement for invasive cardiac electrophysiology.

Key payers considered include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for the procedure, typical sites of service, common billing modifiers, and payer coverage patterns where available. The publication outlines benchmarks for utilization and reimbursement when provided, highlights relevant policy updates affecting invasive electrophysiology services, and summarizes coding considerations specific to mapping procedures. The content is intended to help billing, compliance, and clinical teams understand the purpose of CPT code 93740, its place within electrophysiology service lines, and the administrative elements that typically accompany its use. Data not available in the input will be explicitly noted in relevant sections.

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Billing Code Overview

CPT code 93740 describes an invasive electrophysiology diagnostic procedure in which a temperature sensor mounted on a catheter is inserted through a vascular access (typically via the femoral vein in the groin) and advanced to the heart. The provider measures temperature variations at multiple locations along the cardiac walls and maps those measurements to identify areas of myocardial malfunction.

Service type: Intracardiac temperature mapping diagnostic procedure
Typical site of service: Hospital cardiac catheterization lab or specialized electrophysiology lab

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CPT 93740: Intracardiac Temperature Mapping Diagnostic Procedure

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Get alerted when payer policies referencing 93740 are released or updated.

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Billing Code Overview

Service type: Intracardiac temperature mapping diagnostic procedure
Typical site of service: Hospital cardiac catheterization lab or specialized electrophysiology lab

Clinical & Coding Specifications

Clinical Context

A 67-year-old male with a history of ischemic cardiomyopathy and recurrent symptomatic ventricular arrhythmias is referred for invasive electrophysiologic mapping. The patient presents with palpitations, presyncope, and an implanted loop recorder demonstrating frequent nonsustained ventricular tachycardia. Prior noninvasive testing including 12-lead ECG and transthoracic echocardiography localize an area of scar in the left ventricle. The electrophysiology team performs a left-sided transvenous catheter procedure under conscious sedation in a cardiac catheterization laboratory. A thermistor-equipped mapping catheter is advanced from the femoral vein (or artery if retrograde aortic approach is required) into the left ventricle to measure temperature variations across endocardial surfaces. Temperature-based mapping is performed to identify regions of abnormal myocardium and correlate with electrical signals for targeted ablation planning. The procedure involves continuous hemodynamic monitoring, fluoroscopic and electroanatomic mapping guidance, sterile vascular access at the groin, and postprocedure recovery in an ambulatory or inpatient observation setting.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard reporting	Use when no special circumstances apply and the service is provided as usual.
`11`	Office or other outpatient service primary physician	Use when this is the primary service furnished by the reporting physician in an outpatient setting.
`22`	Increased procedural services	Use when the work required is substantially greater than typically required.
`23`	Unusual anesthesia	Use when general anesthesia is required due to unusual circumstances unrelated to the procedure itself.
`26`	Professional component	Use when reporting only the physician’s interpretation or professional portion separate from technical component.
`51`	Multiple procedures	Use when more than one procedure is performed at the same session and payer requires a modifier for payment adjustment.
`52`	Reduced services	Use when the procedure is started but not completed or performed in a reduced manner.
`53`	Discontinued procedure	Use when the procedure is terminated due to extenuating circumstances after anesthesia induction or start.
`78`	Return to OR for related procedure during postoperative period	Use when a return to the operating room is required for a related procedure during the global period.
`80`	Assistant surgeon present	Use when an assistant surgeon performs portions of the procedure and payer recognizes assistant services.
`82`	Assistant surgeon (when qualified resident not available)	Use when an assistant surgeon is required and no qualified resident is available.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services	Use when a PA/NP/CNS furnished part of the service per payer rules.
`QX`	Ordering or referring physician not enrolled	Use in specific Medicare/Medicaid situations where supervising clinician arrangements require QX/QK/QY combinations.

Taxonomy Code	Specialty	Notes
2084P0800X	Cardiac Electrophysiology	Electrophysiologists perform invasive mapping and ablation procedures.
208000000X	Cardiology	Interventional cardiologists and cardiac electrophysiology-trained cardiologists perform diagnostic mapping.
207RC0000X	Internal Medicine - Cardiology	Hospital-based cardiologists involved in peri-procedural care and interpretation.
363L00000X	Vascular Surgery	Vascular surgeons may assist with complex femoral/vascular access or complications.
208M00000X	Interventional Cardiology	Operators who perform catheter-based intracardiac diagnostic mapping and interventions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Patients with ischemic cardiomyopathy and scar-related ventricular arrhythmias often have underlying coronary disease contributing to myocardial scar targeted by mapping.
`I42.0`	Dilated cardiomyopathy	Structural heart disease such as dilated cardiomyopathy is a common substrate for ventricular arrhythmias that require mapping.
`I49.01`	Ventricular fibrillation	Life-threatening ventricular arrhythmias that necessitate urgent electrophysiologic evaluation and mapping.
`I49.02`	Ventricular flutter	Rapid ventricular arrhythmias that require invasive mapping to localize the focus.
`I47.2`	Ventricular tachycardia	Primary indication for invasive mapping to localize arrhythmogenic tissue and plan ablation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93653`	Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple catheters, with induction or attempted induction of arrhythmia, including arrhythmia mapping when performed	Often performed before or along with temperature-based mapping as part of a full electrophysiology study to induce and map arrhythmias.
`93656`	Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple catheters; with ablation of arrhythmogenic focus using catheter techniques	Performed when mapping (including temperature mapping) identifies an ablation target; ablation follows mapping in the same session.
`93613`	Intracardiac electrophysiologic testing including injection of programmed stimulation or burst stimulation to induce arrhythmia and recording	Used in tandem with mapping to provoke and record arrhythmias to correlate with temperature mapping findings.
`33210`	Insertion of temporary transvenous electrode catheter; for stimulation/recording	May be performed prior to mapping for pacing, sensing, or backup in unstable arrhythmias during the mapping procedure.
`37205`	Transcatheter therapy via percutaneous femoral access, catheter placement for diagnostic procedures	Represents vascular access and catheter placement procedures closely related to the femoral access used for intracardiac mapping.

Related Codes

CPT-93701-CARDIAC-BIOIMPEDANCE-STUDY

CPT 93701: Cardiac Bioimpedance Study

CPT-93702-BIOIMPEDANCE-LYMPHEDEMA-ASSESSMENT

CPT 93702: Bioimpedance Lymphedema Assessment

CPT-93724-PACEMAKER-TACHYCARDIA-ANALYSIS-INTERPRETATION

CPT 93724: Pacemaker Analysis and Tachycardia Simulation

CPT-93745-WEARABLE-CARDIOVERTER-DEFIBRILLATOR-SETUP-PROGRAMMING

CPT 93745: Wearable Cardioverter Defibrillator Setup and Programming

CPT-93750-VENTRICULAR-ASSIST-DEVICE-PROGRAMMING-TESTING

CPT 93750: Ventricular Assist Device Programming and Testing

CPT-93770-INVASIVE-VENOUS-PRESSURE-MONITORING-CRITICAL-ILLNESS

CPT 93770: Invasive Venous Pressure Monitoring in Critical Illness

CPT-93784-AMBULATORY-24-HOUR-BLOOD-PRESSURE-MONITORING-INTERPRETATION

CPT 93784: Ambulatory 24-Hour Blood Pressure Monitoring with Interpretation

CPT-93786-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR

CPT 93786: Ambulatory Blood Pressure Monitoring, 24-Hour

CPT-93788-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR

CPT 93788: Ambulatory Blood Pressure Monitoring, 24-Hour

CPT-93790-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR-INTERPRETATION

CPT 93790: Ambulatory Blood Pressure Monitoring, 24-Hour Interpretation

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard reporting	Use when no special circumstances apply and the service is provided as usual.
`11`	Office or other outpatient service primary physician	Use when this is the primary service furnished by the reporting physician in an outpatient setting.
`22`	Increased procedural services	Use when the work required is substantially greater than typically required.
`23`	Unusual anesthesia	Use when general anesthesia is required due to unusual circumstances unrelated to the procedure itself.
`26`	Professional component	Use when reporting only the physician’s interpretation or professional portion separate from technical component.
`51`	Multiple procedures	Use when more than one procedure is performed at the same session and payer requires a modifier for payment adjustment.
`52`	Reduced services	Use when the procedure is started but not completed or performed in a reduced manner.
`53`	Discontinued procedure	Use when the procedure is terminated due to extenuating circumstances after anesthesia induction or start.
`78`	Return to OR for related procedure during postoperative period	Use when a return to the operating room is required for a related procedure during the global period.
`80`	Assistant surgeon present	Use when an assistant surgeon performs portions of the procedure and payer recognizes assistant services.
`82`	Assistant surgeon (when qualified resident not available)	Use when an assistant surgeon is required and no qualified resident is available.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services	Use when a PA/NP/CNS furnished part of the service per payer rules.
`QX`	Ordering or referring physician not enrolled	Use in specific Medicare/Medicaid situations where supervising clinician arrangements require QX/QK/QY combinations.

Taxonomy Code	Specialty	Notes
2084P0800X	Cardiac Electrophysiology	Electrophysiologists perform invasive mapping and ablation procedures.
208000000X	Cardiology	Interventional cardiologists and cardiac electrophysiology-trained cardiologists perform diagnostic mapping.
207RC0000X	Internal Medicine - Cardiology	Hospital-based cardiologists involved in peri-procedural care and interpretation.
363L00000X	Vascular Surgery	Vascular surgeons may assist with complex femoral/vascular access or complications.
208M00000X	Interventional Cardiology	Operators who perform catheter-based intracardiac diagnostic mapping and interventions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Patients with ischemic cardiomyopathy and scar-related ventricular arrhythmias often have underlying coronary disease contributing to myocardial scar targeted by mapping.
`I42.0`	Dilated cardiomyopathy	Structural heart disease such as dilated cardiomyopathy is a common substrate for ventricular arrhythmias that require mapping.
`I49.01`	Ventricular fibrillation	Life-threatening ventricular arrhythmias that necessitate urgent electrophysiologic evaluation and mapping.
`I49.02`	Ventricular flutter	Rapid ventricular arrhythmias that require invasive mapping to localize the focus.
`I47.2`	Ventricular tachycardia	Primary indication for invasive mapping to localize arrhythmogenic tissue and plan ablation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93653`	Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple catheters, with induction or attempted induction of arrhythmia, including arrhythmia mapping when performed	Often performed before or along with temperature-based mapping as part of a full electrophysiology study to induce and map arrhythmias.
`93656`	Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple catheters; with ablation of arrhythmogenic focus using catheter techniques	Performed when mapping (including temperature mapping) identifies an ablation target; ablation follows mapping in the same session.
`93613`	Intracardiac electrophysiologic testing including injection of programmed stimulation or burst stimulation to induce arrhythmia and recording	Used in tandem with mapping to provoke and record arrhythmias to correlate with temperature mapping findings.
`33210`	Insertion of temporary transvenous electrode catheter; for stimulation/recording	May be performed prior to mapping for pacing, sensing, or backup in unstable arrhythmias during the mapping procedure.
`37205`	Transcatheter therapy via percutaneous femoral access, catheter placement for diagnostic procedures	Represents vascular access and catheter placement procedures closely related to the femoral access used for intracardiac mapping.

Related Codes

CPT-93701-CARDIAC-BIOIMPEDANCE-STUDY

CPT 93701: Cardiac Bioimpedance Study

CPT-93702-BIOIMPEDANCE-LYMPHEDEMA-ASSESSMENT

CPT 93702: Bioimpedance Lymphedema Assessment

CPT-93724-PACEMAKER-TACHYCARDIA-ANALYSIS-INTERPRETATION

CPT 93724: Pacemaker Analysis and Tachycardia Simulation

CPT-93745-WEARABLE-CARDIOVERTER-DEFIBRILLATOR-SETUP-PROGRAMMING

CPT 93745: Wearable Cardioverter Defibrillator Setup and Programming

CPT-93750-VENTRICULAR-ASSIST-DEVICE-PROGRAMMING-TESTING

CPT 93750: Ventricular Assist Device Programming and Testing

CPT-93770-INVASIVE-VENOUS-PRESSURE-MONITORING-CRITICAL-ILLNESS

CPT 93770: Invasive Venous Pressure Monitoring in Critical Illness

CPT-93784-AMBULATORY-24-HOUR-BLOOD-PRESSURE-MONITORING-INTERPRETATION

CPT 93784: Ambulatory 24-Hour Blood Pressure Monitoring with Interpretation

CPT-93786-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR

CPT 93786: Ambulatory Blood Pressure Monitoring, 24-Hour

CPT-93788-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR

CPT 93788: Ambulatory Blood Pressure Monitoring, 24-Hour

CPT-93790-AMBULATORY-BLOOD-PRESSURE-MONITORING-24-HOUR-INTERPRETATION

CPT 93790: Ambulatory Blood Pressure Monitoring, 24-Hour Interpretation

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

CPT 93740: Intracardiac Temperature Mapping Diagnostic Procedure

Sign up for cpt 93740 policy alerts

Billing Code Overview

CPT 93740: Intracardiac Temperature Mapping Diagnostic Procedure

Sign up for cpt 93740 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical service does CPT 93740 describe and where is it typically performed?

Which CPT codes are commonly associated with or performed alongside 93740?

Which billing modifiers are relevant to reporting CPT 93740 and when are they used?

What diagnoses are commonly associated with the clinical use of CPT 93740?

Which payers cover CPT 93740 and does the page provide reimbursement rates?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What clinical service does CPT 93740 describe and where is it typically performed?

Which CPT codes are commonly associated with or performed alongside 93740?

Which billing modifiers are relevant to reporting CPT 93740 and when are they used?

What diagnoses are commonly associated with the clinical use of CPT 93740?

Which payers cover CPT 93740 and does the page provide reimbursement rates?

References