88740 Transcutaneous Carboxyhemoglobin CPT Reimbursement

CPT code 88740 denotes a quantitative, transcutaneous measurement of carboxyhemoglobin performed by an analyst to assess carbon monoxide exposure without invasive sampling. Nationally, noninvasive carboxyhemoglobin testing supports timely triage in emergency, occupational, and outpatient settings and can influence decisions about observation or therapy. This code is reported once per day per patient.

Key payers covered 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 transcutaneous carboxyhemoglobin testing, the typical sites of service where this procedure is delivered, and the operational note that the code is reportable once daily. The publication outlines common billing modifiers associated with this service (input provided), notes where data are unavailable, and identifies areas for coding clarity.

This summary is intended for a national audience of coding professionals, clinical administrators, and policy analysts seeking a clear reference on CPT code 88740, including its clinical purpose, reporting frequency, and payer relevance.

Billing Code Overview

CPT code 88740 describes a quantitative, transcutaneous procedure performed by an analyst to evaluate carboxyhemoglobin levels through the skin. This service represents a noninvasive measurement technique used to estimate carbon monoxide exposure by assessing carboxyhemoglobin concentration without blood draw.

Service type: Quantitative transcutaneous carboxyhemoglobin measurement
Typical site of service: Outpatient clinics, emergency departments, occupational health clinics, and other point-of-care settings where noninvasive toxicology assessment is indicated

Data not available in the input.

Clinical Context

A 45-year-old firefighter presents to the emergency department after being rescued from a structure fire with potential smoke inhalation. The patient reports headache, nausea, and dizziness. Pulse oximetry is unreliable for detecting carbon monoxide exposure. The clinician orders a transcutaneous carboxyhemoglobin measurement to rapidly quantify carboxyhemoglobin levels and guide decisions about supplemental oxygen versus hyperbaric oxygen therapy. A respiratory therapist or clinical laboratory analyst performs the noninvasive transcutaneous quantitative procedure, documents the measured carboxyhemoglobin value in the medical record, and the result is reported once for that calendar day using 88740. The typical site of service is the emergency department, inpatient hospital unit, or burn center where rapid, repeated noninvasive monitoring may be needed to track response to therapy.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional component of a split-billed service if applicable (rare for transcutaneous measurement).
`52`	Reduced services

Taxonomy Code	Specialty	Notes
207Q00000X	Emergency Medicine	ED physicians commonly order and interpret transcutaneous carboxyhemoglobin measurements.
207RC0000X	Anesthesiology	Anesthesiologists may use carboxyhemoglobin monitoring in perioperative or critical care settings.
207L00000X	Pulmonary Disease	Pulmonologists manage smoke inhalation and CO exposure and interpret serial measurements.
3336C0000X	Clinical Laboratory	Clinical laboratory technicians/analysts perform and report quantitative transcutaneous measurements.
363A00000X	Respiratory Care	Respiratory therapists perform noninvasive monitoring and document values.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`T58.XXA`	Toxic effect of carbon monoxide, accidental, initial encounter	Direct diagnosis indicating carbon monoxide exposure prompting carboxyhemoglobin measurement.
`T58.XXD`	Toxic effect of carbon monoxide, accidental, subsequent encounter	Used for follow-up encounters where repeat measurement may be performed.
`T58.XXS`	Toxic effect of carbon monoxide, accidental, sequela	Used for late effects; measurement may be part of evaluation of persistent symptoms.
`T59.8XXA`	Toxic effect of other gases, fumes and vapors, initial encounter	Applied when smoke or mixed inhalation exposures are suspected and screening for CO is indicated.
`J68.0`	Bronchitis and pneumonitis due to chemicals, gases, fumes and vapors	Relevant when inhalation injury from smoke accompanies CO exposure; clinicians may measure carboxyhemoglobin to assess contribution of CO to respiratory compromise.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`94760`	Noninvasive ear or pulse oximetry for oxygen saturation (per encounter)	Often performed concurrently to assess oxygenation though pulse oximetry cannot detect carboxyhemoglobin; used for complementary monitoring.
`94799`	Unlisted pulmonary service or procedure	May be reported when a specific device or method for transcutaneous measurement lacks a dedicated code (use only when appropriate).
`36415`	Collection of venous blood by venipuncture	Performed if a venous blood sample is obtained for laboratory carboxyhemoglobin by blood gas or co-oximetry as a confirmatory test.
`82803`	Carboxyhemoglobin test, blood (quantitative)	Laboratory measurement of carboxyhemoglobin from blood sample used to confirm and quantify CO exposure; complements transcutaneous `88740`.
`99000`	Handling and/or conveyance of specimen for transfer to another facility (if applicable)	Used when specimen transfer is needed for reference lab testing that complements transcutaneous measurement.

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Summary & Overview

CPT 88740: Transcutaneous Quantitative Carboxyhemoglobin Measurement