CPT 94726 Pulmonary Function Test Reimbursement

CPT code 94726 represents comprehensive pulmonary function testing to measure lung volumes (total lung capacity, residual volume, functional residual capacity) and may include airway resistance assessment. These physiologic measurements inform diagnosis and management of restrictive and obstructive lung disease and are commonly performed in outpatient or hospital-based pulmonary function laboratories. Nationally, PFTs are essential for monitoring chronic respiratory conditions, preoperative risk assessment, and occupational or disability evaluations.

Key payers analyzed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, typical payer coverage considerations, common modifiers in use, and related billing guidance. The publication outlines benchmarks for utilization and reimbursement where available, highlights recent policy updates affecting coverage and documentation, and summarizes coding nuances specific to lung volume and airway resistance testing.

This resource is intended for billing managers, pulmonologists, respiratory therapists, and health policy analysts seeking a national-level summary of CPT code 94726, its clinical purpose, and practical billing context. Data not available in the input will be noted where applicable.

Billing Code Overview

CPT code 94726 describes a pulmonary function test (PFT) to measure lung volumes, including total lung capacity, residual volume, and functional residual capacity. The procedure may also include assessment of airway resistance. This evaluation quantifies static lung volumes and resistance to airflow to aid in diagnosis and management of restrictive and obstructive lung diseases.

Service Type: Pulmonary function testing—lung volumes and airway resistance measurement

Typical Site of Service: Outpatient pulmonary function laboratory, hospital pulmonary function lab, or ambulatory care center

Clinical Context

A 58-year-old patient with a history of chronic obstructive pulmonary disease (COPD) and progressive exertional dyspnea is referred by a primary care physician to a pulmonary function laboratory for comprehensive lung volume testing. The patient arrives at an outpatient pulmonary clinic or hospital-based pulmonary function lab. After check-in and consent, a respiratory therapist reviews the medical history, medication use (including bronchodilators), and recent acute illnesses. Baseline spirometry is performed first; if results indicate restriction, obstruction, or unclear physiology, the provider orders full pulmonary function testing including lung volumes (total lung capacity, residual volume, functional residual capacity) and airway resistance measurements. The test is conducted using plethysmography or gas dilution techniques per lab protocol. Quality control checks and technician coaching occur throughout. The interpreting pulmonologist reviews the tracing, documents findings, and integrates results with clinical assessment to guide management decisions such as bronchodilator responsiveness testing, referral for rehabilitation, or adjustment of therapy. Typical sites of service include outpatient pulmonary function laboratories, hospital pulmonary labs, and ambulatory care centers where PFT equipment and trained personnel are available.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the physician interpretation/report is billed separately from the technical component of the test.

Taxonomy Code	Specialty	Notes
207RP1000X	Pulmonary Disease	Pulmonologists interpret PFTs and direct testing strategy.
2080P0207X	Allergy & Immunology	Specialists who evaluate airway disease and may order PFTs for airway reactivity and lung function assessment.
3336C0003X	Respiratory Care	Respiratory therapists and pulmonary function technologists perform testing and ensure quality control.
207K00000X	Internal Medicine	Primary care internists frequently order and review PFTs in chronic lung disease management.
2084P0800X	Critical Care Medicine	Intensivists may order baseline or monitoring PFTs in select ambulatory follow-up contexts.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J44.9`	Chronic obstructive pulmonary disease, unspecified	COPD patients undergo lung volume testing to quantify air trapping and restrictive components.
`J45.909`	Unspecified asthma, uncomplicated	PFTs assess reversible airway obstruction and guide asthma management.
`J84.10`	Pulmonary fibrosis, unspecified	Lung volumes and DLCO help evaluate restrictive lung disease and severity.
`R06.02`	Shortness of breath	Symptom prompting PFTs to determine underlying obstructive or restrictive physiology.
`I27.20`	Pulmonary hypertension, unspecified	PFTs assist in evaluating lung disease contribution to pulmonary vascular disease and in differential diagnosis.
`J98.11`	Atelectasis	PFTs can document functional impairment related to volume loss or ventilation defects.
`Z87.01`	Personal history of nicotine dependence	Smoking history is relevant to interpretation of PFT results and disease etiology.
`M32.9`	Systemic lupus erythematosus, uncomplicated	Connective tissue disease patients may receive PFTs to screen for interstitial lung involvement.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`94010`	Measurements of ventilatory function, respiratory mechanics, lung volumes and gas exchange, multiple spirometric determinations, with or without maximal respiratory pressures	Performed alongside or as a component of comprehensive lung physiology testing; may represent specific measurements included in a full PFT battery.
`94070`	Bronchospasm evaluation, spirometry with bronchodilator administration and post-bronchodilator spirometry	Often performed before or after lung volumes to assess bronchodilator responsiveness and differentiate reversible obstruction.
`94729`	Diffusing capacity (eg, DLCO), single-breath technique	Commonly ordered with lung volumes to assess gas transfer across the alveolar-capillary membrane for emphysema, interstitial lung disease, or pulmonary vascular disease evaluation.
`94620`	Pulmonary stress testing; spirometry, including exercise testing	Performed in patients with exertional dyspnea to evaluate exercise-induced airway limitation; may follow baseline PFTs.
`94640`	Inhalation treatment for acute airway obstruction; administration of nebulized bronchodilator	May be provided in the same visit if bronchodilator therapy is required based on PFT findings or patient symptoms post-testing.
`G0237`	Home spirometry training for patients requiring home monitoring ( HCPCS )	May be relevant in outpatient care plans when PFTs identify chronic impairment requiring home monitoring.

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Summary & Overview

CPT 94726: Pulmonary Function Test for Lung Volumes and Airway Resistance