Summary & Overview
CPT 94375: Respiratory Flow Volume Loop Study with Spirometry
CPT code 94375 is a critical billing code for respiratory flow volume loop studies, including spirometry with graphic representation and maximal voluntary ventilation. This procedure is a cornerstone of pulmonary diagnostic testing, enabling clinicians to assess lung function and diagnose a range of respiratory conditions such as chronic obstructive pulmonary disease and asthma. The service is typically performed in pulmonary function labs, most often within hospital outpatient departments.
Major national payers covering this code include Aetna, Blue Cross Blue Shield, Cigna Health, Medicare, and UnitedHealthcare. The publication provides a comprehensive overview of payer coverage, clinical context, and relevant billing practices for 94375. Readers will gain insights into benchmarks for utilization, policy updates affecting reimbursement, and the clinical importance of this diagnostic service. The summary also highlights associated modifiers and taxonomies, as well as common ICD-10 diagnoses linked to respiratory testing. This information is essential for understanding the role of 94375 in pulmonary medicine and its impact on patient care and healthcare operations.
CPT Code Overview
CPT code 94375 represents a respiratory flow volume loop study, commonly performed as part of pulmonary diagnostic testing. This procedure includes spirometry with graphic representation and maximal voluntary ventilation, providing detailed assessment of lung function and airflow. The typical site of service for this test is a pulmonary function laboratory, often located in hospital outpatient settings (Place of Service 22). This diagnostic tool is essential for evaluating respiratory conditions and monitoring pulmonary health.
Clinical & Coding Specifications
Clinical Context
A patient presents to a pulmonary function lab, such as a hospital outpatient department, with symptoms including shortness of breath, wheezing, or a history of chronic lung disease. The physician, typically a Pulmonary Disease Physician, Critical Care Medicine Physician, or Interventional Pulmonology Physician, orders a respiratory flow volume loop study to assess lung function. This procedure involves spirometry with graphic representation, including maximal voluntary ventilation, to evaluate airflow and diagnose conditions such as chronic obstructive pulmonary disease or asthma. The test assists in determining the severity and nature of respiratory impairment.
Coding Specifications
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Modifiers:
- Modifier
26: Used when reporting only the professional component of the service (interpretation and report by the physician). - Modifier
TC: Used when reporting only the technical component (performance of the test and provision of equipment).
- Modifier
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Provider Taxonomies:
| Taxonomy Code | Specialty Name |
|---|---|
207RP1001X | Pulmonary Disease Physician |
207RC0200X | Critical Care Medicine Physician |
207RI0008X | Interventional Pulmonology Physician |
These specialties are typically responsible for ordering, performing, and interpreting respiratory flow volume loop studies.
Related Diagnoses
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J44.9: Chronic obstructive pulmonary disease, unspecified- Relevant for patients with chronic airflow limitation, often evaluated with spirometry to assess disease severity.
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J45.909: Unspecified asthma, uncomplicated- Asthma patients may require spirometry to monitor airway obstruction and response to therapy.
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R06.2: Wheezing- Wheezing is a symptom indicating possible airway obstruction, warranting pulmonary function testing.
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R06.00: Dyspnea, unspecified- Unexplained shortness of breath is a common indication for spirometry to evaluate lung function.
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J98.4: Other disorders of lung- Used for patients with less common pulmonary conditions that may affect respiratory mechanics, assessed via spirometry.
Related CPT Codes
94200: Spirometry, including graphic record, total and timed vital capacity, expiratory flow rate measurement(s) (e.g., multiple flow–volume loops)
94200 is related to 94375 as both involve spirometry and graphic representation of respiratory function. 94200 may be used for basic spirometry, while 94375 includes maximal voluntary ventilation and is more comprehensive. These codes may be used together in a clinical workflow when a full assessment of pulmonary function is required, or as alternatives depending on the clinical indication.
National Reimbursement Benchmarks
National mean rates for CPT code 94375 show that Medicare reimburses at $29.17, which is notably lower than the commercial average represented by BUCA at $37.10. Among the major commercial payers, Cigna and UnitedHealth Group offer the highest mean rates, at $43.50 and $41.78 respectively, while Aetna is at the lower end of the commercial spectrum.
Rate dispersion, measured by the difference between the 75th and 25th percentiles, varies across payers. Medicare exhibits the widest spread ($25.50), indicating significant variability in rates. Cigna also shows a wide range ($21.50), while Aetna has the tightest dispersion ($11.25), suggesting more consistent rates nationally. Blue Cross Blue Shield and UnitedHealth Group fall in the middle, with dispersions of $16.39 and $21.67 respectively.
The table and chart below present a detailed breakdown of national benchmarks for each payer, including mean rates and percentile values.
State Benchmarks
State: AK1 / 50
Alaska Benchmarks
Alaska exhibits a wide spread in reimbursement rates for CPT code 94375, with Blue Cross Blue Shield showing the largest range between the 25th and 75th percentiles ($28.38), and Cigna also demonstrating substantial variability ($35.21). In contrast, Aetna and UnitedHealth Group have minimal rate spread, indicating more uniform reimbursement across providers. Compared to national averages, all commercial payers in Alaska offer considerably higher mean rates, with Blue Cross Blue Shield and UnitedHealth Group standing out for their elevated payments relative to their national benchmarks.
The table and chart below present the full breakdown of mean rates and percentile distributions for each payer in Alaska, highlighting the differences in reimbursement levels and variability across the major insurers and Medicare.
Key Insights for Alaska
- Blue Cross Blue Shield is the highest paying payer for CPT 94375 in Alaska, with a mean rate of $76.40.
- Medicare is the lowest paying payer in Alaska, with a mean rate of $28.17, notably below the commercial payers.
- All commercial payers in Alaska reimburse at rates significantly above their respective national averages, with BCBS and UnitedHealth Group showing the largest deviations.
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