Summary & Overview
CPT 00529: Anesthesia for Closed Chest Procedures with One Lung Ventilation
CPT code 00529 covers anesthesia for closed chest procedures such as mediastinoscopy and diagnostic thoracoscopy utilizing one lung ventilation. This code is significant for its role in supporting complex thoracic surgeries, where precise anesthesia management is critical for patient outcomes. The code is commonly billed in hospital operating rooms, both inpatient and outpatient, reflecting its use in advanced surgical settings.
Major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare recognize and reimburse for services billed under CPT code 00529. The publication provides an overview of payer coverage, clinical context, and relevant benchmarks for this anesthesia service. Readers will gain insight into policy updates, typical sites of service, and the importance of accurate coding for anesthesia in thoracic procedures. The summary also highlights associated clinical diagnoses and related procedural codes, offering a comprehensive view of how CPT code 00529 fits within broader surgical and billing practices.
CPT Code Overview
CPT code 00529 is used to report anesthesia services for closed chest procedures, specifically mediastinoscopy and diagnostic thoracoscopy that require one lung ventilation. This code applies to anesthesia provided in the operating room setting, typically within hospital inpatient (POS 21) or outpatient (POS 22) environments. The service type is anesthesia, supporting complex thoracic procedures where specialized ventilation techniques are necessary to facilitate surgical access and patient safety.
Clinical & Coding Specifications
Clinical Context
A patient with a known or suspected mediastinal or thoracic pathology, such as a mass or abnormality, is scheduled for a closed chest procedure in the hospital operating room. The procedure may be a mediastinoscopy or diagnostic thoracoscopy, often requiring one lung ventilation to optimize surgical access and visualization. The anesthesia provider, typically an anesthesiologist or a subspecialist in pediatric anesthesiology or critical care medicine, manages the patient's airway and ventilation, ensuring adequate oxygenation and hemodynamic stability throughout the procedure. The patient may have underlying cardiac conditions such as atherosclerotic heart disease, valvular insufficiency, or heart failure, which are considered during anesthesia planning and monitoring.
Coding Specifications
-
Modifier
QS: Indicates that monitored anesthesia care (MAC) was provided. Used when the anesthesia provider is present and monitoring the patient, but not necessarily administering general anesthesia. -
Modifier
P1: Denotes a normal healthy patient. Used to indicate the physical status of the patient as part of anesthesia coding.
| Modifier Code | Description |
|---|---|
QS | Monitored anesthesia care service |
P1 | A normal healthy patient |
- Provider Taxonomies:
| Taxonomy Code | Specialty |
|---|---|
207L00000X | Anesthesiology |
207LA0401X | Pediatric Anesthesiology |
207LC0200X | Critical Care Medicine (Anesthesiology) |
Related Diagnoses
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I25.10- Atherosclerotic heart disease of native coronary artery without angina pectoris- Indicates underlying coronary artery disease, which may impact anesthesia management during thoracic procedures.
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I34.0- Nonrheumatic mitral (valve) insufficiency- Represents mitral valve dysfunction, relevant for patients undergoing thoracic surgery due to potential cardiac complications.
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I35.0- Nonrheumatic aortic (valve) stenosis- Aortic valve disease may necessitate careful anesthesia planning for thoracic procedures.
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I50.9- Heart failure, unspecified- Heart failure increases perioperative risk and requires specialized anesthesia care.
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Q21.1- Atrial septal defect- Congenital heart defect that may be present in patients undergoing mediastinoscopy or thoracoscopy, affecting anesthesia approach.
Related CPT Codes
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33405- Replacement, aortic valve, with cardiopulmonary bypass- May be performed in patients with aortic valve disease; anesthesia for this procedure may require similar expertise as for mediastinoscopy/thoracoscopy.
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33533- Coronary artery bypass, using arterial graft(s); single arterial graft- Often performed in patients with coronary artery disease; anesthesia services are closely related due to similar patient profiles and surgical settings.
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33208- Insertion of new or replacement of permanent pacemaker with transvenous electrode(s); atrial and ventricular- Relevant for patients with arrhythmias or conduction disorders; anesthesia may be required for device placement.
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92928- Percutaneous transcatheter placement of intracoronary stent(s), with coronary angioplasty when performed; single major coronary artery or branch- Commonly used in interventional cardiology; anesthesia services may be provided for these procedures, especially in complex cases.
These codes are related to 00529 as they represent procedures often performed in similar patient populations or surgical settings. Some may be used together in complex cases, while others serve as alternatives depending on the clinical indication.
National Reimbursement Benchmarks
National mean rates for CPT code 00529 show that commercial payers (BUCA) average $240.94, while Medicare rates are not available in the input. Among individual commercial payers, Cigna has the highest mean rate at $601.13, followed by Blue Cross Blue Shield at $551.40, and Aetna at $334.26. UnitedHealth Group is notably lower at $65.53.
Rate dispersion varies significantly across payers. UnitedHealth Group has the tightest range between the 25th and 75th percentiles ($75.33 - $50.33 = $25.00), indicating less variability in contracted rates. Cigna exhibits the widest spread ($948.50 - $88.00 = $860.50), reflecting substantial variation in reimbursement. The table and chart below present the full breakdown of national benchmarks for each payer.
State Benchmarks
State: AK1 / 50
Alaska Benchmarks
Alaska exhibits a wide rate spread for CPT code 00529, particularly with Blue Cross Blue Shield, where the 75th percentile ($982.67) is substantially higher than the 25th percentile ($566.90), resulting in a spread of $415.77. In contrast, Aetna, Cigna, and UnitedHealth Group show minimal rate variation, with their 25th, 50th, and 75th percentiles clustered closely together. This indicates that Blue Cross Blue Shield has the most variable reimbursement rates among the major payers in Alaska.
Compared to national averages, Blue Cross Blue Shield and Aetna mean rates in Alaska are notably higher, while Cigna and UnitedHealth Group are below their national benchmarks. The table and chart below present the full breakdown of payer-specific rates for Alaska, highlighting these differences and the overall distribution of reimbursement levels.
Key Insights for Alaska
- Blue Cross Blue Shield is the highest paying payer in Alaska for CPT 00529, with a mean rate of $749.67.
- UnitedHealth Group offers the lowest mean rate at $75.12.
- Mean rates for Aetna and Blue Cross Blue Shield in Alaska are significantly higher than their respective national averages, while Cigna and UnitedHealth Group are below national benchmarks.
Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.