Summary & Overview
HCPCS G4035: Thoracic Surgery MIPS Specialty Set
HCPCS Level II code G4035 identifies the thoracic surgery MIPS specialty set, a performance-measurement designation used to organize quality reporting for thoracic surgeons. Nationally, specialty MIPS sets like G4035 matter because they focus quality measurement on clinically relevant procedures and outcomes for a high-acuity surgical population, influencing clinician reporting pathways and performance scores under federal value-based programs. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code represents, the typical clinical and site-of-service context for thoracic surgery performance reporting, and an outline of the topics covered in the full publication: benchmark usage patterns across major payers, comparative policy and coverage notes affecting specialty measure adoption, clinical context for thoracic surgical quality measurement, and implications for billing and reporting workflows. Data gaps from the input are noted where applicable; specific modifier, taxonomy, ICD-10, and related-code details are not included in this summary because they were not provided.
Billing Code Overview
HCPCS Level II code G4035 designates the thoracic surgery MIPS specialty set, a services grouping intended for performance measurement within the Merit-based Incentive Payment System (MIPS) for clinicians practicing thoracic surgery. This code represents a specialty-focused quality/performance reporting construct rather than a discrete billable clinical procedure.
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Service type: Specialty performance measurement set for thoracic surgery
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Typical site of service: Hospital-based and surgical practice settings where thoracic surgeons deliver operative and perioperative care
Clinical & Coding Specifications
Clinical Context
A typical patient is a 64-year-old current or former smoker presenting with progressive dyspnea, hemoptysis, or an incidentally discovered pulmonary nodule on imaging. Thoracic surgery consultation is requested after CT chest and PET imaging suggest a suspicious peripheral lung lesion or mediastinal lymphadenopathy requiring tissue diagnosis or resection. The clinical workflow includes preoperative evaluation (history, physical, cardiopulmonary assessment, pulmonary function testing), multidisciplinary tumor board discussion when cancer is suspected, informed consent, and scheduling for operative intervention such as video-assisted thoracoscopic surgery (VATS) wedge resection, lobectomy, mediastinoscopy, or open thoracotomy. Intraoperative services include anesthesia, surgical resection, possible lymph node sampling, and intraoperative pathology consultation (frozen section). Postoperative care includes immediate recovery in PACU, chest tube management, pain control, postoperative chest radiographs, and discharge planning with follow-up in the thoracic surgery clinic. Billing for performance measurement under the MIPS specialty set G4035 applies to the thoracic surgery clinician group to track quality measures across these episodes of care.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typically required for the service performed (extensive adhesiolysis, unexpected complex dissection). |