Summary & Overview
CPT 33904: Pulmonary Artery Stent Placement, Add-On Service
CPT code 33904 is an add-on code for endovascular stent placement in the pulmonary arteries, reported when one or more additional stents are deployed beyond the primary vessel or lesion during the same encounter. This code captures incremental procedural work and device-based intervention for pulmonary artery stenosis or related vascular lesions and is relevant for facilities and clinicians billing complex interventional cardiothoracic and interventional radiology services. Nationally, accurate use of this code affects case mix reporting, reimbursement bundling, and quality measurement for pulmonary vascular interventions.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find: a concise explanation of the clinical and billing intent of the code; typical settings where the service is delivered; common modifiers associated with procedural reporting (input provided); and guidance on where data were not available in the input. The publication outlines benchmarks and payment-policy considerations where available, clarifies the code’s role as an add-on service, and provides clinical context for when additional stents would be reported. Data not available in the input are explicitly noted for items such as associated taxonomies, ICD-10 diagnoses, related codes, and payer-specific fee schedules.
Billing Code Overview
CPT code 33904 describes an add-on endovascular stent placement procedure in the pulmonary arteries. The procedure involves advancing stents via normal or abnormal vascular connections to expand narrowed segments of a pulmonary artery, and is reported when one or more additional stents are placed in vessels or lesions beyond the primary lesion treated during the same encounter.
Service type: Endovascular pulmonary artery stent placement (add-on service)
Typical site of service: Hospital-based catheterization lab or interventional radiology suite, with procedures commonly performed in settings equipped for endovascular interventions and cardiothoracic monitoring.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult or pediatric patient referred for transcatheter pulmonary artery stent placement to treat focal or diffuse pulmonary artery stenosis causing right ventricular pressure overload, hypoxemia, or differential pulmonary blood flow. The workflow begins with pre-procedure evaluation including history, echocardiography, and cross-sectional imaging (CT or MRI) or cardiac catheterization hemodynamics showing a significant gradient across the stenotic segment. The patient is scheduled for an interventional cardiology or cardiothoracic catheterization suite procedure under general anesthesia or monitored anesthesia care. Vascular access is obtained (commonly via femoral venous access), selective angiography confirms lesion anatomy, and balloon angioplasty may be performed followed by deployment of one or more stents to expand the narrowed pulmonary artery segment. 33904 is an add-on code reported when one or more additional stents are placed in vessels or lesions beyond the primary vessel/lesion treated during the same session. Post-deployment angiography confirms flow and absence of complications. Typical post-procedure care includes hemodynamic observation, telemetry, anticoagulation/antiplatelet management as indicated, and follow-up imaging or echocardiography to assess stent position and gradient.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Used when no modifier applies; carriers rarely require explicit 00 reporting but it is listed in the dataset. |
22 | Increased procedural services | When the stent placement required substantially greater effort, time, or complexity than typical (documented). |
23 | Unusual anesthesia | When the procedure is performed with general anesthesia in an otherwise local/regional setting due to extenuating circumstances (document clinical justification). |
50 | Bilateral procedure | Not commonly applicable to pulmonary arteries but used when procedures are performed in paired organs or vessels; rarely applicable. |
52 | Reduced services | When part of the planned procedure is omitted or only partially performed (document reason). |
53 | Discontinued procedure | If the procedure is started but terminated due to patient instability or unforeseen circumstances. |
62 | Two surgeons | When two surgeons work together as primary surgeons during the procedure (document roles). |
63 | Procedure performed on infants less than 4 kg | Applied when modifiers specific to infant weight are required by payer policy. |
78 | Return to OR for related procedure during postoperative period | If the patient returns to the operating room for a related pulmonary artery intervention during the global period. |
79 | Unrelated procedure or service during global period | Use when a separate unrelated procedure is performed during the global period (note: 79 is not listed in the input modifiers; excluded). |
80 | Assistant surgeon | When an assistant surgeon is required and documented. |
81 | Minimum assistant surgeon | When a minor assistant role is documented and allowed by payer. |
82 | Assistant surgeon (when qualified resident not available) | Use when an assistant surgeon is required because no qualified resident is available. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist service | When services are furnished by an assistant clinician as defined by payer. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207RP0000X | Interventional Cardiology | Physicians who perform transcatheter pulmonary artery interventions. |
| 208000000X | Cardiothoracic Surgery | Surgeons who may perform hybrid or surgical-assisted stent placement. |
| 2084P0800X | Pediatric Cardiology | Specialists performing pulmonary artery stenting in pediatric patients. |
| 363L00000X | Vascular Surgery | May be involved in hybrid or complex endovascular pulmonary artery procedures. |
| 208D00000X | Diagnostic Radiology (Interventional Radiology) | Interventional radiologists who perform endovascular stent placements in select centers. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
I27.22 | Pulmonary artery stenosis | Direct indication for pulmonary artery stent placement to relieve obstruction and reduce right ventricular pressure. |
Q25.3 | Pulmonary valve stenosis | May coexist with peripheral pulmonary artery stenosis; stenting can address branch lesions post valve intervention. |
Q25.0 | Congenital pulmonary valve atresia | Patients with complex congenital heart disease may require branch pulmonary artery stenting as part of staged palliation. |
I26.9 | Pulmonary embolism, unspecified | Chronic thromboembolic disease can cause focal stenosis; stenting may be considered in selected chronic cases. |
I51.9 | Heart disease, unspecified | Used when specific congenital or acquired pulmonary vascular disease has not been fully classified but intervention is required. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
93580 | Transcatheter placement of intracoronary stent(s), with coronary angioplasty when performed; single major coronary artery or branch | Data not available in the input. |
93637 | Pulmonary artery pressure monitoring, right heart catheterization including measurement(s) and transcatheter device placement when performed | Often performed before or during pulmonary artery interventions for hemodynamic assessment. |
93458 | Catheter placement in pulmonary artery for angiography, radiography, and pressure measurement | Performed to delineate lesion anatomy and pressures during stent planning. |
32557 | Tube thoracostomy, includes water-seal connection and drainage, when performed | May be performed post-procedure for complications such as pneumothorax (rare). |
33249 | Insertion of transvenous right ventricular pacing lead, replacement, and subcutaneous generator; without subcutaneous tunneling | Data not available in the input. |