Summary & Overview
CPT 43633: Partial Gastrectomy with Small Bowel Anastomosis
CPT code 43633 denotes a partial gastrectomy in which the lower stomach is removed and the upper small intestine is anastomosed to the remaining stomach. As a major abdominal operation, it is performed for several clinical indications such as peptic ulcer disease complications, malignancy, or other structural pathology requiring gastric resection and reconstruction. The code matters nationally because it represents a high-acuity inpatient surgical service with implications for operative resource use, postoperative care needs, and payer reimbursement patterns.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and which payers are relevant for coverage and billing workflows. The publication outlines benchmarks and common billing considerations, clarifies coding descriptors, and summarizes policy updates that affect authorization and inpatient billing for major gastrointestinal surgery.
This resource is intended for billing managers, surgical service line leaders, and payer relations teams seeking a national overview of CPT code 43633 and its clinical and administrative context.
Billing Code Overview
CPT code 43633 describes a surgical procedure in which the lower part of the stomach is removed and the upper small bowel is anastomosed to the remaining stomach. This procedure is a form of partial gastrectomy with reconstruction of gastrointestinal continuity.
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Service type: Major abdominal surgical procedure (open or laparoscopic partial gastrectomy with gastrojejunostomy or gastroduodenostomy reconstruction)
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Typical site of service: Inpatient hospital surgical setting (operating room with inpatient postoperative care)
Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and specific service line.
Clinical & Coding Specifications
Clinical Context
A typical patient is a 55–70 year-old with symptomatic peptic ulcer disease complicated by gastric outlet obstruction, refractory nonhealing gastric ulcer, or distal gastric malignancy where subtotal gastrectomy with gastrojejunostomy is indicated. The workflow begins with outpatient evaluation for persistent epigastric pain, nausea, vomiting, weight loss, or anemia. Diagnostic workup includes upper endoscopy with biopsy, abdominal CT scan, and preoperative medical optimization. The patient is admitted on the day of surgery to an inpatient surgical service. The operative procedure involves resection of the distal stomach (antrectomy or distal subtotal gastrectomy), creation of a gastrojejunostomy (Billroth II) or Roux-en-Y reconstruction as appropriate, hemostasis, and layered closure. Postoperative care includes monitoring in PACU, inpatient pain control, DVT prophylaxis, early ambulation, gradual advancement of diet, and discharge planning with follow-up for pathology results and nutrition counseling.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the procedure required substantially greater work than typical (extensive adhesiolysis, complex reconstruction). |
52 | Reduced services |