Summary & Overview
CPT 43631: Partial Gastrectomy with Gastroduodenostomy
CPT code 43631 represents a partial gastrectomy with gastroduodenostomy—excision of diseased stomach tissue and reconnection of the stomach remnant to the duodenum to preserve continuity of the digestive tract. This operation is principally used in the surgical management of gastric cancer and other indications requiring removal of part of the stomach. Nationally, the code is relevant to hospital-based surgical services, resource utilization for major abdominal surgery, and postoperative care pathways.
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 payer coverage landscape. The publication also provides benchmarks commonly used in surgical billing reviews, coding guidance considerations, and policy updates that affect coverage and documentation standards. Clinicians and billing professionals will gain insight into appropriate use cases for the code, expected resource intensity, and factors that influence payer adjudication of inpatient surgical claims.
Data not available in the input for specific modifiers, associated taxonomies, ICD-10 diagnoses, and related codes is noted where applicable elsewhere in the publication.
Billing Code Overview
CPT code 43631 describes a surgical procedure in which the provider excises the diseased portion of the stomach and reconnects the remnant of the stomach to the duodenum to maintain an uninterrupted digestive tract. This procedure is typically performed for patients with gastric cancer or other conditions requiring partial gastrectomy with primary reconstruction.
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Service type: Major open or minimally invasive abdominal surgery for resection of gastric tissue and reconstruction (partial gastrectomy with gastroduodenostomy).
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Typical site of service: Inpatient hospital operating room, frequently requiring postoperative inpatient care.
Clinical & Coding Specifications
Clinical Context
A 64-year-old male presents with progressive epigastric pain, early satiety, unintentional weight loss, and an upper endoscopy showing an ulcerated mass in the distal stomach. Biopsy confirms adenocarcinoma of the gastric antrum. Preoperative staging with CT chest/abdomen/pelvis shows a localized tumor without distant metastasis. The surgical oncology team schedules an elective distal gastrectomy with primary reconstruction via gastroduodenostomy (Billroth I) to remove the diseased portion of the stomach and restore continuity of the gastrointestinal tract. The patient is admitted to an acute care hospital for preoperative evaluation, general anesthesia is provided by an anesthesiologist, and the procedure is performed in the operating room by a surgical oncologist or general surgeon. Postoperative care includes inpatient monitoring for hemodynamic stability, pain control, early ambulation, bowel function assessment, and discharge planning with outpatient oncology follow-up for adjuvant therapy decisions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier on file / default | Rarely reported; some payors use as a system placeholder. |
11 | Active/regular physician | When reporting the surgeon as the primary performing physician (often default). |
22 | Increased procedural services | When intraoperative complexity significantly increases work (extensive adhesiolysis, unexpected findings). |
52 | Reduced services | When a planned gastrectomy is partially performed or aborted with reduced work. |
53 | Discontinued procedure | If the operation is started but terminated for patient safety before completion. |
62 | Two surgeons | When two qualified surgeons perform distinct portions of the gastrectomy due to complexity. |
63 | Procedure performed on infants (<4kg) | Rarely applicable; only used if patient size/age criteria met. |
78 | Unplanned return to operating room within global period | For a return to OR related to the initial gastrectomy during the global period. |
80 | Assistant surgeon | When a qualified assistant provides surgical assistance. |
81 | Minimum assistant surgeon | When a trainee or assistant provides minimal assistance as defined by payor rules. |
82 | Assistant surgeon (unusual circumstance) | When qualified assistant is not available and an assistant is necessary under unusual circumstances. |
58 | Staged or related procedure or procedure during postoperative period | When the gastrectomy is planned as part of a staged treatment. |
26 | Professional component | If reporting only the physician’s professional component for a service with a technical component (rare for operative codes). |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207P00000X | General Surgery | Most common specialty performing gastrectomy for malignancy. |
2080P0007X | Surgical Oncology | Surgeons with focus on oncologic resections often perform this procedure. |
207L00000X | Thoracic Surgery | May be involved if combined esophagogastric resections are required. |
2086S0127X | Transplant Surgery | Occasionally involved in complex upper abdominal resections and reconstructions. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
C16.2 | Malignant neoplasm of body of stomach | Common location for distal gastrectomy when tumor involves gastric body. |
C16.1 | Malignant neoplasm of fundus of stomach | Tumors in proximal stomach may alter extent of resection; relevant for surgical planning. |
C16.4 | Malignant neoplasm of distal (antrum) of stomach | Typical indication for distal/subtotal gastrectomy with gastroduodenostomy. |
C16.0 | Malignant neoplasm of cardia | May require extended resection; influences reconstruction choice. |
D37.4 | Neoplasm of uncertain behavior of stomach | Sometimes prompts surgical excision when malignancy cannot be excluded. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
43842 | Partial gastrectomy, distal subtotal (e.g., Billroth I or II) with gastrojejunostomy | Alternative reconstruction option (Billroth II) when gastroduodenostomy is not feasible during distal gastric resections. |
43632 | Gastric resection with reconstruction, other techniques (e.g., gastrojejunostomy) | Related procedure code for subtotal gastrectomy with different reconstructive approach. |
99223 | Initial hospital care, high severity | Typical inpatient evaluation and management on the day of surgery for complex surgical patients. |
99100 | Anesthesia for procedures on the abdominal region (example) | Represents the anesthesia services typically reported by anesthesiology for a major abdominal operation. |
43845 | Revision of gastroenterostomy | May be used if postoperative complication requires revision of the reconstructive anastomosis. |