Summary & Overview

CPT 43810: Gastroduodenal Anastomosis — Stomach to Duodenum Surgical Connection

CPT code 43810 identifies a gastroduodenal anastomosis, an open surgical procedure that forms a connection between the stomach and the duodenum, typically after partial gastrectomy or duodenal resection. Nationally, this code captures complex gastrointestinal reconstructive surgery that can affect inpatient surgical utilization, resource allocation, and postoperative care pathways.

Key payers addressed in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The report provides a clinical and billing context for hospitals and surgical specialists, highlighting where CPT code 43810 fits within surgical service lines and common billing frameworks.

Readers will find: benchmarks and utilization context for inpatient gastrointestinal surgery; policy and coverage considerations relevant to major commercial payers and Medicare; and clinical context describing indications and typical care settings. Data limitations are noted where input fields were not provided. This summary is intended for national stakeholders involved in surgical services, revenue integrity, and payer policy.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 43810gastroduodenal anastomosisgastrointestinal surgeryinpatient surgerysurgical billingoperative procedurehospital service line

Billing Code Overview

CPT code 43810 describes a gastroduodenal anastomosis — a surgical procedure that creates a direct connection between the stomach and the duodenum, typically performed after resection of part of the stomach or duodenum. This operation restores gastrointestinal continuity and is often part of procedures addressing malignancy, benign lesions, trauma, or complications of prior surgery.

Service type: Open abdominal gastrointestinal surgical procedure
Typical site of service: Hospital operating room or inpatient surgical unit

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with a history of peptic ulcer disease complicated by gastric outlet obstruction undergoes evaluation for progressive vomiting, weight loss, and failure to thrive. Imaging and endoscopy demonstrate a distal gastric stenosis with nonhealing ulceration and partial gastric resection is planned. In the operating room under general anesthesia, the surgical team performs a partial gastrectomy with creation of a 43810 gastroduodenal anastomosis (surgical connection between the stomach and the duodenum) to restore continuity of the gastrointestinal tract. The typical workflow includes preoperative evaluation (medical clearance, informed consent, antibiotic prophylaxis), induction of anesthesia, exploratory laparotomy or laparoscopic assistance, resection of diseased gastric tissue if indicated, handsewn or stapled gastroduodenostomy, assessment for hemostasis and anastomotic integrity, placement of drains if needed, and transfer to post-anesthesia care unit for monitoring. Postoperative care involves analgesia, nausea control, early mobility, gradual advancement of diet, and monitoring for complications such as leak, bleeding, or delayed gastric emptying.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard reporting	Use when no special circumstance applies and routine reporting is appropriate.
`11`	Office or other outpatient service — rarely used on surgical codes	Use only if reporting a minor procedure in an outpatient/office setting consistent with payer rules.
`22`	Increased procedural services	Use when the work, time, or intensity is substantially greater than typically required for `43810`.
`23`	Unusual anesthesia	Use when a procedure normally done with local anesthesia requires general anesthesia because of unusual circumstances.
`52`	Reduced services	Use when a planned gastroduodenostomy is partially reduced or not completed as originally intended.
`53`	Discontinued procedure	Use when the procedure is started but terminated due to extenuating circumstances prior to completion of `43810`.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons performing portions of the gastroduodenal anastomosis.
`66`	Surgical team	Use when a surgical team approach (multiple surgeons with defined roles) is required.
`78`	Unplanned return to operating room for a related procedure during the postoperative period	Use if the patient returns to the OR for an anastomotic revision or control of postoperative hemorrhage related to `43810`.
`79`	(Not in provided list)	Data not available in the input.

Taxonomy Code	Specialty	Notes
`334B00000X`	General Surgery	Most common specialty performing gastroduodenal anastomosis after gastric or duodenal resection.
`207L00000X`	Surgical Oncology	Performed when malignant gastric or duodenal disease necessitates resection and reconstruction.
`2080S0010X`	Thoracic & Cardiac Surgery (limited role)	Rarely involved for proximal gastric procedures extending toward the gastroesophageal junction.
`2084P0800X`	Gastroenterology (interventional)	Typically not performing open anastomosis but involved in preoperative diagnostics and post-op endoscopic evaluation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K31.2`	Ulcer of stomach, chronic or unspecified	Chronic gastric ulceration may necessitate resection and gastroduodenal anastomosis when causing obstruction or nonhealing disease.
`K31.7`	Dieulafoy lesion of stomach and duodenum	Significant bleeding lesions occasionally require surgical resection and reconstruction including gastroduodenostomy.
`K57.50`	Diverticulosis of small intestine without perforation or abscess	Although uncommon, small bowel pathology adjacent to the duodenum may necessitate reconstruction; included for completeness.
`C16.9`	Malignant neoplasm of stomach, unspecified	Gastric cancer often requires partial gastrectomy with gastroduodenal reconstruction when tumor location permits.
`K91.83`	Postprocedural malabsorption	Postoperative complications following gastric resection and anastomosis can include malabsorption syndromes requiring monitoring.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`43246`	Esophagogastroduodenoscopy, flexible, diagnostic, with or without collection of specimen(s) by brushing or washing (EGD)	Preoperative diagnostic endoscopy to evaluate cause and extent of gastric outlet obstruction prior to gastroduodenostomy.
`43620`	Gastrectomy, partial, distal subtotal, with or without duodenal or other anastomosis; with reconstruction (e.g., Billroth)	Alternative or accompanying resection code when partial gastrectomy is performed with reconstruction; `43810` describes the anastomosis specifically.
`44120`	Enterolysis (lysis of adhesions), small intestine	May be performed intraoperatively if dense adhesions are encountered prior to performing `43810`.
`49422`	Insertion of temporary external drainage device, percutaneous or open, for postoperative drainage	Used when drains are placed at the time of gastroduodenostomy for postoperative management.
`99231`	Subsequent hospital care, per day, for evaluation and management	Used for daily postoperative inpatient evaluation following `43810` by the attending surgeon.