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CPT 43605: Open Biopsy and Excision of Gastric Lesion

CPT code 43605 denotes an open surgical biopsy with excision of a stomach lesion to obtain tissue for pathological diagnosis. Nationally, this code is used when endoscopic approaches are not feasible or when a larger or deeper specimen is required for definitive histologic assessment. It matters for hospitals and surgical practices because it captures resource use, operative complexity, and pathology-directed diagnostic care for potentially malignant gastric lesions.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for use of this surgical biopsy code, typical settings where the service is performed, and how it fits into diagnostic workflows for suspected gastric neoplasms. The publication also summarizes benchmarking considerations and common billing modifiers used with operative services (when available) and highlights coding relationships relevant to surgical and pathology billing.

This summary is intended for a national audience of coding professionals, surgical providers, and payer policy staff seeking clear clinical and billing context for CPT code 43605. Data not available in the input will be noted where relevant in subsequent sections.

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Billing Code Overview

CPT code 43605 describes an open biopsy with excision of a gastric lesion, in which a surgeon removes a portion or all of a suspicious lesion from the stomach to establish its origin and nature (for example, to distinguish malignant from benign tissue). This procedure is a surgical diagnostic service performed to obtain tissue for pathological examination.

Service type: Open surgical biopsy and excision of stomach lesion
Typical site of service: Hospital operating room or surgical center

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CPT 43605: Open Biopsy and Excision of Gastric Lesion

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Billing Code Overview

Service type: Open surgical biopsy and excision of stomach lesion
Typical site of service: Hospital operating room or surgical center

Clinical & Coding Specifications

Clinical Context

A 62-year-old patient presents with persistent upper abdominal pain and unintentional weight loss. Endoscopic evaluation identifies a suspicious gastric mass not amenable to complete endoscopic removal. After multidisciplinary review, the surgeon schedules an open surgical biopsy with excision of part of the lesion to establish histopathologic diagnosis and rule out malignancy. The perioperative workflow includes preoperative imaging (CT abdomen), informed consent documenting diagnostic intent, standard pre-op labs, general anesthesia, open laparotomy or limited incision to access the stomach, excisional biopsy of the lesion with hemostasis, specimen submission to pathology, and postoperative monitoring for bleeding, infection, and return of bowel function. Typical site of service is an inpatient or ambulatory hospital operating room. The service type is an open surgical diagnostic/excisional procedure of the stomach to determine lesion origin (benign versus malignant).

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work or complexity substantially exceeds typical for the procedure due to factors such as extensive adhesions or difficult dissection.
`23`	Unusual anesthesia	Use when procedure is performed under general anesthesia but circumstances create medically necessary conditions for increased risk (e.g., patient intolerance to standard sedation).
`26`	Professional component	Use when reporting only the surgeon's professional component separate from facility technical component (rare for operative procedures).
`50`	Bilateral procedure	Use if the procedure is performed on bilateral gastric sites (rare; modifier included for applicability).
`51`	Multiple procedures	Use when additional distinct procedures are performed during the same operative session and payer requires multiple-procedure reporting.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally intended.
`53`	Discontinued procedure	Use when procedure is started but terminated due to extenuating circumstances prior to completion.
`62`	Two surgeons	Use when two surgeons of different specialties work together as primary surgeons perform distinct portions of the operation.
`78`	Unplanned return to OR	Use for an unplanned return to the operating room within the global period for a related procedure.
`79`	(Not listed in provided modifiers)	Data not available in the input.

Taxonomy Code	Specialty	Notes
`408600000X`	General Surgery	Most common specialty performing open gastric biopsies and excisions.
`207L00000X`	Colorectal Surgery	May perform abdominal access and gastric procedures in complex cases.
`208000000X`	Gastroenterology	Involved in diagnosis and preoperative endoscopic assessment; endoscopic biopsies precede surgical biopsy.
`2086S0105X`	Surgical Oncology	Performs oncologic resections and diagnostic excisional biopsies when malignancy suspected.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C16.9`	Malignant neoplasm of stomach, unspecified	Primary concern when a suspicious gastric lesion is found; open biopsy may be required for diagnosis and staging.
`D37.4`	Neoplasm of uncertain or unknown behavior of stomach	Lesions of uncertain behavior often require excisional or open biopsy to determine malignancy.
`K31.0`	Chronic atrophic gastritis	Chronic gastric disease can be associated with mucosal lesions and may prompt biopsy when suspicious areas are identified.
`K29.70`	Gastritis, unspecified, without bleeding	Gastritis with atypical appearing lesions may require biopsy to exclude neoplasm.
`R19.7`	Diarrhea, unspecified	Nonspecific GI symptoms that may accompany gastric pathology prompting diagnostic evaluation, including biopsy.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`43239`	Esophagogastroduodenoscopy, flexible, transoral; with biopsy, single or multiple	Often performed before open biopsy for endoscopic assessment and tissue sampling; may precede open excisional biopsy when endoscopic sampling is inadequate.
`49080`	Exploratory laparotomy, exploratory celiotomy with biopsy(s) of intra-abdominal organs (separate procedure)	Related intra-abdominal exploratory approaches can be used when broader abdominal exploration is required in conjunction with gastric biopsy.
`88305`	Pathology examination, surgical pathology, intermediate complexity (e.g., gross and microscopic examination)	Typical pathology CPT code for histologic examination of gastric biopsy specimens sent by the surgeon.
`99223`	Initial hospital care, typically 70 minutes or more	Preoperative or immediate postoperative inpatient evaluation and management associated with major surgery.
`47562`	Laparoscopy, surgical, gastric procedures (example), when performed	Minimally invasive gastric procedures may be performed instead of open biopsy when feasible; included for workflow context.

CPT 43610: Surgical Exploration of Stomach with Lesion Excision

CPT-43611-GASTRIC-TUMOR-EXCISION-SURGICAL-ONCOLOGY

CPT 43611: Excision of Cancerous Stomach Tumor

CPT-43620-ESOPHAGOENTEROSTOMY-AFTER-GASTRECTOMY

CPT 43620: Esophagoenterostomy After Gastrectomy

CPT-43621-TOTAL-GASTRECTOMY-SMALL-BOWEL-ANASTOMOSIS

CPT 43621: Total Gastrectomy with Small-Bowel Anastomosis

CPT-43622-TOTAL-GASTRECTOMY-ESOPHAGODUODENAL-POUCH-RECONSTRUCTION

CPT 43622: Total Gastrectomy with Esophagoduodenal Pouch Reconstruction

CPT-43631-PARTIAL-GASTRECTOMY-GASTRODUODENOSTOMY

CPT 43631: Partial Gastrectomy with Gastroduodenostomy

CPT-43632-PARTIAL-GASTRECTOMY-WITH-GASTROJEJUNOSTOMY

CPT 43632: Partial Gastrectomy with Gastrojejunostomy Reconstruction

CPT-43633-PARTIAL-GASTRECTOMY-STOMACH-RESECTION-RECONSTRUCTION

CPT 43633: Partial Gastrectomy with Small Bowel Anastomosis

CPT-43634-PARTIAL-GASTRECTOMY-WITH-INTESTINAL-POUCH-RECONSTRUCTION

CPT 43634: Partial Gastrectomy With Intestinal Pouch Reconstruction

CPT-43635-GASTRIC-RESECTION-WITH-VAGOTOMY

CPT 43635: Gastric Resection with Vagotomy

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work or complexity substantially exceeds typical for the procedure due to factors such as extensive adhesions or difficult dissection.
`23`	Unusual anesthesia	Use when procedure is performed under general anesthesia but circumstances create medically necessary conditions for increased risk (e.g., patient intolerance to standard sedation).
`26`	Professional component	Use when reporting only the surgeon's professional component separate from facility technical component (rare for operative procedures).
`50`	Bilateral procedure	Use if the procedure is performed on bilateral gastric sites (rare; modifier included for applicability).
`51`	Multiple procedures	Use when additional distinct procedures are performed during the same operative session and payer requires multiple-procedure reporting.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally intended.
`53`	Discontinued procedure	Use when procedure is started but terminated due to extenuating circumstances prior to completion.
`62`	Two surgeons	Use when two surgeons of different specialties work together as primary surgeons perform distinct portions of the operation.
`78`	Unplanned return to OR	Use for an unplanned return to the operating room within the global period for a related procedure.
`79`	(Not listed in provided modifiers)	Data not available in the input.

Taxonomy Code	Specialty	Notes
`408600000X`	General Surgery	Most common specialty performing open gastric biopsies and excisions.
`207L00000X`	Colorectal Surgery	May perform abdominal access and gastric procedures in complex cases.
`208000000X`	Gastroenterology	Involved in diagnosis and preoperative endoscopic assessment; endoscopic biopsies precede surgical biopsy.
`2086S0105X`	Surgical Oncology	Performs oncologic resections and diagnostic excisional biopsies when malignancy suspected.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C16.9`	Malignant neoplasm of stomach, unspecified	Primary concern when a suspicious gastric lesion is found; open biopsy may be required for diagnosis and staging.
`D37.4`	Neoplasm of uncertain or unknown behavior of stomach	Lesions of uncertain behavior often require excisional or open biopsy to determine malignancy.
`K31.0`	Chronic atrophic gastritis	Chronic gastric disease can be associated with mucosal lesions and may prompt biopsy when suspicious areas are identified.
`K29.70`	Gastritis, unspecified, without bleeding	Gastritis with atypical appearing lesions may require biopsy to exclude neoplasm.
`R19.7`	Diarrhea, unspecified	Nonspecific GI symptoms that may accompany gastric pathology prompting diagnostic evaluation, including biopsy.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`43239`	Esophagogastroduodenoscopy, flexible, transoral; with biopsy, single or multiple	Often performed before open biopsy for endoscopic assessment and tissue sampling; may precede open excisional biopsy when endoscopic sampling is inadequate.
`49080`	Exploratory laparotomy, exploratory celiotomy with biopsy(s) of intra-abdominal organs (separate procedure)	Related intra-abdominal exploratory approaches can be used when broader abdominal exploration is required in conjunction with gastric biopsy.
`88305`	Pathology examination, surgical pathology, intermediate complexity (e.g., gross and microscopic examination)	Typical pathology CPT code for histologic examination of gastric biopsy specimens sent by the surgeon.
`99223`	Initial hospital care, typically 70 minutes or more	Preoperative or immediate postoperative inpatient evaluation and management associated with major surgery.
`47562`	Laparoscopy, surgical, gastric procedures (example), when performed	Minimally invasive gastric procedures may be performed instead of open biopsy when feasible; included for workflow context.

CPT 43610: Surgical Exploration of Stomach with Lesion Excision

CPT-43611-GASTRIC-TUMOR-EXCISION-SURGICAL-ONCOLOGY

CPT 43611: Excision of Cancerous Stomach Tumor

CPT-43620-ESOPHAGOENTEROSTOMY-AFTER-GASTRECTOMY

CPT 43620: Esophagoenterostomy After Gastrectomy

CPT-43621-TOTAL-GASTRECTOMY-SMALL-BOWEL-ANASTOMOSIS

CPT 43621: Total Gastrectomy with Small-Bowel Anastomosis

CPT-43622-TOTAL-GASTRECTOMY-ESOPHAGODUODENAL-POUCH-RECONSTRUCTION

CPT 43622: Total Gastrectomy with Esophagoduodenal Pouch Reconstruction

CPT-43631-PARTIAL-GASTRECTOMY-GASTRODUODENOSTOMY

CPT 43631: Partial Gastrectomy with Gastroduodenostomy

CPT-43632-PARTIAL-GASTRECTOMY-WITH-GASTROJEJUNOSTOMY

CPT 43632: Partial Gastrectomy with Gastrojejunostomy Reconstruction

CPT-43633-PARTIAL-GASTRECTOMY-STOMACH-RESECTION-RECONSTRUCTION

CPT 43633: Partial Gastrectomy with Small Bowel Anastomosis

CPT-43634-PARTIAL-GASTRECTOMY-WITH-INTESTINAL-POUCH-RECONSTRUCTION

CPT 43634: Partial Gastrectomy With Intestinal Pouch Reconstruction

CPT-43635-GASTRIC-RESECTION-WITH-VAGOTOMY

CPT 43635: Gastric Resection with Vagotomy

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 43605: Open Biopsy and Excision of Gastric Lesion

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Billing Code Overview

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CPT 43605: Open Biopsy and Excision of Gastric Lesion

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References