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CPT 49010: Retroperitoneal Exploration with Biopsy

CPT code 49010 denotes diagnostic surgical exploration of the retroperitoneal space with biopsy of suspicious tissue. The procedure is used to investigate causes of abdominal pain, evaluate masses, assess suspected traumatic injury, and identify infections when noninvasive methods are inconclusive. Nationally, this code represents a specialized operative diagnostic service that intersects surgical, pathology, and inpatient care workflows and has implications for hospital resource use, operating room scheduling, and pathology processing.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical intent and typical settings for the service, the common modifiers that accompany this procedure, and the payer mix considered in benchmarks. The publication also summarizes clinical context for why the procedure is performed, common documentation elements that support medical necessity, and expected sites of service. Data not provided in the input is explicitly noted where relevant.

This summary is intended for clinicians, billing professionals, and policy analysts who need a clear, national-level view of what CPT code 49010 represents, how it is used in practice, and which major payers are relevant to coverage and claims processing discussions.

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Billing Code Overview

CPT code 49010 describes an intra-abdominal procedure in which a provider examines the organs located behind and outside the back wall of the peritoneum (the retroperitoneal space) to determine the cause of abdominal pain, masses, suspected traumatic injury, or infection. During the procedure, the clinician obtains a tissue sample from any suspicious area and submits it to a laboratory for analysis.

Service type: Diagnostic surgical exploration with biopsy of retroperitoneal organs
Typical site of service: Hospital operating room or surgical suite; may also occur in an ambulatory surgery center when clinically appropriate

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CPT 49010: Retroperitoneal Exploration with Biopsy

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Get alerted when payer policies referencing 49010 are released or updated.

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Billing Code Overview

Service type: Diagnostic surgical exploration with biopsy of retroperitoneal organs
Typical site of service: Hospital operating room or surgical suite; may also occur in an ambulatory surgery center when clinically appropriate

Clinical & Coding Specifications

Clinical Context

A 48-year-old male presents to the emergency department with persistent, severe left flank pain after a motor vehicle collision and increasing abdominal tenderness and low-grade fever. Focused examination and CT imaging raise concern for retroperitoneal hematoma versus traumatic injury to the left kidney and surrounding tissues. The general surgery team schedules a diagnostic and therapeutic retroperitoneal exploration with tissue biopsy to evaluate bleeding source, rule out organ rupture, and obtain samples for histopathology and culture.

The patient is consented, brought to the operating room, and given general anesthesia. The surgeon makes an incision over the affected retroperitoneal quadrant, bluntly dissects into the retroperitoneal space, inspects the kidneys, adrenal gland, ureter, and regional lymph nodes, identifies a suspicious mass and a contained hematoma, and obtains targeted tissue biopsies and fluid for culture. Hemostasis is secured and drains placed as indicated. Specimens are labeled and sent to the pathology and microbiology laboratories. Postoperatively, the patient is monitored in the PACU with follow-up imaging and pathology review to guide ongoing management.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier (unmodified)	Used when no modifier applies and billing under standard circumstances.
`11`	Office/Outpatient Visit (or default modifier)	Applied by facilities or payors that require reporting of the default service indicator; not commonly appended by surgeons.
`22`	Increased Procedural Services	Use when work or complexity substantially greater than typical for the procedure (document increased work).
`52`	Reduced Services	Use when the procedure is partially reduced or not completed as planned (document reason).
`53`	Discontinued Procedure	Use when the procedure is started but terminated due to extenuating circumstances prior to completion.
`59`	Distinct Procedural Service	Use to indicate a separate, distinct procedural service from other reported services on the same day (support with operative note).
`62`	Two Surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of the procedure.
`66`	Surgical Team	Use when a surgical team approach is used and credentialing supports team billing.
`78`	Unplanned Return to OR Following Initial Procedure	Use when patient returns to the operating room for a related procedure during the postoperative period.
`79`	Unrelated Procedure or Service by the Same Physician During the Postoperative Period	Use when an unrelated procedure is performed during the global period.
`80`	Assistant Surgeon	Use when an assistant surgeon actively assists during the procedure (facility and payer rules apply).
`81`	Minimum Assistant Surgeon	Use when a minimum assistant surgeon provides limited assistance.
`26`	Professional Component	Use when reporting only the physician component of a service if separate technical and professional components exist (rare for surgical procedures).
`TC`	Technical Component	Use when reporting only the technical component of a service (facility billing contexts).

Taxonomy Code	Specialty	Notes
`207K00000X`	General Surgery	Most common specialty performing retroperitoneal exploration and biopsy.
`207L00000X`	Vascular Surgery	Involved when vascular injury or retroperitoneal bleeding from major vessels is suspected.
`207MG0200X`	Urology	Performs retroperitoneal exploration when kidneys, ureters, or adrenal glands are primary organs of concern.
`2080S00000X`	Surgical Oncology	Involved when retroperitoneal masses or suspected malignancy require oncologic resection/biopsy.
`207RN0400X`	Trauma Surgery	Often performs this procedure in the acute trauma setting for diagnosis and control of hemorrhage.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S37.03`	Injury of kidney	Retroperitoneal exploration used to evaluate and manage suspected renal injury after trauma.
`S35.60`	Injury of retroperitoneal organs, unspecified	Applied for traumatic injury to retroperitoneal structures prompting diagnostic exploration.
`N28.9`	Disorder of kidney and ureter, unspecified	Used when kidney-related pathology is suspected but not yet specified—biopsy may clarify diagnosis.
`K68.2`	Retroperitoneal abscess	Direct indication for drainage and exploration with culture and tissue sampling.
`R10.9`	Unspecified abdominal pain	Common presenting symptom that may lead to retroperitoneal exploration when imaging is inconclusive.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`49002`	Drainage of retroperitoneal abscess; percutaneous or open	May be performed before or after exploration when abscess is identified and requires drainage.
`49020`	Drainage of perirenal abscess; open or percutaneous	Used when infection localized to perirenal space is present and drainage is required.
`49320`	Diagnostic laparoscopy, peritoneal cavity, exploratory; with biopsy(s)	Minimally invasive alternative for intra-abdominal evaluation when the peritoneal cavity is accessed rather than the retroperitoneum.
`44120`	Enterolysis (separation of intestinal adhesions), single or multiple	May be performed concurrently if adhesions are encountered during exploration that require release.
`76942`	Ultrasonic guidance for needle placement (e.g., biopsy)	Used when intraoperative or percutaneous image guidance is used to obtain biopsies or localize lesions.

CPT 49000: Intra-Abdominal Exploration with Biopsy

CPT-49002-EXPLORATORY-REOPENING-OF-ABDOMINAL-INCISION

CPT 49002: Reopening of Abdominal Incision for Exploration

CPT-49013-PELVIC-PREPERITONEAL-PACKING-FOR-HEMORRHAGE-CONTROL

CPT 49013: Preperitoneal Pelvic Packing for Hemorrhage Control

CPT-49014-PELVIC-CAVITY-REOPENING-AND-REMOVAL-OF-PACKING

CPT 49014: Reopening Pelvic Cavity and Removal of Preperitoneal Packing

CPT-49020-OPEN-INCISION-DRAINAGE-INTRA-ABDOMINAL-ABSCESS

CPT 49020: Open Incision and Drainage of Intra‑abdominal Abscess

CPT-49040-SUBDIAPHRAGMATIC-ABSCESS-INCISION-AND-DRAINAGE

CPT 49040: Incision and Drainage of Subdiaphragmatic Abscess

CPT-49060-RETROPERITONEAL-ABSCESS-DRAINAGE-OPEN

CPT 49060: Incision and Drainage of Retroperitoneal Abscess

CPT-49062-EXTRAPERITONEAL-LYMPHATIC-FLUID-DRAINAGE

CPT 49062: Extraperitoneal Lymphatic Fluid Drainage

CPT-49082-ABDOMINAL-PARACENTESIS-WITHOUT-IMAGING

CPT 49082: Abdominal Paracentesis Without Imaging

CPT-49083-IMAGE-GUIDED-ABDOMINAL-PARACENTESIS

CPT 49083: Image-Guided Abdominal Paracentesis

Showing 1–10 of 11

Frequently Asked Questions

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
`00`	No modifier (unmodified)	Used when no modifier applies and billing under standard circumstances.
`11`	Office/Outpatient Visit (or default modifier)	Applied by facilities or payors that require reporting of the default service indicator; not commonly appended by surgeons.
`22`	Increased Procedural Services	Use when work or complexity substantially greater than typical for the procedure (document increased work).
`52`	Reduced Services	Use when the procedure is partially reduced or not completed as planned (document reason).
`53`	Discontinued Procedure	Use when the procedure is started but terminated due to extenuating circumstances prior to completion.
`59`	Distinct Procedural Service	Use to indicate a separate, distinct procedural service from other reported services on the same day (support with operative note).
`62`	Two Surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of the procedure.
`66`	Surgical Team	Use when a surgical team approach is used and credentialing supports team billing.
`78`	Unplanned Return to OR Following Initial Procedure	Use when patient returns to the operating room for a related procedure during the postoperative period.
`79`	Unrelated Procedure or Service by the Same Physician During the Postoperative Period	Use when an unrelated procedure is performed during the global period.
`80`	Assistant Surgeon	Use when an assistant surgeon actively assists during the procedure (facility and payer rules apply).
`81`	Minimum Assistant Surgeon	Use when a minimum assistant surgeon provides limited assistance.
`26`	Professional Component	Use when reporting only the physician component of a service if separate technical and professional components exist (rare for surgical procedures).
`TC`	Technical Component	Use when reporting only the technical component of a service (facility billing contexts).

Taxonomy Code	Specialty	Notes
`207K00000X`	General Surgery	Most common specialty performing retroperitoneal exploration and biopsy.
`207L00000X`	Vascular Surgery	Involved when vascular injury or retroperitoneal bleeding from major vessels is suspected.
`207MG0200X`	Urology	Performs retroperitoneal exploration when kidneys, ureters, or adrenal glands are primary organs of concern.
`2080S00000X`	Surgical Oncology	Involved when retroperitoneal masses or suspected malignancy require oncologic resection/biopsy.
`207RN0400X`	Trauma Surgery	Often performs this procedure in the acute trauma setting for diagnosis and control of hemorrhage.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S37.03`	Injury of kidney	Retroperitoneal exploration used to evaluate and manage suspected renal injury after trauma.
`S35.60`	Injury of retroperitoneal organs, unspecified	Applied for traumatic injury to retroperitoneal structures prompting diagnostic exploration.
`N28.9`	Disorder of kidney and ureter, unspecified	Used when kidney-related pathology is suspected but not yet specified—biopsy may clarify diagnosis.
`K68.2`	Retroperitoneal abscess	Direct indication for drainage and exploration with culture and tissue sampling.
`R10.9`	Unspecified abdominal pain	Common presenting symptom that may lead to retroperitoneal exploration when imaging is inconclusive.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`49002`	Drainage of retroperitoneal abscess; percutaneous or open	May be performed before or after exploration when abscess is identified and requires drainage.
`49020`	Drainage of perirenal abscess; open or percutaneous	Used when infection localized to perirenal space is present and drainage is required.
`49320`	Diagnostic laparoscopy, peritoneal cavity, exploratory; with biopsy(s)	Minimally invasive alternative for intra-abdominal evaluation when the peritoneal cavity is accessed rather than the retroperitoneum.
`44120`	Enterolysis (separation of intestinal adhesions), single or multiple	May be performed concurrently if adhesions are encountered during exploration that require release.
`76942`	Ultrasonic guidance for needle placement (e.g., biopsy)	Used when intraoperative or percutaneous image guidance is used to obtain biopsies or localize lesions.

CPT 49000: Intra-Abdominal Exploration with Biopsy

CPT-49002-EXPLORATORY-REOPENING-OF-ABDOMINAL-INCISION

CPT 49002: Reopening of Abdominal Incision for Exploration

CPT-49013-PELVIC-PREPERITONEAL-PACKING-FOR-HEMORRHAGE-CONTROL

CPT 49013: Preperitoneal Pelvic Packing for Hemorrhage Control

CPT-49014-PELVIC-CAVITY-REOPENING-AND-REMOVAL-OF-PACKING

CPT 49014: Reopening Pelvic Cavity and Removal of Preperitoneal Packing

CPT-49020-OPEN-INCISION-DRAINAGE-INTRA-ABDOMINAL-ABSCESS

CPT 49020: Open Incision and Drainage of Intra‑abdominal Abscess

CPT-49040-SUBDIAPHRAGMATIC-ABSCESS-INCISION-AND-DRAINAGE

CPT 49040: Incision and Drainage of Subdiaphragmatic Abscess

CPT-49060-RETROPERITONEAL-ABSCESS-DRAINAGE-OPEN

CPT 49060: Incision and Drainage of Retroperitoneal Abscess

CPT-49062-EXTRAPERITONEAL-LYMPHATIC-FLUID-DRAINAGE

CPT 49062: Extraperitoneal Lymphatic Fluid Drainage

CPT-49082-ABDOMINAL-PARACENTESIS-WITHOUT-IMAGING

CPT 49082: Abdominal Paracentesis Without Imaging

CPT-49083-IMAGE-GUIDED-ABDOMINAL-PARACENTESIS

CPT 49083: Image-Guided Abdominal Paracentesis

Showing 1–10 of 11

Frequently Asked Questions

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.

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CPT 49010: Retroperitoneal Exploration with Biopsy

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Billing Code Overview

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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

CPT 49010: Retroperitoneal Exploration with Biopsy

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Billing Code Overview

CPT 49010: Retroperitoneal Exploration with Biopsy

Sign up for cpt 49010 policy alerts

Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 49010 cover and where is the procedure typically performed?

Which specialties commonly perform retroperitoneal exploration with biopsy?

Which CPT modifiers are relevant to billing CPT 49010?

What related CPT codes might be reported alongside or instead of 49010?

What diagnoses support medical necessity for CPT 49010 according to the page?

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

What does CPT 49010 cover and where is the procedure typically performed?

Which specialties commonly perform retroperitoneal exploration with biopsy?

Which CPT modifiers are relevant to billing CPT 49010?

What related CPT codes might be reported alongside or instead of 49010?

What diagnoses support medical necessity for CPT 49010 according to the page?

References