Summary & Overview
CPT 44820: Excision of Peritoneal or Mesenteric Lesion
CPT code 44820 represents the surgical excision of a lesion on the peritoneum or mesentery for pathologic evaluation or to prevent intestinal obstruction. This operative procedure is clinically significant because peritoneal and mesenteric lesions can indicate malignancy, infection, or cause mechanical complications such as bowel obstruction. Accurate coding of 44820 supports appropriate clinical documentation and claims processing for abdominal surgical care.
Key payers considered in this national overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The analysis addresses payer coverage patterns, common billing practices, and the clinical context for use of this operative code.
Readers will find a concise explanation of the code’s clinical intent, guidance on typical sites of service, and an outline of what documentation is relevant to support the procedure. The publication summarizes benchmark considerations and recent policy themes affecting operative abdominal procedures, highlights documentation elements that commonly affect medical necessity reviews, and provides clinical context for when 44820 is appropriate. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 44820 describes the surgical removal of a lesion on the peritoneum or mesentery, the lining of the abdominal cavity that supports the intestines. The procedure is performed to obtain tissue for pathologic examination and/or to prevent intestinal obstruction caused by the lesion.
Service Type: Surgical excision / operative procedure on the peritoneum or mesentery
Typical Site of Service: Hospital operating room or ambulatory surgical center, as the procedure requires operative access to the abdominal cavity.
Clinical & Coding Specifications
Clinical Context
A 56-year-old patient presents with intermittent abdominal pain, early satiety, and imaging (CT abdomen/pelvis) showing a solitary peritoneal/mesenteric nodule suspicious for a metastatic deposit or adhesive fibrotic band causing partial small-bowel obstruction. The surgical team elects for operative exploration. Under general anesthesia in an operating room, the surgeon performs an open or laparoscopic abdominal exploration, identifies the peritoneal or mesenteric lesion, and excises it for pathologic examination and to relieve or prevent bowel obstruction. Intraoperative steps include inspection of the peritoneal cavity, mobilization of the involved bowel/mesentery, careful dissection of the lesion from surrounding tissues, hemostasis, and specimen submission to surgical pathology. Typical post‑operative workflow includes routine recovery, pathology review with final diagnosis, and documentation of operative findings, lesion size and location, and reason for excision (diagnostic vs. therapeutic). The typical site of service is the hospital operating room; ambulatory surgical center use is possible for select benign lesions when clinically appropriate. Common clinical indications include suspected metastatic peritoneal implants, peritoneal carcinomatosis evaluation, solitary mesenteric masses, or symptomatic adhesions/strictures at risk for obstruction.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
59 | Distinct procedural service | When another procedure performed during the same session is separate and not integral to the excision (use to indicate a distinct lesion excision). |