2026 ICD-10-CM Diagnosis Code D20.1Benign neoplasm of soft tissue of peritoneum
ICD-10-CM Codes›C00–D49›D10-D36›D20
- Billable — Valid for Submission
- Not Chronic
D20.1 is a billable ICD-10-CM diagnosis code for benign neoplasm of soft tissue of peritoneum. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Benign fibrohistiocytic neoplasm of peritoneum
- Benign neoplasm of mesocolon
- Benign neoplasm of mesorectum
- Benign neoplasm of omentum
- Benign neoplasm of parietal peritoneum
- Benign neoplasm of pelvic peritoneum
- Benign neoplasm of peritoneum and retroperitoneum
- Benign neoplasm of rectouterine pouch
- Benign neoplasm of the mesentery
- Benign neoplasm of the peritoneum
- Neoplasm of omentum
- Neoplasm of peritoneum and retroperitoneum
- Neoplasm of rectouterine pouch
- Neoplasm of the mesocolon
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Mesocolon
the fold of peritoneum by which the colon is attached to the posterior abdominal wall.Omentum
a double-layered fold of peritoneum that attaches the stomach to other organs in the abdominal cavity.
Table of NeoplasmsClinical
Anatomical sites in the Table of Neoplasms that reference this code family.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| cavity › peritoneal | C48.2 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| cul-de-sac (Douglas') | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| Douglas' cul-de-sac or pouch | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| mesentery, mesenteric | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| mesoappendix | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| mesocolon | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| omentum | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| peritoneum, peritoneal (cavity) | C48.2 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| peritoneum, peritoneal (cavity) › parietal | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| peritoneum, peritoneal (cavity) › pelvic | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| peritoneum, peritoneal (cavity) › specified part NEC | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
| rectouterine pouch | C48.1 | C78.6 | – | D20.1 | D48.4 | D49.0 |
Patient EducationClinical
Benign Tumors
Tumors are abnormal growths in your body. They can be either benign or malignant. Benign tumors aren't cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D20.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D20.1Overview
Is D20.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of soft tissue of peritoneum on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D20.1 group to?
When benign neoplasm of soft tissue of peritoneum is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of D20.1?
Under the General Equivalence Mappings, benign neoplasm of soft tissue of peritoneum converts to ICD-9-CM 211.8 (ben neo peritoneum). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
