2026 ICD-10-CM Diagnosis Code D12.3Benign neoplasm of transverse colon
ICD-10-CM Codes›C00–D49›D10-D36›D12
- Billable — Valid for Submission
- Not Chronic
D12.3 is a billable ICD-10-CM diagnosis code for benign neoplasm of transverse colon. 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.
- Adenoma of transverse colon
- Benign neoplasm of ascending colon
- Benign neoplasm of descending colon
- Benign neoplasm of hepatic flexure of colon
- Benign neoplasm of splenic flexure of colon
- Benign neoplasm of transverse colon
- Neoplasm of hepatic flexure of colon
- Neoplasm of splenic flexure of colon
- Polyp of ascending colon
- Polyp of hepatic flexure of colon
- Polyp of transverse colon
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Benign neoplasm of hepatic flexure
- Benign neoplasm of splenic flexure
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- adenomatous - D12.6
- transverse - D12.3
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Polyp, polypus
- colon
- adenomatous
- transverse
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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. |
|---|---|---|---|---|---|---|
| hepatic [See Also: Index to disease, by histology] › flexure (colon) | C18.3 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| intestine, intestinal › large › colon › transverse | C18.4 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| intestine, intestinal › large › hepatic flexure | C18.3 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| intestine, intestinal › large › splenic flexure | C18.5 | C78.5 | D01.0 | D12.3 | D37.4 | D49.0 |
| spleen, splenic NEC › flexure (colon) | C18.5 | C78.5 | D01.0 | D12.3 | D37.4 | 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 D12.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D12.3Overview
Is D12.3 (Benign neoplasm of colon, rectum, anus and anal canal) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of transverse colon on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D12.3 group to?
When benign neoplasm of transverse colon 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 D12.3?
Under the General Equivalence Mappings, benign neoplasm of transverse colon converts to ICD-9-CM 211.3 (benign neoplasm lg bowel). 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.
