2026 ICD-10-CM Diagnosis Code D13.91Familial adenomatous polyposis

ICD-10-CM Codes›C00–D49›D10-D36›D13

ICD-10-CM D13.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D13.91 is a billable ICD-10-CM diagnosis code for familial adenomatous polyposis. 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

ICD-10-CM Code
D13.91
Billable Status
Yes — Valid for Submission
Code Describes
Familial adenomatous polyposis
Short Description
Familial adenomatous polyposis
Same as the full description in the CMS dataset.
Parent Code
D13.9
Benign neoplasm of ill-defined sites within the digestive system

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD13Benign neoplasm of other and ill-defined parts of digestive system
This CodeD13.91Familial adenomatous polyposis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code Also

  • associated conditions, such as:
  • benign neoplasm of colon D12.6
  • malignant neoplasm of colon C18

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Polyposis
      • familial
        • adenomatous
    • Polyposis
      • intestinal
        • adenomatous

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO073
Benign neoplasms
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Colonic Polyps

A polyp is an extra piece of tissue that grows inside your body. Colonic polyps grow in the large intestine, or colon. Most polyps are not dangerous. However, some polyps may turn into cancer or already be cancer. To be safe, doctors remove polyps and test them.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement D13.91 replaces the following previously assigned code(s):

  • D13.9 - Benign neoplasm of ill-defined sites within the dgstv sys
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D13.91Overview

Is D13.91 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report familial adenomatous polyposis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D13.91 group to?

When familial adenomatous polyposis 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.

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.