2026 ICD-10-CM Diagnosis Code D31.91Benign neoplasm of unspecified part of right eye

ICD-10-CM Codes›C00–D49›D10-D36›D31

ICD-10-CM D31.91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D31.91 is a billable ICD-10-CM diagnosis code for benign neoplasm of unspecified part of right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as benign neoplasm of right eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D31.91
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of unspecified part of right eye
Short Description
Benign neoplasm of unspecified part of right eye
Same as the full description in the CMS dataset.
Parent Code
D31.9
Benign neoplasm of unspecified part of eye

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD31Benign neoplasm of eye and adnexa
This CodeD31.91Benign neoplasm of unspecified part of right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Benign neoplasm of right eye
  • Bilateral benign neoplasm of eyes
  • Choristoma of eye proper
  • Choristoma of right eye proper

Clinical ClassificationClinical

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

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

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
eye NECC69.9C79.49D09.2D31.9D48.7D49.89
eyeballC69.9C79.49D09.2D31.9D48.7D49.89
intraocularC69.9C79.49D09.2D31.9D48.7D49.89

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 D31.91 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
224.8 Benign neoplasm eye NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
224.9 Benign neoplasm eye NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About D31.91Overview

Is D31.91 (Benign neoplasm of unspecified part of eye) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report benign neoplasm of unspecified part of right eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D31.91 group to?

When benign neoplasm of unspecified part of right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of D31.91?

Under the General Equivalence Mappings, benign neoplasm of unspecified part of right eye converts to ICD-9-CM 224.8 (benign neoplasm eye NEC) and 224.9 (benign neoplasm eye NOS). 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.