2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to D31.91: its own notes plus those printed at D31 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From D31 Benign neoplasm of eye and adnexa applies to 24 codes
  • benign neoplasm of connective tissue of eyelid (D21.0)
  • benign neoplasm of optic nerve (D33.3)
  • benign neoplasm of skin of eyelid (D22.1-, D23.1-)

Notes

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About D31.91Overview

What is the ICD-10 code for benign neoplasm of unspecified part of right eye?

The ICD-10-CM code for benign neoplasm of unspecified part of right eye is D31.91 (sometimes written as D3191). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

Can D31.91 be reported with D21.0?

Not as a rule. The Excludes1 note at D31, which applies to D31.91, lists "benign neoplasm of connective tissue of eyelid (D21.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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.