2026 ICD-10-CM Diagnosis Code D31.40Benign neoplasm of unspecified ciliary body

ICD-10-CM Codes›C00–D49›D10-D36›D31

ICD-10-CM D31.40
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D31.40 is a billable ICD-10-CM diagnosis code for benign neoplasm of unspecified ciliary body. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Benign neoplasms.

Code Identity

ICD-10-CM Code
D31.40
Billable Status
Yes — Valid for Submission
Code Describes
Benign neoplasm of unspecified ciliary body
Short Description
Benign neoplasm of unspecified ciliary body
Same as the full description in the CMS dataset.
Parent Code
D31.4
Benign neoplasm of ciliary body

Code Classification

ChapterC00–D49Neoplasms
SectionD10-D36Benign neoplasms, except benign neuroendocrine tumors
CategoryD31Benign neoplasm of eye and adnexa
This CodeD31.40Benign neoplasm of unspecified ciliary body

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adenoma of neuroepithelium of iris
  • Adenoma of non-pigmented epithelium of ciliary body
  • Adenoma of pigmented epithelium of ciliary body
  • Benign intraocular medulloepithelioma
  • Benign medulloepithelioma of ciliary body
  • Benign neoplasm of ciliary body
  • Benign neoplasm of iris
  • Benign neoplasm of sclera
  • Benign neoplasm of uveal tract
  • Fuchs' adenoma
  • Intraocular leiomyoma
  • Leiomyoma of ciliary body
  • Leiomyoma of iris
  • Melanocytic nevus of ciliary body
  • Neoplasm of iris
  • Neoplasm of sclera
  • Nevus of iris

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.

    • Nevus
      • magnocellular
        • unspecified site

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Ciliary Body

    a ring of tissue extending from the scleral spur to the ora serrata of the retina. it consists of the uveal portion and the epithelial portion. the ciliary muscle is in the uveal portion and the ciliary processes are in the epithelial portion.

  • Spasm

    an involuntary contraction of a muscle or group of muscles. spasms may involve skeletal muscle or smooth muscle.

  • Uveal Melanoma

    a rare, malignant melanoma arising from the melanocytes of the uvea.

  • Schlemm's Canal

    a circular vascular-like structure in the anterior chamber of the eye bounded anterolaterally by the internal scleral sulcus and posteriorly by the trabecular meshwork. it is a part of a pathway where the aqueous humor from the anterior chamber of the eye passes through the trabecular meshwork, drains into the lumen of schlemm’s canal, and subsequently returns to blood circulation into the veins of the sclera.

  • Sclera

    the white, opaque, fibrous, outer tunic of the eyeball, covering it entirely excepting the segment covered anteriorly by the cornea. it is essentially avascular but contains apertures for vessels, lymphatics, and nerves. it receives the tendons of insertion of the extraocular muscles and at the corneoscleral junction contains the canal of schlemm. (from cline et al., dictionary of visual science, 4th ed)

  • Scleral Buckling

    an operation for retinal detachment which reduces the size of the globe by indenting the sclera so that it approximates the retina.

  • Scleral Diseases

    general disorders of the sclera or white of the eye. they may include anatomic, embryologic, degenerative, or pigmentation defects.

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
ciliary bodyC69.4C79.49D09.2D31.4D48.7D49.89
crystalline lensC69.4C79.49D09.2D31.4D48.7D49.89
irisC69.4C79.49D09.2D31.4D48.7D49.89
lens, crystallineC69.4C79.49D09.2D31.4D48.7D49.89
scleraC69.4C79.49D09.2D31.4D48.7D49.89
uveal tractC69.4C79.49D09.2D31.4D48.7D49.89

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 D31.40 to ICD-9-CMHistory

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

ICD-9-CM
224.0 Benign neoplasm eyeball
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 D31.40Overview

Is D31.40 (Benign neoplasm of ciliary body) a billable code?

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

What MS-DRG does D31.40 group to?

When benign neoplasm of unspecified ciliary body 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 D31.40?

Under the General Equivalence Mappings, benign neoplasm of unspecified ciliary body converts to ICD-9-CM 224.0 (benign neoplasm eyeball). 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.