2026 ICD-10-CM Diagnosis Code H31.109Choroidal degeneration, unspecified, unspecified eye

ICD-10-CM Codes›H00–H59›H30-H36›H31

ICD-10-CM H31.109
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H31.109 is a billable ICD-10-CM diagnosis code for choroidal degeneration, unspecified, unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H31.109
Billable Status
Yes — Valid for Submission
Code Describes
Choroidal degeneration, unspecified, unspecified eye
Short Description
Choroidal degeneration, unspecified, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H31.10
Unspecified choroidal degeneration

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH31Other disorders of choroid
This CodeH31.109Choroidal degeneration, unspecified, unspecified eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chorioretinal atrophy
  • Chorioretinal degeneration
  • Choroidal atrophy
  • Choroidal atrophy and alopecia syndrome
  • Choroidal degeneration
  • Choroidal sclerosis
  • Diffuse choroidal sclerosis
  • Helicoid peripapillary chorioretinal degeneration
  • Hereditary choroidal dystrophy
  • Hyaline dystrophy of Bruch's membrane
  • Macular choroidal sclerosis
  • Microcornea
  • Microcornea, myopic chorioretinal atrophy, telecanthus syndrome
  • Peripapillary atrophy
  • Peripheral exudative hemorrhagic chorioretinopathy
  • Pigmented paravenous retinochoroidal atrophy

Clinical ClassificationClinical

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

CCSR EYE005
Retinal and vitreous conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Microcornea

    a congenital abnormality characterized by an abnormally small cornea. the horizontal corneal diameter is less than 10mm or less than 9mm in newborns. it is associated with an increased risk of glaucoma.

Patient EducationClinical

Eye Diseases

Even if your eyes feel healthy, you could have a problem and not know it. That's why regular eye exams are so important. Refractive errors are the most common type of vision problem that makes it hard to see clearly. But some eye conditions or diseases don't have any symptoms and can lead to a permanent loss of vision.

The full article covers:

  • What diseases can affect the eye?
  • What are the symptoms of eye diseases?
  • Who is more likely to develop eye diseases?
  • What are the treatments for eye diseases?
  • Can eye diseases be prevented?

Read the full article at MedlinePlus

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

Convert H31.109 to ICD-9-CMHistory

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

ICD-9-CM
362.77 Bruch membrane dystrophy
Approximate The match is approximate rather than exact.
ICD-9-CM
363.40 Choroidal degen 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 H31.109Overview

Is H31.109 (Unspecified choroidal degeneration) a billable code?

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

What MS-DRG does H31.109 group to?

When choroidal degeneration, unspecified, unspecified 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 H31.109?

Under the General Equivalence Mappings, choroidal degeneration, unspecified, unspecified eye converts to ICD-9-CM 362.77 (bruch membrane dystrophy) and 363.40 (choroidal degen NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.