2026 ICD-10-CM Diagnosis Code H31.23Gyrate atrophy, choroid

ICD-10-CM Codes›H00–H59›H30-H36›H31

ICD-10-CM H31.23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H31.23 is a billable ICD-10-CM diagnosis code for gyrate atrophy, choroid. 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 chorioretinal atrophy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H31.23
Billable Status
Yes — Valid for Submission
Code Describes
Gyrate atrophy, choroid
Short Description
Gyrate atrophy, choroid
Same as the full description in the CMS dataset.
Parent Code
H31.2
Hereditary choroidal dystrophy

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH31Other disorders of choroid
This CodeH31.23Gyrate atrophy, choroid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chorioretinal atrophy
  • Clinical manifestation of enzyme deficiency
  • Gyrate atrophy

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.

    • Atrophia
      • gyrata of choroid and retina
    • Atrophy, atrophic(of)
      • choroid (central) (macular) (myopic) (retina)
        • gyrate
    • Dystrophy, dystrophia
      • choroid (hereditary)
        • gyrate 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

  • Gyrate Atrophy

    progressive, autosomal recessive, diffuse atrophy of the choroid, pigment epithelium, and sensory retina that begins in childhood.

  • Gyrate Atrophy

    a rare autosomal recessive inherited disorder caused by mutations in the oat gene. it is characterized by progressive atrophy of the retina and choroid, leading to loss of vision and blindness.

  • OAT wt Allele|GACR|Gyrate Atrophy Gene|HOGA|OATASE|OKT|Ornithine Aminotransferase Precursor Gene|Ornithine Aminotransferase wt Allele

    human oat wild-type allele is located in the vicinity of 10q26.13 and is approximately 22 kb in length. this allele, which encodes ornithine aminotransferase, mitochondrial protein, is involved in the reversible transamination of ornithine to glutamate semialdehyde. mutations in the gene are associated with gyrate atrophy.

Patient EducationClinical

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Read the full article at MedlinePlus

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

Convert H31.23 to ICD-9-CMHistory

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

ICD-9-CM
363.57 Tot gen choroid dyst NEC
Exact Match The mapping is direct, with no qualifiers.

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 H31.23Overview

Is H31.23 (Hereditary choroidal dystrophy) a billable code?

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

What MS-DRG does H31.23 group to?

When gyrate atrophy, choroid 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 H31.23?

Under the General Equivalence Mappings, gyrate atrophy, choroid converts to ICD-9-CM 363.57 (tot gen choroid dyst NEC). The mapping is a direct match.

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.