2026 ICD-10-CM Diagnosis Code H40.10X3Unspecified open-angle glaucoma, severe stage

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.10X3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.10X3 is a billable ICD-10-CM diagnosis code for unspecified open-angle glaucoma, severe stage. The 7th character 3 reports severe stage glaucoma. 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 Glaucoma.

Code Identity

ICD-10-CM Code
H40.10X3
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open-angle glaucoma, severe stage
Short Description
Unspecified open-angle glaucoma, severe stage
Same as the full description in the CMS dataset.
Parent Code
H40.10
Unspecified open-angle glaucoma

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.10X3Unspecified open-angle glaucoma, severe stage

Clinical ClassificationClinical

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

CCSR EYE003
Glaucoma
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Open Angle Glaucoma

    chronic outflow obstruction of the eye's drainage canals that can lead to increased internal eye pressure and optic nerve damage.

  • Primary Open Angle Glaucoma

    a form of glaucoma in which there is no visible abnormality in the trabecular meshwork.

Patient EducationClinical

Glaucoma

Glaucoma is a group of diseases that can damage the optic nerve of one, or both, of your eyes. This can result in vision loss. There are different types of glaucoma, but the most common type is open-angle glaucoma. Other less common types include angle-closure glaucoma, and congenital glaucoma.

The full article covers:

  • What is glaucoma?
  • What causes glaucoma?
  • What are the symptoms of glaucoma?
  • How is glaucoma diagnosed?
  • What are the treatments for glaucoma?
  • Can glaucoma be prevented?

Read the full article at MedlinePlus

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

Convert H40.10X3 to ICD-9-CMHistory

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

ICD-9-CM
365.10 Open-angle glaucoma NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
365.10 Open-angle glaucoma NOS
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
365.73 Severe stage glaucoma
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 H40.10X3Overview

Is H40.10X3 (Unspecified open-angle glaucoma) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open-angle glaucoma, severe stage on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character 3 in H40.10X3 mean?

The final character 3 reports severe stage glaucoma, in this case involving the unspecified open-angle glaucoma.

What MS-DRG does H40.10X3 group to?

When unspecified open-angle glaucoma, severe stage 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 H40.10X3?

Under the General Equivalence Mappings, unspecified open-angle glaucoma, severe stage converts to ICD-9-CM 365.10 (open-angle glaucoma NOS), 365.10 (open-angle glaucoma NOS), and 365.73 (severe stage glaucoma). 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.