2026 ICD-10-CM Diagnosis Code H40.20X0Unspecified primary angle-closure glaucoma, stage unspecified

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.20X0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.20X0 is a billable ICD-10-CM diagnosis code for unspecified primary angle-closure glaucoma, stage unspecified. The 7th character 0 reports glaucoma with the stage unspecified. 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
H40.20X0
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified primary angle-closure glaucoma, stage unspecified
Short Description
Unsp primary angle-closure glaucoma, stage unspecified
Parent Code
H40.20
Unspecified primary angle-closure glaucoma

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.20X0Unspecified primary angle-closure glaucoma, stage unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anatomic narrow angle glaucoma of left eye
  • Anatomic narrow angle glaucoma of right eye
  • Angle closure glaucoma of left eye
  • Angle closure glaucoma of right eye
  • Angle-closure glaucoma
  • Bilateral angle-closure glaucoma
  • Bilateral eye anatomic narrow angle glaucoma
  • Bilateral narrow angle of anterior chamber of eyes
  • Bilateral primary angle closure
  • Bilateral primary angle closure glaucoma
  • Chronic angle-closure glaucoma
  • Narrow angle of anterior chamber of left eye
  • Narrow angle of anterior chamber of right eye
  • Primary angle closure glaucoma of left eye
  • Primary angle closure glaucoma of right eye
  • Primary angle closure of left eye
  • Primary angle closure of right eye
  • Primary angle-closure glaucoma

Clinical ClassificationClinical

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

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

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 H40.20X0 to ICD-9-CMHistory

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

ICD-9-CM
365.20 Prim angl-clos glauc 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
365.70 Glaucoma stage NOS
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 H40.20X0Overview

Is H40.20X0 (Unspecified primary angle-closure glaucoma) a billable code?

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

What does the 7th character 0 in H40.20X0 mean?

The final character 0 reports glaucoma with the stage unspecified, in this case involving the unspecified primary angle-closure glaucoma.

What MS-DRG does H40.20X0 group to?

When unspecified primary angle-closure glaucoma, stage unspecified 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 H40.20X0?

Under the General Equivalence Mappings, unspecified primary angle-closure glaucoma, stage unspecified converts to ICD-9-CM 365.20 (prim angl-clos glauc NOS) and 365.70 (glaucoma stage 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.