2026 ICD-10-CM Diagnosis Code H40.039Anatomical narrow angle, unspecified eye

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.039
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.039 is a billable ICD-10-CM diagnosis code for anatomical narrow angle, 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 Glaucoma.

Code Identity

ICD-10-CM Code
H40.039
Billable Status
Yes — Valid for Submission
Code Describes
Anatomical narrow angle, unspecified eye
Short Description
Anatomical narrow angle, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H40.03
Anatomical narrow angle

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.039Anatomical narrow angle, unspecified eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute angle closure
  • Acute angle closure due to anterior chamber angle anomaly
  • Acute angle closure due to intraocular neoplasm
  • Anatomical narrow angle glaucoma with borderline intraocular pressure
  • Angle closure due to anterior chamber angle anomaly
  • Angle closure due to intraocular neoplasm
  • Chronic angle-closure glaucoma
  • Drug-induced acute angle closure
  • Drug-induced angle closure
  • Iridotrabecular contact for more than 180 degrees
  • Narrow angle
  • Postoperative acute angle closure
  • Postoperative angle closure
  • Primary angle closure suspect
  • Secondary angle-closure - synechial
  • Secondary angle-closure due to iridocorneal endothelial syndrome

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 H40.039 to ICD-9-CMHistory

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

ICD-9-CM
365.02 Anatomical narrow angle
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 H40.039Overview

Is H40.039 (Anatomical narrow angle) a billable code?

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

What MS-DRG does H40.039 group to?

When anatomical narrow angle, 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 H40.039?

Under the General Equivalence Mappings, anatomical narrow angle, unspecified eye converts to ICD-9-CM 365.02 (anatomical narrow angle). 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.