2026 ICD-10-CM Diagnosis Code H40.52X0Glaucoma secondary to other eye disorders, left eye, stage unspecified

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.52X0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.52X0 is a billable ICD-10-CM diagnosis code for glaucoma secondary to other eye disorders, left eye, 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
H40.52X0
Billable Status
Yes — Valid for Submission
Code Describes
Glaucoma secondary to other eye disorders, left eye, stage unspecified
Short Description
Glaucoma secondary to oth eye disord, left eye, stage unsp
Parent Code
H40.52
Glaucoma secondary to other eye disorders, left eye

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.52X0Glaucoma secondary to other eye disorders, left eye, stage unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Angle closure glaucoma due to intraocular neoplasm
  • Angle closure glaucoma of left eye due to intraocular neoplasm
  • Angle closure glaucoma of left eye due to peripheral anterior synechiae
  • Angle closure of left eye due to congenital malformation of angle of anterior chamber of left eye
  • Angle closure of left eye due to intraocular neoplasm
  • Angle closure of left eye due to iridocorneal endothelial syndrome
  • Aphakic glaucoma
  • Aphakic glaucoma of left eye
  • Ghost cell glaucoma
  • Ghost cell glaucoma of left eye
  • Glaucoma due to congenital chamber angle anomaly
  • Glaucoma due to cyst of ciliary body
  • Glaucoma due to cyst of ciliary body of left eye
  • Glaucoma due to cyst of iris
  • Glaucoma due to cyst of iris of left eye
  • Glaucoma due to cyst of left eye proper
  • Glaucoma due to intraocular neoplasm
  • Glaucoma due to iris anomaly
  • Glaucoma due to retinal detachment
  • Glaucoma of left eye due to anterior segment anomaly
  • Glaucoma of left eye due to congenital anomaly of iris
  • Glaucoma of left eye due to congenital chamber angle anomaly
  • Glaucoma of left eye due to intraocular neoplasm
  • Glaucoma of left eye due to lens disorder
  • Glaucoma of left eye due to retinal detachment
  • Hemolytic glaucoma
  • Hemolytic glaucoma of left eye
  • Left secondary angle-closure glaucoma due to pupil block
  • Lens particle glaucoma
  • Lens particle glaucoma of left eye
  • Neovascular angle closure glaucoma
  • Neovascular angle closure glaucoma of left eye
  • Neovascularization of angle of left eye
  • Open angle glaucoma due to ocular vascular disorder
  • Open angle glaucoma due to vascular disorder
  • Open angle glaucoma of left eye due to neovascularization
  • Open angle glaucoma of left eye due to ocular vascular disorder
  • Open angle glaucoma of left eye due to vascular disorder
  • Phacolytic glaucoma
  • Phacolytic glaucoma of left eye
  • Phacomorphic glaucoma
  • Phacomorphic glaucoma of left eye
  • Secondary angle-closure due to iridocorneal endothelial syndrome
  • Secondary angle-closure glaucoma - synechial
  • Secondary angle-closure glaucoma due to iridocorneal endothelial syndrome
  • Secondary angle-closure glaucoma of left eye due to iridocorneal endothelial syndrome
  • Secondary angle-closure glaucoma with pupillary block
  • Secondary open angle glaucoma due to neovascularization
  • Secondary open angle glaucoma due to ocular surgery
  • Secondary open angle glaucoma of left eye due to ocular surgery
  • Secondary open-angle glaucoma of left eye

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 H40.52X0 to ICD-9-CMHistory

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

ICD-9-CM
365.59 Glaucoma w lens dis NEC
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
365.60 Glauc w ocular dis 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
365.61 Glauc w pupillary block
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
365.64 Glaucoma w tumor or cyst
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 H40.52X0Overview

Is H40.52X0 (Glaucoma secondary to other eye disorders, left eye) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report glaucoma secondary to other eye disorders, left eye, stage unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character 0 in H40.52X0 mean?

The final character 0 reports glaucoma with the stage unspecified, in this case involving the glaucoma secondary to other eye disorders.

What MS-DRG does H40.52X0 group to?

When glaucoma secondary to other eye disorders, left eye, 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 H40.52X0?

Under the General Equivalence Mappings, glaucoma secondary to other eye disorders, left eye, stage unspecified converts to ICD-9-CM 365.59 (glaucoma w lens dis NEC), 365.60 (glauc w ocular dis NOS), and 365.61 (glauc w pupillary block). 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.