2026 ICD-10-CM Diagnosis Code H40.1230Low-tension glaucoma, bilateral, stage unspecified

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40.1230
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H40.1230 is a billable ICD-10-CM diagnosis code for low-tension glaucoma, bilateral, 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). The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as bilateral low tension glaucoma of eyes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Glaucoma.

Code Identity

ICD-10-CM Code
H40.1230
Billable Status
Yes — Valid for Submission
Code Describes
Low-tension glaucoma, bilateral, stage unspecified
Short Description
Low-tension glaucoma, bilateral, stage unspecified
Same as the full description in the CMS dataset.
Parent Code
H40.123
Low-tension glaucoma, bilateral

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40.1230Low-tension glaucoma, bilateral, stage unspecified

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H40.1230.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral low tension glaucoma of eyes
  • Low tension glaucoma
  • Low tension glaucoma of left eye
  • Low tension glaucoma of right eye

Clinical ClassificationClinical

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

CCSR EYE003
Glaucoma
Default principal diagnosis: inpatient No · outpatient Yes

Clinical InformationClinical

  • Low Tension Glaucoma

    a form of glaucoma in which chronic optic nerve damage and loss of vision normally attributable to buildup of intraocular pressure occurs despite prevailing conditions of normal intraocular pressure.

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 H40.1230 to ICD-9-CMHistory

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

ICD-9-CM
365.12 Low tension glaucoma
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 H40.1230Overview

Is H40.1230 (Low-tension glaucoma, bilateral) a billable code?

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

What does the 7th character 0 in H40.1230 mean?

The final character 0 reports glaucoma with the stage unspecified, in this case involving the low-tension glaucoma.

Can H40.1230 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because low-tension glaucoma, bilateral, stage unspecified describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of H40.1230?

Under the General Equivalence Mappings, low-tension glaucoma, bilateral, stage unspecified converts to ICD-9-CM 365.12 (low tension glaucoma) 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.