2026 ICD-10-CM Diagnosis Code H40Glaucoma

ICD-10-CM Codes›H00–H59›H40-H42›H40

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

H40 is a non-billable ICD-10-CM category code for glaucoma, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H40.001, H40.002, H40.003, and H40.009.

Code Identity

ICD-10-CM Code
H40
Billable Status
No — Non-Billable Category
Code Describes
Glaucoma
Short Description
Glaucoma
Same as the full description in the CMS dataset.
Chapter
H40-H42
Glaucoma

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH40-H42Glaucoma
CategoryH40Glaucoma
This CodeH40Glaucoma

Specific Coding for GlaucomaOverview

Non-specific codes like H40 require more characters. Use one of these billable codes instead:

  • H40.0 for Glaucoma suspect

  • H40.00 for Preglaucoma, unspecified

  • H40.01 for Open angle with borderline findings, low risk

  • H40.02 for Open angle with borderline findings, high risk

  • H40.03 for Anatomical narrow angle

  • H40.04 for Steroid responder

  • H40.05 for Ocular hypertension

  • H40.06 for Primary angle closure without glaucoma damage

  • H40.1 for Open-angle glaucoma

  • H40.10 for Unspecified open-angle glaucoma

  • H40.11 for Primary open-angle glaucoma

  • H40.12 for Low-tension glaucoma

  • H40.13 for Pigmentary glaucoma

  • H40.14 for Capsular glaucoma with pseudoexfoliation of lens

  • H40.15 for Residual stage of open-angle glaucoma

  • H40.2 for Primary angle-closure glaucoma

  • H40.20 for Unspecified primary angle-closure glaucoma

  • H40.21 for Acute angle-closure glaucoma

  • H40.22 for Chronic angle-closure glaucoma

  • H40.23 for Intermittent angle-closure glaucoma

  • H40.24 for Residual stage of angle-closure glaucoma

  • H40.3 for Glaucoma secondary to eye trauma

  • H40.30 for Glaucoma secondary to eye trauma, unspecified eye

  • H40.31 for Glaucoma secondary to eye trauma, right eye

  • H40.32 for Glaucoma secondary to eye trauma, left eye

  • H40.33 for Glaucoma secondary to eye trauma, bilateral

  • H40.4 for Glaucoma secondary to eye inflammation

  • H40.40 for Glaucoma secondary to eye inflammation, unspecified eye

  • H40.41 for Glaucoma secondary to eye inflammation, right eye

  • H40.42 for Glaucoma secondary to eye inflammation, left eye

  • H40.43 for Glaucoma secondary to eye inflammation, bilateral

  • H40.5 for Glaucoma secondary to other eye disorders

  • H40.50 for Glaucoma secondary to other eye disorders, unspecified eye

  • H40.51 for Glaucoma secondary to other eye disorders, right eye

  • H40.52 for Glaucoma secondary to other eye disorders, left eye

  • H40.53 for Glaucoma secondary to other eye disorders, bilateral

  • H40.6 for Glaucoma secondary to drugs

  • H40.60 for Glaucoma secondary to drugs, unspecified eye

  • H40.61 for Glaucoma secondary to drugs, right eye

  • H40.62 for Glaucoma secondary to drugs, left eye

  • H40.63 for Glaucoma secondary to drugs, bilateral

  • H40.8 for Other glaucoma

  • H40.81 for Glaucoma with increased episcleral venous pressure

  • H40.82 for Hypersecretion glaucoma

  • H40.83 for Aqueous misdirection

  • H40.84 for Neovascular secondary angle closure glaucoma

  • Use H40.89 for Other specified glaucoma

  • Use H40.9 for Unspecified glaucoma

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • absolute glaucoma H44.51
  • congenital glaucoma Q15.0
  • traumatic glaucoma due to birth injury P15.3

Clinical InformationClinical

  • Exfoliation Syndrome

    the deposition of flaky, translucent fibrillar material most conspicuous on the anterior lens capsule and pupillary margin but also in both surfaces of the iris, the zonules, trabecular meshwork, ciliary body, corneal endothelium, and orbital blood vessels. it sometimes forms a membrane on the anterior iris surface. exfoliation refers to the shedding of pigment by the iris. (newell, ophthalmology, 7th ed, p380)

  • Glaucoma

    an ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. the consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (dictionary of visual science, 4th ed)

  • Glaucoma Drainage Implants

    devices, usually incorporating unidirectional valves, which are surgically inserted in the sclera to maintain normal intraocular pressure.

  • Glaucoma, Angle-Closure

    a form of glaucoma in which the intraocular pressure increases because the angle of the anterior chamber is blocked and the aqueous humor cannot drain from the anterior chamber.

  • Glaucoma, Neovascular

    a form of secondary glaucoma which develops as a consequence of another ocular disease and is attributed to the forming of new vessels in the angle of the anterior chamber.

  • Glaucoma, Open-Angle

    glaucoma in which the angle of the anterior chamber is open and the trabecular meshwork does not encroach on the base of the iris.

  • 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.

  • Ocular Hypertension

    a condition in which the intraocular pressure is elevated above normal and which may lead to glaucoma.

  • Weill-Marchesani Syndrome

    rare congenital disorder of connective tissue characterized by brachydactyly, joint stiffness, childhood onset of ocular abnormalities (e.g., microspherophakia, ectopia lentis; glaucoma), and proportionate short stature. cardiovascular anomalies are occasionally seen.

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.

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 H40Overview

Is H40 (Glaucoma) a billable code?

No. This is a category header that groups the codes for glaucoma, and headers cannot be submitted on claims. Claims for glaucoma need a more specific code from this category, such as H40.001, H40.002, and H40.003.