Version 2024

2024 ICD-10-CM Diagnosis Code H40


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Code Classification

H40 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of glaucoma. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Glaucoma

Non-specific codes like H40 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for glaucoma:

  • H40.0 for Glaucoma suspect - NON-BILLABLE CODE

  • H40.00 for Preglaucoma, unspecified - NON-BILLABLE CODE

  • H40.01 for Open angle with borderline findings, low risk - NON-BILLABLE CODE

  • H40.02 for Open angle with borderline findings, high risk - NON-BILLABLE CODE

  • H40.03 for Anatomical narrow angle - NON-BILLABLE CODE

  • H40.04 for Steroid responder - NON-BILLABLE CODE

  • H40.05 for Ocular hypertension - NON-BILLABLE CODE

  • H40.06 for Primary angle closure without glaucoma damage - NON-BILLABLE CODE

  • H40.1 for Open-angle glaucoma - NON-BILLABLE CODE

  • H40.10 for Unspecified open-angle glaucoma - NON-BILLABLE CODE

  • H40.11 for Primary open-angle glaucoma - NON-BILLABLE CODE

  • H40.12 for Low-tension glaucoma - NON-BILLABLE CODE

  • H40.13 for Pigmentary glaucoma - NON-BILLABLE CODE

  • H40.14 for Capsular glaucoma with pseudoexfoliation of lens - NON-BILLABLE CODE

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

  • H40.2 for Primary angle-closure glaucoma - NON-BILLABLE CODE

  • H40.20 for Unspecified primary angle-closure glaucoma - NON-BILLABLE CODE

  • H40.21 for Acute angle-closure glaucoma - NON-BILLABLE CODE

  • H40.22 for Chronic angle-closure glaucoma - NON-BILLABLE CODE

  • H40.23 for Intermittent angle-closure glaucoma - NON-BILLABLE CODE

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

  • H40.3 for Glaucoma secondary to eye trauma - NON-BILLABLE CODE

  • H40.30 for Glaucoma secondary to eye trauma, unspecified eye - NON-BILLABLE CODE

  • H40.31 for Glaucoma secondary to eye trauma, right eye - NON-BILLABLE CODE

  • H40.32 for Glaucoma secondary to eye trauma, left eye - NON-BILLABLE CODE

  • H40.33 for Glaucoma secondary to eye trauma, bilateral - NON-BILLABLE CODE

  • H40.4 for Glaucoma secondary to eye inflammation - NON-BILLABLE CODE

  • H40.40 for Glaucoma secondary to eye inflammation, unspecified eye - NON-BILLABLE CODE

  • H40.41 for Glaucoma secondary to eye inflammation, right eye - NON-BILLABLE CODE

  • H40.42 for Glaucoma secondary to eye inflammation, left eye - NON-BILLABLE CODE

  • H40.43 for Glaucoma secondary to eye inflammation, bilateral - NON-BILLABLE CODE

  • H40.5 for Glaucoma secondary to other eye disorders - NON-BILLABLE CODE

  • H40.50 for Glaucoma secondary to other eye disorders, unspecified eye - NON-BILLABLE CODE

  • H40.51 for Glaucoma secondary to other eye disorders, right eye - NON-BILLABLE CODE

  • H40.52 for Glaucoma secondary to other eye disorders, left eye - NON-BILLABLE CODE

  • H40.53 for Glaucoma secondary to other eye disorders, bilateral - NON-BILLABLE CODE

  • H40.6 for Glaucoma secondary to drugs - NON-BILLABLE CODE

  • H40.60 for Glaucoma secondary to drugs, unspecified eye - NON-BILLABLE CODE

  • H40.61 for Glaucoma secondary to drugs, right eye - NON-BILLABLE CODE

  • H40.62 for Glaucoma secondary to drugs, left eye - NON-BILLABLE CODE

  • H40.63 for Glaucoma secondary to drugs, bilateral - NON-BILLABLE CODE

  • H40.8 for Other glaucoma - NON-BILLABLE CODE

  • H40.81 for Glaucoma with increased episcleral venous pressure - NON-BILLABLE CODE

  • H40.82 for Hypersecretion glaucoma - NON-BILLABLE CODE

  • H40.83 for Aqueous misdirection - NON-BILLABLE CODE

  • Use H40.89 for Other specified glaucoma - BILLABLE CODE

  • Use H40.9 for Unspecified glaucoma - BILLABLE CODE

Clinical Information

  • 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.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • absolute glaucoma H44.51
  • congenital glaucoma Q15.0
  • traumatic glaucoma due to birth injury P15.3

Patient Education


Glaucoma is a group of diseases that can damage the eye's optic nerve. It is a leading cause of blindness in the United States. It usually happens when the fluid pressure inside the eyes slowly rises, damaging the optic nerve. Often there are no symptoms at first. Without treatment, people with glaucoma will slowly lose their peripheral, or side vision. They seem to be looking through a tunnel. Over time, straight-ahead vision may decrease until no vision remains.

A comprehensive eye exam can tell if you have glaucoma. People at risk should get eye exams at least every two years. They include:

  • African Americans over age 40
  • People over age 60, especially Mexican Americans
  • People with a family history of glaucoma

There is no cure, but glaucoma can usually be controlled. Early treatment can help protect your eyes against vision loss. Treatments usually include prescription eyedrops and/or surgery.

NIH: National Eye Institute

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.