2027 ICD-10-CM Diagnosis Code H40Glaucoma

ICD-10-CM Codes›H00–H59›H40-H42›H40

ICD-10-CM H40
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H40: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical InformationClinical

  • 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)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H40Overview

What is the ICD-10 code for glaucoma?

H40 is the ICD-10-CM category for glaucoma, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can H40 be reported with a code from H44.51?

Not as a rule. The Excludes1 note on H40 lists "absolute glaucoma (H44.51-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).