U.S. ICD-10-CM · FY 2027

H40 ICD-10-CM Code: Glaucoma

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

H40

Glaucoma

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where H40 sits

  1. 1

    Chapter 7

    Diseases of the eye and adnexa (H00-H59)

  2. 2

    Section

    Glaucoma (H40-H42)

  3. 3

    Category H40

    Glaucoma

  4. 4

    Code H40

    Glaucoma

More specific choices

Codes under H40

H40 is a non-billable category. Choose the child code that best matches the documented diagnosis.

H40.0

Glaucoma suspect

H40.1

Open-angle glaucoma

H40.2

Primary angle-closure glaucoma

H40.3

Glaucoma secondary to eye trauma

H40.4

Glaucoma secondary to eye inflammation

H40.5

Glaucoma secondary to other eye disorders

H40.6

Glaucoma secondary to drugs

H40.8

Other glaucoma

H40.9

Unspecified glaucoma

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for H40.

Code first

No “code first” instruction is listed for H40.

Use additional code

No “use additional code” instruction is listed for H40.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for H40.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code H40 mean?

H40 is the FY 2027 U.S. ICD-10-CM code for “Glaucoma.”

Is H40 a billable or specific ICD-10-CM code?

No. H40 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is H40 located in ICD-10-CM?

H40 is listed in Chapter 7, Diseases of the eye and adnexa (H00-H59), within Glaucoma (H40-H42) (H40–H42), under category H40, Glaucoma.

What coding notes are listed for H40?

No inclusion terms are listed for H40 in this reference record. No code-first instruction is listed. Excludes1 notes: absolute glaucoma (H44.51-); congenital glaucoma (Q15.0); traumatic glaucoma due to birth injury (P15.3). No Excludes2 note is listed.

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