H42 ICD-10-CM Code: Glaucoma in diseases classified elsewhere
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
H42Glaucoma in diseases classified elsewhere
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where H42 sits
- 1
Chapter 7
Diseases of the eye and adnexa (H00-H59)
- 2
Section
Glaucoma (H40-H42)
- 3
Category H42
Glaucoma in diseases classified elsewhere
- 4
Code H42
Glaucoma in diseases classified elsewhere
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for H42.
Code first
- underlying condition, such as:
- amyloidosis (E85.-)
- aniridia (Q13.1)
- glaucoma (in) diabetes mellitus (E08.39, E09.39, E10.39, E11.39, E13.39)
- Lowe's syndrome (E72.03)
- Rieger anomaly (Q13.81)
- specified metabolic disorder (E70-E88)
Use additional code
No “use additional code” instruction is listed for H42.
Excludes1
Conditions that should not be reported together with this code.
- glaucoma (in) onchocerciasis (B73.02)
- glaucoma (in) syphilis (A52.71)
- glaucoma (in) tuberculous (A18.59)
- neovascular secondary angle closure glaucoma (H40.84-)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for H42.
Transparency
Source and release
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 sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code H42 mean?
H42 is the FY 2027 U.S. ICD-10-CM code for “Glaucoma in diseases classified elsewhere.”
Is H42 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, H42 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is H42 located in ICD-10-CM?
H42 is listed in Chapter 7, Diseases of the eye and adnexa (H00-H59), within Glaucoma (H40-H42) (H40–H42), under category H42, Glaucoma in diseases classified elsewhere.
What coding notes are listed for H42?
No inclusion terms are listed for H42 in this reference record. Code-first instructions: underlying condition, such as:; amyloidosis (E85.-); aniridia (Q13.1); glaucoma (in) diabetes mellitus (E08.39, E09.39, E10.39, E11.39, E13.39); Lowe's syndrome (E72.03); Rieger anomaly (Q13.81); specified metabolic disorder (E70-E88). Excludes1 notes: glaucoma (in) onchocerciasis (B73.02); glaucoma (in) syphilis (A52.71); glaucoma (in) tuberculous (A18.59); neovascular secondary angle closure glaucoma (H40.84-). No Excludes2 note is listed.
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