H42
✓ Billable
Glaucoma in diseases classified elsewhere
ICD-10-CM · FY2026 · Diseases of the Eye and Adnexa
Code
H42
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Eye and Adnexa
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes1 — never code together
- glaucoma (in) onchocerciasis (B73.02)
- glaucoma (in) syphilis (A52.71)
- glaucoma (in) tuberculous (A18.59)
- neovascular secondary angle closure glaucoma (H40.84-)
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)
Frequently asked questions
What is ICD-10 code H42?
ICD-10-CM code H42 represents Glaucoma in diseases classified elsewhere. It is a billable diagnosis code in the Diseases of the Eye and Adnexa chapter, effective October 1, 2025 – September 30, 2026.
Is H42 billable?
Yes. H42 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is H42 in?
H42 belongs to the Diseases of the Eye and Adnexa chapter (H00–H59) of ICD-10-CM.
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