NPI Atlas

H42 – Glaucoma in diseases classified elsewhere

ICD-10-CM 2027 diagnosis code · Glaucoma

Billable code

ICD-10-CM code H42

Code: H42 (claims format: H42)
Description: Glaucoma in diseases classified elsewhere
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 7. Diseases of the eye and adnexa (H00-H59)
Block: H40-H42 Glaucoma

Notes for H42

Excludes1 (not coded here):

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)

Index terms for H42

Entries in the ICD-10-CM alphabetic index that lead to this code:

Frequently asked questions

What is ICD-10 code H42?

H42 is the ICD-10-CM code for glaucoma in diseases classified elsewhere, in the block H40-H42 (Glaucoma).

Is H42 a billable code?

Yes. H42 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.