H42 ICD-10-CA category: Glaucoma in diseases classified elsewhere
H42 isn’t a code on its own. Choose one of the 2 codes beneath it, the one the documentation supports.
Official description
H42Glaucoma in diseases classified elsewhere
ICD-10-CA · Canada
Codes in H42
H42 isn’t a code on its own. Open the code that matches what the note documents.
Notes for H42
As CIHI prints them, with any note H42 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 7: Diseases of the eye and adnexa (H00-H59)
Where H42 sits
- 1ChapterChapter 7: Diseases of the eye and adnexa (H00-H59)
- 2Block H40-H42Glaucoma
- 3Category H42Glaucoma in diseases classified elsewhere
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is H42 a valid ICD-10-CA code?
No. H42 (Glaucoma in diseases classified elsewhere) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 2 codes; record the one the documentation supports.
Where is H42 in ICD-10-CA?
H42 sits under H40-H42 Glaucoma, within Chapter 7: Diseases of the eye and adnexa (H00-H59).
What coding notes apply to H42?
ICD-10-CA lists Excludes notes for H42, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.