H18.6 ICD-10-CA code: Keratoconus
H18.6 is the ICD-10-CA code for “Keratoconus” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
H18.6Keratoconus
ICD-10-CA · Canada · Also written H186
Index terms
Entries in CIHI’s alphabetical index that lead to H18.6. Searching the index by the condition the note names is how coders reach this code.
- Conical, cornea
- Conus (congenital) (any type), acquired, cornea
Notes for H18.6
As CIHI prints them, with any note H18.6 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 H18.6 sits
- 1ChapterChapter 7: Diseases of the eye and adnexa (H00-H59)
- 2Block H15-H22Disorders of sclera, cornea, iris and ciliary body
- 3Category H18Other disorders of cornea
- 4Valid code H18.6Keratoconus
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
What does ICD-10-CA code H18.6 mean?
H18.6 is the ICD-10-CA code for “Keratoconus” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is H18.6 in ICD-10-CA?
H18.6 sits under H18 Other disorders of cornea, within H15-H22 Disorders of sclera, cornea, iris and ciliary body, within Chapter 7: Diseases of the eye and adnexa (H00-H59).
What coding notes apply to H18.6?
ICD-10-CA lists Excludes notes for H18.6, 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.