H55 ICD-10-CA code: Nystagmus and other irregular eye movements
H55 is the ICD-10-CA code for “Nystagmus and other irregular eye movements” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
H55Nystagmus and other irregular eye movements
Short description: Nystagmus & other irregular eye movement
ICD-10-CA · Canada
Index terms
Entries in CIHI’s alphabetical index that lead to H55. Searching the index by the condition the note names is how coders reach this code.
- Nystagmus (congenital) (deprivation) (dissociated) (latent)
- Nystagmus (congenital) (deprivation) (dissociated) (latent), miner's
Notes for H55
As CIHI prints them, with any note H55 takes from the headings above it.
Includes
- Nystagmus:• NOS• congenital• deprivation• dissociated• latent
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 H55 sits
- 1ChapterChapter 7: Diseases of the eye and adnexa (H00-H59)
- 2Block H55-H59Other disorders of eye and adnexa
- 3Valid code H55Nystagmus and other irregular eye movements
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 H55 mean?
H55 is the ICD-10-CA code for “Nystagmus and other irregular eye movements” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is H55 in ICD-10-CA?
H55 sits under H55-H59 Other disorders of eye and adnexa, within Chapter 7: Diseases of the eye and adnexa (H00-H59).
What coding notes apply to H55?
ICD-10-CA lists Includes, Excludes notes for H55, 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.