ICD-10-CM 2027
ICD-10 code for nystagmus
From the official ICD-10-CM alphabetic index entry “Nystagmus”. Page updated September 29, 2026.
About coding nystagmus
The ICD-10-CM code for nystagmus is H55.00 (Unspecified nystagmus). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H55.00.
Within H55.0, choose H55.00 (Unspecified nystagmus) only when documentation doesn't support a more specific option: congenital nystagmus (H55.01), latent nystagmus (H55.02), visual deprivation nystagmus (H55.03), dissociated nystagmus (H55.04) and other forms of nystagmus (H55.09).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 123 (Neurological Eye Disorders, relative weight 0.822), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific nystagmus codes (official index)
- benign paroxysmal
- central positional H81.4 — Vertigo of central origin
- congenital H55.01 — Congenital nystagmus
- dissociated H55.04 — Dissociated nystagmus
- latent H55.02 — Latent nystagmus
- miners' H55.09 — Other forms of nystagmus
- positional
- benign paroxysmal H81.4 — Vertigo of central origin
- central H81.4 — Vertigo of central origin
- specified form NEC H55.09 — Other forms of nystagmus
- visual deprivation H55.03 — Visual deprivation nystagmus
Common questions about nystagmus ICD-10 codes
What is the ICD-10 code for nystagmus?
- H55.00 — Unspecified nystagmus. More specific codes apply when the documentation supports them: H81.4, H55.01, H55.04, H55.02 and others below.
What is the ICD-10 code for central positional nystagmus?
- H81.4 — Vertigo of central origin.
What is the ICD-10 code for congenital nystagmus?
- H55.01 — Congenital nystagmus.
What is the ICD-10 code for dissociated nystagmus?
- H55.04 — Dissociated nystagmus.
What is the ICD-10 code for latent nystagmus?
- H55.02 — Latent nystagmus.
What is the ICD-10 code for miners' nystagmus?
- H55.09 — Other forms of nystagmus.
What is the ICD-10 code for visual deprivation nystagmus?
- H55.03 — Visual deprivation nystagmus.
Is H55.00 billable?
- Yes. H55.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H55.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H55.00 as a principal diagnosis.
Is H55.00 a CC or MCC?
- No. H55.00 is neither a CC nor an MCC under MS-DRG v44.0.