ICD-10-CM 2027
ICD-10 code for dissociated nystagmus
From the official ICD-10-CM alphabetic index entry “Nystagmus › dissociated”. Page updated September 29, 2026.
About coding dissociated nystagmus
The ICD-10-CM code for dissociated nystagmus is H55.04 (Dissociated nystagmus).
Within H55.0 (nystagmus), H55.04 is specifically for dissociated nystagmus. Related codes cover unspecified nystagmus (H55.00), congenital nystagmus (H55.01), latent nystagmus (H55.02), visual deprivation nystagmus (H55.03) 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.
Common questions about dissociated nystagmus ICD-10 codes
What is the ICD-10 code for dissociated nystagmus?
- H55.04 — Dissociated nystagmus.
Is H55.04 billable?
- Yes. H55.04 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H55.04 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H55.04 as a principal diagnosis.
Is H55.04 a CC or MCC?
- No. H55.04 is neither a CC nor an MCC under MS-DRG v44.0.