Nystagmus and other irregular eye movements
In Other disorders of eye and adnexa (H55-H57), chapter 7: Diseases of the Eye and Adnexa
9 billable codes under H55: none are a CC or MCC; none map to an HCC.
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers coding glaucoma by type, eye, and stage, including bilateral cases and stage changes, and coding blindness or low vision when the impairment category is undocumented.
All codes under H55
H55 can't be used on a claim. Pick a billable code below; grey headings group them.
- H55.0Nystagmus
- H55.00Unspecified nystagmus
- H55.01Congenital nystagmus
- H55.02Latent nystagmus
- H55.03Visual deprivation nystagmus
- H55.04Dissociated nystagmus
- H55.09Other forms of nystagmus
- H55.8Other irregular eye movements
- H55.81Deficient saccadic eye movements
- H55.82Deficient smooth pursuit eye movements
- H55.89Other irregular eye movements
H55 MS-DRGs
As the principal diagnosis, the billable codes under H55 group to MS-DRG 124, 125, or 123 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 124 Other Disorders of the Eye with MCC or Thrombolytic Agent (5 of 9 codes)
- DRG 125 Other Disorders of the Eye without MCC (5 of 9 codes)
- DRG 123 Neurological Eye Disorders (4 of 9 codes)
Other codes that refer to H55
Notes on these codes point to H55.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Eye Movement Disorders
When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.
Read more about eye movement disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.