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ICD-10-CM 2027 diagnosis code

H55.89Other irregular eye movements

✓ Billable / specific

H55.89 is a valid, billable ICD-10-CM code for other irregular eye movements. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Eye movements irregular.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H55.89

H55.89 is the ICD-10-CM diagnosis code for other irregular eye movements. It belongs to category H55 (nystagmus and other irregular eye movements), block H55-H57 (other disorders of eye and adnexa) and chapter 7 (diseases of the eye and adnexa). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within H55.8, choose H55.89 (Other irregular eye movements) only when documentation doesn't support a more specific option: Deficient saccadic eye movements (H55.81) and Deficient smooth pursuit eye movements (H55.82).

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 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), 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.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 379.59 (other irregularities of eye movements).

Notes that apply from higher levels

Instructions written at a parent level also apply to H55.89.

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H55.89.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

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  • 379.59Other irregularities of eye movementsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H55.89

Is H55.89 billable?

Yes. H55.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H55.89 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H55.89 as a principal diagnosis.

Is H55.89 a CC or MCC?

No. H55.89 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H55.89 group to?

H55.89 is used in the MS-DRG v44.0 logic for MS-DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent) and MS-DRG 125 (Other Disorders of the Eye without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for H55.89?

The CMS General Equivalence Mappings map H55.89 to ICD-9-CM 379.59.