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ICD-10-CM 2027 diagnosis code

H18.899Other specified disorders of cornea, unspecified eye

✓ Billable / specific

H18.899 is a valid, billable ICD-10-CM code for other specified disorders of cornea, unspecified eye. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 H18.899

H18.899 is the ICD-10-CM diagnosis code for other specified disorders of cornea, unspecified eye. It belongs to category H18 (other disorders of cornea), block H15-H22 (disorders of sclera, cornea, iris and ciliary body) 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 H18.89, choose H18.899 (unspecified eye) only when documentation doesn't support a more specific option: right eye (H18.891), left eye (H18.892) and bilateral (H18.893).

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 371.89 (other corneal disorders).

Notes that apply from higher levels

Instructions written at a parent level also apply to H18.899.

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

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

Converter →
  • 371.89Other corneal disordersapproximate

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 H18.899

Is H18.899 billable?

Yes. H18.899 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H18.899 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H18.899 as a principal diagnosis.

Is H18.899 a CC or MCC?

No. H18.899 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H18.899 group to?

H18.899 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 H18.899?

The CMS General Equivalence Mappings map H18.899 to ICD-9-CM 371.89.