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ICD-10-CM 2027 diagnosis code

H16.002Unspecified corneal ulcer, left eye

✓ Billable / specific

H16.002 is a valid, billable ICD-10-CM code for unspecified corneal ulcer, left 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 H16.002

H16.002 is the ICD-10-CM diagnosis code for unspecified corneal ulcer, left eye. It belongs to category H16 (keratitis), 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 H16.00 (unspecified corneal ulcer), H16.002 is specifically for unspecified corneal ulcer, left eye. Related codes cover right eye (H16.001), bilateral (H16.003) and unspecified eye (H16.009).

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 121 (Acute Major Eye Infections with CC/MCC, relative weight 1.2255) and DRG 122 (Acute Major Eye Infections without CC/MCC, relative weight 0.7406), 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 370.00 (corneal ulcer, unspecified).

Notes that apply from higher levels

Instructions written at a parent level also apply to H16.002.

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 →
  • 370.00Corneal ulcer, unspecifiedapproximate

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 H16.002

Is H16.002 billable?

Yes. H16.002 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H16.002 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H16.002 as a principal diagnosis.

Is H16.002 a CC or MCC?

No. H16.002 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H16.002 group to?

H16.002 is used in the MS-DRG v44.0 logic for MS-DRG 121 (Acute Major Eye Infections with CC/MCC) and MS-DRG 122 (Acute Major Eye Infections without CC/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 H16.002?

The CMS General Equivalence Mappings map H16.002 to ICD-9-CM 370.00.