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ICD-10-CM 2027 diagnosis code

H18.552Macular corneal dystrophy, left eye

✓ Billable / specific

H18.552 is a valid, billable ICD-10-CM code for macular corneal dystrophy, left eye. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H18.552

H18.552 is the ICD-10-CM diagnosis code for macular corneal dystrophy, left 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 H18.55 (macular corneal dystrophy), H18.552 is specifically for macular corneal dystrophy, left eye. Related codes cover right eye (H18.551), bilateral (H18.553) and unspecified eye (H18.559).

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 was added in FY2021, effective October 1, 2020.

Notes that apply from higher levels

Instructions written at a parent level also apply to H18.552.

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.

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
  • FY2021 (effective 10/1/2020): Added
  • No changes since FY2021.

Common questions about H18.552

Is H18.552 billable?

Yes. H18.552 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H18.552 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H18.552 as a principal diagnosis.

Is H18.552 a CC or MCC?

No. H18.552 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H18.552 group to?

H18.552 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.