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ICD-10-CM 2027 diagnosis code

H18.59Other hereditary corneal dystrophies

Not billable — use a more specific code

H18.59 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

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 H18.59

H18.59 is the ICD-10-CM diagnosis code for other hereditary corneal dystrophies. 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 a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H18.5, choose H18.59 (Other hereditary corneal dystrophies) only when documentation doesn't support a more specific option: unspecified hereditary corneal dystrophies (H18.50), Endothelial corneal dystrophy (H18.51), epithelial (juvenile) corneal dystrophy (H18.52), Granular corneal dystrophy (H18.53), Lattice corneal dystrophy (H18.54) and macular corneal dystrophy (H18.55).

To report this condition, pick the subcode that matches the documentation: H18.591 (right eye), H18.592 (left eye), H18.593 (bilateral) and H18.599 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2021 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 371.52 (other anterior corneal dystrophies).

Specific codes under H18.59

Notes that apply from higher levels

Instructions written at a parent level also apply to H18.59.

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 H18.59.

ICD-9-CM equivalent

Converter →
  • 371.52Other anterior corneal dystrophiesapproximate

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)
  • FY2021 (effective 10/1/2020): Expanded — no longer billable

Common questions about H18.59

Is H18.59 billable?

No. H18.59 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for H18.59?

The CMS General Equivalence Mappings map H18.59 to ICD-9-CM 371.52.