ICD-10-CM 2027
ICD-10 code for cornea disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › cornea”. Page updated September 29, 2026.
About coding cornea disorder
The ICD-10-CM code for cornea disorder is H18.9 (Unspecified disorder of cornea). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H18.9.
Within H18, choose H18.9 (Unspecified disorder of cornea) only when documentation doesn't support a more specific option: corneal pigmentations and deposits (H18.0), bullous keratopathy (H18.1), other and unspecified corneal edema (H18.2), changes of corneal membranes (H18.3), corneal degeneration (H18.4), hereditary corneal dystrophies (H18.5), Keratoconus (H18.6), other and unspecified corneal deformities (H18.7) and 1 more.
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.
More specific cornea disorder codes (official index)
Common questions about cornea disorder ICD-10 codes
What is the ICD-10 code for cornea disorder?
- H18.9 — Unspecified disorder of cornea. More specific codes apply when the documentation supports them: H18.82, H18.89.
Is H18.9 billable?
- Yes. H18.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H18.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H18.9 as a principal diagnosis.
Is H18.9 a CC or MCC?
- No. H18.9 is neither a CC nor an MCC under MS-DRG v44.0.