H18.4
ICD-10Non-billable categoryCorneal degeneration
Official ICD-10-CM descriptor (FY2026)
Corneal degeneration
H18.4 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- Mooren's ulcer (H16.0-)
- recurrent erosion of cornea (H18.83-)
ICD-10-CM FY2026 defines 8 codes beneath H18.4. See the ICD-10-CM index for what this site publishes.
Related codes in H18
- H18.0Corneal pigmentations and depositscategory
- H18.1Bullous keratopathycategory
- H18.2Other and unspecified corneal edemacategory
- H18.3Changes of corneal membranescategory
- H18.5Hereditary corneal dystrophiescategory
- H18.6Keratoconuscategory
- H18.7Other and unspecified corneal deformitiescategory
- H18.8Other specified disorders of corneacategory
- H18.9Unspecified disorder of cornea
Where this code sits
- Parent code
- H18
Krasyn AI Coder
Get code suggestions automatically as you type notes. Free for 50 analyses.
Install for Chrome — freeSource
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.