H18.4Header code — not billable
Corneal degeneration
- Chapter
- 7. Diseases of the eye and adnexa
- Category
- H18
- Effective date
- October 1, 2026
Related codes in category H18
H18Other disorders of corneaH18.0Corneal pigmentations and depositsH18.00Unspecified corneal depositH18.001Unspecified corneal deposit, right eyeYesH18.002Unspecified corneal deposit, left eyeYesH18.003Unspecified corneal deposit, bilateralYesH18.009Unspecified corneal deposit, unspecified eyeYesH18.01Anterior corneal pigmentationsH18.011Anterior corneal pigmentations, right eyeYesH18.012Anterior corneal pigmentations, left eyeYesH18.013Anterior corneal pigmentations, bilateralYesH18.019Anterior corneal pigmentations, unspecified eyeYes
Frequently asked questions
What is ICD-10 code H18.4?
H18.4 is an ICD-10-CM diagnosis code for Corneal degeneration.
Is H18.4 a billable code?
No. H18.4 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is H18.4 in?
H18.4 falls under Chapter 7: Diseases of the eye and adnexa.
When did H18.4 become effective?
H18.4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to H18.4?
H18.4 belongs to category H18, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.