H18.4

Non-billable

Corneal degeneration

H18.4 is the ICD-10-CM code for Corneal degeneration. It is a non-billable category code — use a more specific child code such as H18.40 for billing.

Status
Header (non-billable)
Chapter
H00-H59
Parent
H18
Subcodes
8
Edition
FY2026

H00-H59 Diseases of the eye and adnexa

Excludes1 — not coded here

  • Mooren's ulcer (H16.0-)
  • recurrent erosion of cornea (H18.83-)

Frequently asked questions

What is ICD-10 code H18.4?
H18.4 is the ICD-10-CM code for "Corneal degeneration". It falls under H00-H59 Diseases of the eye and adnexa.
Is H18.4 a billable code?
No — H18.4 is a non-billable header code. Use a more specific child code (such as H18.40) for billing.
What are the subcodes of H18.4?
H18.4 has 8 more specific child codes, including H18.40, H18.41, H18.42.
What is excluded from H18.4?
Excludes1 (not coded here): Mooren's ulcer (H16.0-); recurrent erosion of cornea (H18.83-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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