H18.4

Header — not billable

Corneal degeneration

The ICD-10 code for corneal degeneration is H18.4.

H18.4 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 8 more specific codes below.

Clinical notes

Excludes1 (not coded here)

An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).

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

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
•Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

H18.4

Clinical notes

Excludes1 (not coded here)

Documentation support

Child codes under H18.4

Related codes in this category