H18.4 vs H18.83

H18.4 (Corneal degeneration) compared with H18.83 (Recurrent erosion of cornea), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. H18.4 carries an Excludes1 note covering H18.83: “recurrent erosion of cornea (H18.83-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	H18.4Corneal degeneration	H18.83Recurrent erosion of cornea
Billing status	Non-billable header Report instead: H18.40, H18.411, H18.412, H18.413, H18.419	Non-billable header Report instead: H18.831, H18.832, H18.833, H18.839
Classification	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)
Definition	Corneal degeneration is a non-billable ICD-10-CM category code (H18.4).	Recurrent erosion of cornea is a non-billable ICD-10-CM category code (H18.83).

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources