H18.40 Unspecified corneal degeneration

Billable ICD-10-CM code, FY2026.

Applies from H18.4 Corneal degeneration

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 124-125 in MDC 02.

Approximate ICD-9-CM (GEMs)

• 371.40 Corneal degeneration, unspecified

Diagnosis Index entries for H18.40

• Degeneration, degenerative › cornea

Nearby codes

• H18.331 Rupture in Descemet's membrane, right eye
• H18.332 Rupture in Descemet's membrane, left eye
• H18.333 Rupture in Descemet's membrane, bilateral
• H18.339 Rupture in Descemet's membrane, unspecified eye
• H18.4 Corneal degeneration
• H18.40 Unspecified corneal degeneration (this code)
• H18.41 Arcus senilis
• H18.411 Arcus senilis, right eye
• H18.412 Arcus senilis, left eye
• H18.413 Arcus senilis, bilateral
• H18.419 Arcus senilis, unspecified eye