H16.9 Unspecified keratitis

Billable ICD-10-CM code, FY2026.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 370.9 Unspecified keratitis

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Diagnosis Index entries for H16.9

• Keratitis (nodular) (nonulcerative) (simple) (zonular)

Nearby codes

• H16.441 Deep vascularization of cornea, right eye
• H16.442 Deep vascularization of cornea, left eye
• H16.443 Deep vascularization of cornea, bilateral
• H16.449 Deep vascularization of cornea, unspecified eye
• H16.8 Other keratitis
• H16.9 Unspecified keratitis (this code)