A50.31 Late congenital syphilitic interstitial keratitis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from A50.3 Late congenital syphilitic oculopathy

Excludes1 (never code together)

• Hutchinson's triad (A50.53)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 090.3 Syphilitic interstitial keratitis (approximate)

Code annotations containing back-references to A50.31

Back-references to A50

• Code First: J99 Respiratory disorders in diseases classified elsewhere ("congenital syphilis (A50.-)")
• Type 2 Excludes: N34 Urethritis and urethral syndrome ("urethritis in diseases with a predominantly sexual mode of transmission (A50-A64)")
• Type 2 Excludes: P37 Other congenital infectious and parasitic diseases ("congenital syphilis (A50.-)")

Diagnosis Index entries for A50.31

• Keratitis (nodular) (nonulcerative) (simple) (zonular) › in (due to) › syphilis
• Keratitis (nodular) (nonulcerative) (simple) (zonular) › interstitial (nonsyphilitic) › syphilitic (congenital) (late)
• Keratitis (nodular) (nonulcerative) (simple) (zonular) › punctata › syphilitic (profunda)
• Keratitis (nodular) (nonulcerative) (simple) (zonular) › syphilitic (congenital) (prenatal)
• Syphilis, syphilitic (acquired) › congenital › interstitial keratitis
• Syphilis, syphilitic (acquired) › congenital › late, or 2 years or more after birth NEC › interstitial keratitis
• Syphilis, syphilitic (acquired) › keratitis (congenital) (interstitial) (late)

Nearby codes

• A50.09 Other early congenital syphilis, symptomatic
• A50.1 Early congenital syphilis, latent
• A50.2 Early congenital syphilis, unspecified
• A50.3 Late congenital syphilitic oculopathy
• A50.30 Late congenital syphilitic oculopathy, unspecified
• A50.31 Late congenital syphilitic interstitial keratitis (this code)
• A50.32 Late congenital syphilitic chorioretinitis
• A50.39 Other late congenital syphilitic oculopathy
• A50.4 Late congenital neurosyphilis [juvenile neurosyphilis]
• A50.40 Late congenital neurosyphilis, unspecified
• A50.41 Late congenital syphilitic meningitis