G59 Mononeuropathy in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• diabetic mononeuropathy (E08-E13 with .41)
• syphilitic nerve paralysis (A52.19)
• syphilitic neuritis (A52.15)
• tuberculous mononeuropathy (A17.83)

Code first

• underlying disease

Applies from G59 Mononeuropathy in diseases classified elsewhere

Excludes1 (never code together)

• diabetic mononeuropathy (E08-E13 with .41)
• syphilitic nerve paralysis (A52.19)
• syphilitic neuritis (A52.15)
• tuberculous mononeuropathy (A17.83)

Code first

• underlying disease

MS-DRG index

Defines the logic of DRG(s) 073-074 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 355.9 Mononeuritis of unspecified site (approximate)

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

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Nearby codes

• G59 Mononeuropathy in diseases classified elsewhere (this code)