G90.2 Horner's syndrome

Billable ICD-10-CM code, FY2026.

Applicable to

• Bernard(-Horner) syndrome
• Cervical sympathetic dystrophy or paralysis

Applies from G90 Disorders of autonomic nervous system

Excludes1 (never code together)

• dysfunction of the autonomic nervous system due to alcohol (G31.2)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 337.9 Unspecified disorder of autonomic nervous system (approximate)

Diagnosis Index entries for G90.2

• Bernard-Horner syndrome
• Claude Bernard-Horner syndrome
• Dystrophy, dystrophia › cervical sympathetic
• Dystrophy, dystrophia › sympathetic (reflex) › cervical
• Horner (-Claude Bernard) syndrome
• Syndrome › cervical (root) › sympathetic paralysis
• Syndrome › Horner's
• Syndrome › sympathetic › cervical paralysis

Nearby codes

• G90 Disorders of autonomic nervous system
• G90.0 Idiopathic peripheral autonomic neuropathy
• G90.01 Carotid sinus syncope
• G90.09 Other idiopathic peripheral autonomic neuropathy
• G90.1 Familial dysautonomia [Riley-Day]
• G90.2 Horner's syndrome (this code)
• G90.3 Multi-system degeneration of the autonomic nervous system
• G90.4 Autonomic dysreflexia
• G90.5 Complex regional pain syndrome I (CRPS I)
• G90.50 Complex regional pain syndrome I, unspecified
• G90.51 Complex regional pain syndrome I of upper limb