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ALL MEDICAL CODES IN CATEGORY G40-G47, Episodic and paroxysmal disorders

2025 ICD-10-CM code G45.4

Transient global amnesia. A rare condition causing a brief episode of memory loss and confusion, not due to other neurological conditions like epilepsy, stroke, or head injury.

2025 ICD-10-CM code G44.53

Primary thunderclap headache. This refers to a sudden, severe headache reaching peak intensity within 60 seconds.

2025 ICD-10-CM code G44

Other headache syndromes. Excludes1: headache NOS (R51.9). Excludes2: atypical facial pain (G50.1), headache due to lumbar puncture (G97.1), migraines (G43.-), trigeminal neuralgia (G50.0).

2025 ICD-10-CM code G46.3

Brainstem stroke syndrome, also known as Benedikt, Claude, Foville, Millard-Gubler, Wallenberg, or Weber syndrome.

2025 ICD-10-CM code G40.812

Lennox-Gastaut syndrome, a severe form of epilepsy in children, characterized by various seizure types, cognitive impairment, and abnormal EEG findings. This specific code indicates that the seizures are not intractable (can be controlled with treatment) and without status epilepticus (seizures are not prolonged).

2025 ICD-10-CM code G44.81

A primary headache disorder that occurs only during sleep, causing the patient to wake up. It typically affects middle-aged women.