Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes G00-G99 – Diseases of the nervous system (G00-G99) > 2024 ICD-10-CM Codes G40-G47 – Episodic and paroxysmal disorders (G40-G47) > 2024 ICD-10-CM Codes G47 – Sleep disorders (G47) > 2024 ICD-10-CM Codes G47.4 – Narcolepsy and cataplexy (G47.4)