Table 3 Mapping of neurological disease categories to ICD-10 category codes and their descriptions.

Disease category	ICD-10 code^a	ICD-10 code description
Consciousness	R41	Other symptoms and signs involving cognitive functions and awareness
Coordination	R27	Other lack of coordination
Dizziness	R42	Dizziness and giddiness
Headache	G44	Other headache syndromes
Inflammatory	G03	Meningitis due to other and unspecified causes
Inflammatory	G04	Encephalitis, myelitis and encephalomyelitis
Muscle	G72	Other and unspecified myopathies
Muscle	M60	Myositis
Neuropathy	G61	Inflammatory polyneuropathy
Neuropathy	G65	Sequelae of inflammatory and toxic polyneuropathies
Neuropathy	R43	Disturbances of smell and taste
Other	G93	Other disorders of the brain
Psychiatric	F29	Unspecified psychosis not due to a substance or known physiological condition
Seizure	G40	Epilepsy and recurrent seizures
Vascular	G45	Transient cerebral ischemic attacks and related syndromes
Vascular	G46	Vascular syndromes of brain in cerebrovascular disease
Vascular	I60	Nontraumatic subarachnoid hemorrhage
Vascular	I61	Nontraumatic intracerebral hemorrhage
Vascular	I62	Other and unspecified nontraumatic intracranial hemorrhage
Vascular	I67	Other cerebrovascular diseases
Vision	H54	Blindness and low vision

^aTo standardize the collection of ICD codes across diverse contributing healthcare systems and to mitigate coding discrepancies, we used ICD codes at the categorical level (e.g., the first 3 alphanumeric characters before the decimal point for ICD-10).

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