Montana's list of qualifying conditions is a bit more restrictive than other states:

Glaucoma

HIV or AIDS (must be adversely affecting patient's health status)

Cancer

Wasting syndrome or cachexia

Persistent pain of severe intensity that significantly interferes with daily activities and is documented by the patient's treating physician

Intractable seizures or epilepsy

Intractable nausea or vomiting

Crohn's disease

Multiple sclerosis

Painful peripheral neuropathy

Hospice care

A central nervous system disorder resulting in chronic, painful spasticity or muscle spasms

PTSD