CNSA Neurology "an academic neurology practice" Patient Portal - Click Here: Jon M Gustafson MD MBS Neurologist 308 North Greenwood Avenue Fort Smith, AR 72901 479-434-2743 844-454-8351 fax: Physicians and Clinics - Referrals FAXed to 844-454-8351. Include a clear referral question with recent records along with the usual demographic information..