# MARK JOHNSON MARK JOHNSON is an ADHD evaluation provider with an address in GREAT FALLS, MT, United States. ## Details - Address: 400 15TH AVE S STE 205, GREAT FALLS, MT, 594054375 - Phone: [406-731-8888]() - National Provider Identifier (NPI): 1932100518 - Credentials: PhD - Provider type: Clinical neuropsychologist - Source of the listing data: CMS NPI Registry, retrieved 2026-10-03, public, free ## Questions ### Where is MARK JOHNSON? MARK JOHNSON is at 400 15TH AVE S STE 205, GREAT FALLS, MT, 594054375. ### How do I contact MARK JOHNSON? To contact MARK JOHNSON, call 406-731-8888. ### Is MARK JOHNSON accepting new patients? That is not in the registry data. Call the phone number on the listing and ask about availability, wait times and insurance. ## Source From [CMS NPI Registry (National Plan and Provider Enumeration System)](https://npiregistry.cms.hhs.gov/api/?version=2.1&number=1932100518), license US government public data. CMS publishes NPPES provider data for open access under its data dissemination notice., checked 2026-10-06. Last updated October 6, 2026. ## Links - This ADHD evaluation provider on the [web page]() - [ADHD evaluations in GREAT FALLS]() - [Clinical neuropsychologists in GREAT FALLS]() - [More ADHD evaluation providers in GREAT FALLS]()