# GREGORY HOLLIS GREGORY HOLLIS is an ADHD evaluation provider with an address in SAINT LOUIS, MO, United States. ## Details - Address: 12647 OLIVE BLVD SUITE 600, SAINT LOUIS, MO, 631416393 - Phone: [800-325-3982]() - National Provider Identifier (NPI): 1982855276 - Credentials: Ph.D. - Provider type: Clinical neuropsychologist - Source of the listing data: CMS NPI Registry, retrieved 2026-10-03, public, free ## Questions ### Where is GREGORY HOLLIS? GREGORY HOLLIS is at 12647 OLIVE BLVD SUITE 600, SAINT LOUIS, MO, 631416393. ### How do I contact GREGORY HOLLIS? To contact GREGORY HOLLIS, call 800-325-3982. ### Is GREGORY HOLLIS 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=1982855276), 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 SAINT LOUIS]() - [Clinical neuropsychologists in SAINT LOUIS]() - [More ADHD evaluation providers in SAINT LOUIS]()