Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Dennis Obrien, MD

Individual provider Neurology Physician · NPI 1811981699

Dr. Dennis Obrien, MD is a Neurology Physician in Billings, Montana. Licensed in Illinois. Registered with an NPI since 2005.

Licensed in
IL
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

801 N 29th St
Billings, MT 59101-0905 Not confirmed with CMS for 11 years — call before visiting
Phone: (406) 238-2500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurology Physician (primary) Taxonomy 2084N0400X · Licence 36099965 (IL)

Record details

NPI number1811981699
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 7, 2005
Last updated in NPPESDecember 11, 2014

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