1. Home
  2. Directory
  3. Montana
  4. Billings
  5. Psychiatry Neurology
  6. NPI Profile

DR. DENNIS OBRIEN MD
NPI 1811981699
Psychiatry & Neurology - Neurology in Billings, MT

Active since September 07, 2005
801 N 29TH ST, BILLINGS, MT 59101(406) 238-2500 Get Directions Write a Review

NPPES record last updated: December 11, 2014. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Dennis Obrien Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DENNIS OBRIEN MD (NPI 1811981699) is an individual neurology provider in Billings, Montana, licensed in Illinois (36099965) and active in the NPI registry since September 2005.

NPPES Registry Identity

NPI1811981699
Entity TypeIndividualMale
Primary Taxonomy2084N0400X
Provider Legal NameDR. DENNIS OBRIENCredential: MD
Location Address801 N 29TH STBillings, MT 59101-0905
Mailing AddressPo Box 35100Billings, MT 59107-5100 · (406) 238-2500
Phone(406) 238-2500
Sole ProprietorNo
Enumeration DateSeptember 7, 2005
Last NPPES UpdateDecember 11, 2014
✔ NPI 1811981699 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
License✔ Licensed in IL · 36099965
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
801 N 29TH ST, Billings, MT 59101
Open in Google Maps ↗

Other Identifiers 5

Other000098136MT · Bcbs Pin
Medicare PINP00444285MT
Medicare PIN1153260003MT
Medicare PIN011001097MT
Medicare PIN011001096MT

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

AMANDA NEWBERN LANGVE PT
Physical Therapist
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500
KIRK KENFIELD PA
Physician Assistant (Surgical)
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500
ELIZABETH V CONNOR MD
Obstetrics & Gynecology (Gynecologic Oncology)
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-5000
ALEXANDER RAMSEY PA-C
Physician Assistant
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500
BILLINGS CLINIC
Occupational Therapist
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500
JERALD A. BELL MD
Ophthalmology
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2501
MELANIE SCHMITZ PA-C
Physician Assistant (Surgical)
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500
AARON JAMES AUDET M.D.
Family Medicine
801 N 29TH ST
BILLINGS, MT 59101
Yellowstone County (406) 238-2500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dennis Obrien's NPI number?

The NPI number for Dennis Obrien is 1811981699. It was assigned to this individual provider in the NPPES registry on September 7, 2005.

Where is Dennis Obrien located?

Dennis Obrien practices at 801 N 29th St, Billings, MT 59101. The listed phone number is (406) 238-2500.

What is Dennis Obrien's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

When was this NPI record last updated?

The NPPES record for Dennis Obrien was last updated on December 11, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.