Dennis Obrien, MD

Depression Treatment · Anxiety Treatment · Neurology · Psychiatry

21+ years in practiceNPI: 1811981699Licensed in IL

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Credentials & Recognition

Specialties

Depression TreatmentAnxiety TreatmentNeurologyPsychiatry

NPI sub-specialties

Psychiatry & Neurology, Neurology2084N0400X

Practice Signals

Editorial signals beyond credentials. Patient transparency over opacity. See methodology.

Mid-Level (PA/NP) Use

Doctor-led visits

Years in Practice

21+ years

Estimated from NPI enumeration date

Featured in PBCMMG Rankings

#2

Top Psychiatrists in Montana, 2026

Psychiatry · Montana · 2026

#4

Top Anxiety Treatment Specialists in Montana, 2026

Anxiety Treatment · Montana · 2026

#5

Top Depression Treatment Specialists in Montana, 2026

Depression Treatment · Montana · 2026

#15

Top Neurologists in Montana, 2026

Neurology · Montana · 2026

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Frequently Asked Questions about Dr. Dennis Obrien, MD

Where does Dr. Dennis Obrien, MD practice?+
Dr. Dennis Obrien, MD practices in Montana, MT. 801 N 29TH ST BILLINGS, MT 591010905.
What is Dr. Dennis Obrien, MD's phone number?+
Dr. Dennis Obrien, MD's practice phone is 406-238-2500. Office contact information is verified on the PBCMMG profile.
What does Dr. Dennis Obrien, MD specialize in?+
Dr. Dennis Obrien, MD's primary specialty is Psychiatry, with additional focus on Depression Treatment, Anxiety Treatment, Neurology.
Is Dr. Dennis Obrien, MD board certified?+
Board certification status for Dr. Dennis Obrien, MD has not been verified in the data sources PBCMMG uses (ABMS, state medical boards). The PBCMMG profile shows their current credential set.
How long has Dr. Dennis Obrien, MD been practicing?+
Dr. Dennis Obrien, MD has been in active practice for 21+ years, based on NPI enumeration and state licensing records.
What is Dr. Dennis Obrien, MD's NPI number?+
Dr. Dennis Obrien, MD's National Provider Identifier (NPI) is 1811981699, registered in the federal NPPES registry.

Profile maintained by Palm Beach County Medical Media Group, Inc. | Data verified from public registries (NPPES, ABMS, state medical boards). Methodology · Editorial Standards

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