Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. John Matthew O'Brien, PHD

Individual provider Clinical Psychologist · NPI 1720083504

Dr. John Matthew O'Brien, PHD is a Clinical Psychologist in Portland, Maine. Qualified in 1996, 30 years ago. Accepts Medicare assignment and offers telehealth. Licensed in Maine.

Years since qualifying
30
Licensed in
ME
In the registry since
2005
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

465 Congress St Ste 700
Portland, ME 04101-3539
Phone: (207) 773-2828
Fax: (207) 761-8150
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PS932 (ME)

Record details

NPI number1720083504
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedJune 17, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1996 (30 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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