John Matthew O'Brien, PH.D.

Primary specialty

Clinical PsychologistTaxonomy code 103TC0700X

License

PS932 Issued in ME

Practice address

465 Congress St
Ste 700
Portland, ME 04101-3539

Phone

(207) 773-2828

Fax

(207) 761-8150

NPI assigned

Jun 17, 2005

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in ME

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Clinical Psychologist

Education

Other, 1996

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Philosophy

State licenses

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Mental Health Associates of Maine LLC

  • Psychologist
  • Portland, ME
  • NPI 1508936196
  Medicare reassignment
• Claire Oppenheim LLC

  • Clinical Social Worker
  • Portland, ME
  • NPI 1144466152
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1118966400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1720083504",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "465 CONGRESS ST",
            "address_2": "STE 700",
            "city": "PORTLAND",
            "state": "ME",
            "postal_code": "041013539",
            "telephone_number": "207-773-2828",
            "fax_number": "207-761-8150"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "465 CONGRESS ST",
            "address_2": "STE 700",
            "city": "PORTLAND",
            "state": "ME",
            "postal_code": "041013539",
            "telephone_number": "207-773-2828",
            "fax_number": "207-761-8150"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "JOHN",
        "middle_name": "MATTHEW",
        "name_prefix": "Dr.",
        "credential": "PH.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-06-17",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "103TC0700X",
            "taxonomy_group": "",
            "desc": "Psychologist, Clinical",
            "state": "ME",
            "license": "PS932",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Adam O'Brien, DO
• Cashel O'Brien, DO
• Daniel Kevin O'Brien, NP
• Grace Ann O'Brien, DO
• Jillian R O'Brien, OTR/L
• Morgan E O'Brien, APRN - NNP
• Andrew O'Connell-Shevenell, LMT
• Alane B O'Connor, DNP
• Anne Marie O'Connor, MD
• Cassandra O'Connor, FNP-BC

• Clinical Psychologist in Portland, ME
• Providers in Portland, ME by specialty
• Clinical Psychologist in Maine

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.