Amast Medical Associates, PC

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

Legal business name

AMAST MEDICAL ASSOCIATES, PC

Doing business as

Amast Medical Associates

Practice address

166 Geary St
Ste 1500 #1717
San Francisco, CA 94108-5628

Phone

(415) 745-2855

NPI assigned

Jun 10, 2025

Last updated

Dec 6, 2025By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Dr. Jack Hale Buchanan, MD, PHDNPI 1093343014

Title

Co-Owner & Physician

Phone

(415) 745-2855

Specialties & licenses 1

Addresses

Other names 1

• Amast Medical Associates Doing business as

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

Practitioners 2

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Jack Buchanan, MD, PHD

  • Psychiatry Physician
  • San Francisco, CA
  • NPI 1093343014
  Medicare reassignment Care Compare group NPD Authorized official
• Michael Thanh Dinh

  • Psychiatry Physician
  • Palo Alto, CA
  • NPI 1356978639
  Medicare reassignment Care Compare group NPD

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

{
    "created_epoch": "1749513600000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1764979200000",
    "number": "1184519241",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "166 GEARY ST",
            "address_2": "STE 1500 #1717",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941085628",
            "telephone_number": "415-745-2855"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "166 GEARY ST",
            "address_2": "STE 1500 #1717",
            "city": "SAN FRANCISCO",
            "state": "CA",
            "postal_code": "941085628",
            "telephone_number": "415-745-2855"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "AMAST MEDICAL ASSOCIATES, PC",
        "organizational_subpart": "NO",
        "enumeration_date": "2025-06-10",
        "last_updated": "2025-12-06",
        "certification_date": "2025-12-06",
        "status": "A",
        "authorized_official_last_name": "BUCHANAN",
        "authorized_official_first_name": "JACK",
        "authorized_official_middle_name": "HALE",
        "authorized_official_title_or_position": "CO-OWNER & PHYSICIAN",
        "authorized_official_telephone_number": "415-745-2855",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "MD, PHD"
    },
    "taxonomies": [
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Amast Medical Associates",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

• David Amarathithada
• Nayeli Amaro
• Richard Amaro
• Rosana Marie Amaro, AUD
• Jhene Lilia Amasa, BCBA
• Sandra Amat, MFT
• Angelica Amatangelo, DDS
• Sophia Amato
• Stas Salerno Amato
• Vanessa Amaya

• Psychiatry Physician in San Francisco, CA
• Providers in San Francisco, CA by specialty
• Psychiatry Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 6, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.