Amy Haruko Matayoshi, M.D.

Primary specialty

Nephrology PhysicianTaxonomy code 207RN0300X

License

A60790 Issued in CA

Practice address

3300 Vista Way
Suite B
Oceanside, CA 92056-3752

Phone

(760) 967-9900

Fax

(760) 967-6769

NPI assigned

Feb 14, 2006

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 3

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

NephrologyAlso: Internal Medicine

Education

University of Hawaii John a. Burns School of Medicine, 1995

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Balboa Nephrology Medical Group IncGroup PAC ID 9638164015, 78 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Fresenius Medical Care North Coast Kidney Center Dialysis facility, Oceanside, CA, CCN 052708
• Fresenius Medical Care Buena Creek Dialysis facility, Vista, CA, CCN 052842
• Tri-City Medical Center Hospital, Oceanside, CA, CCN 050128

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles (5 of 6)

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: amatayoshi31808@scrippshlth.medalliesdirect.net
• Direct secure messaging: amatayoshi10436@direct.acumenmd.com

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.

• Balboa Nephrology Medical Group, Inc.

  • Nephrology Physician
  • San Diego, CA
  • NPI 1316997505

  CA, Nephrology

  Medicare reassignment Care Compare group NPD
• Balboa Nephrology Medical Group,Inc.

  • Ambulatory Surgical Clinic/Center
  • San Diego, CA
  • NPI 1598276404
  NPD
• Scripps Health

  • General Acute Care Hospital
  • San Diego, CA
  • NPI 1487928891
  NPD
• Scripps Health

  • Clinical Medical Laboratory
  • La Jolla, CA
  • NPI 1427034990
  NPD (past)
• Tri-City Hospital

  • General Acute Care Hospital
  • Oceanside, CA
  • NPI 1801861190
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Fresenius Medical Care Northcoast, LLC

  • End-Stage Renal Disease (ESRD) Treatment Clinic/Center
  • Vista, CA
  • NPI 1336538404

  Dialysis facility

  Care Compare affiliation Name & address match
• Tri-City Hospital

  • General Acute Care Hospital
  • Oceanside, CA
  • NPI 1801861190

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1139875200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769990400000",
    "number": "1417921982",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "9373 HAZARD WAY STE 200",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921231226",
            "telephone_number": "858-810-0000",
            "fax_number": "858-268-1911"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3300 VISTA WAY",
            "address_2": "SUITE B",
            "city": "OCEANSIDE",
            "state": "CA",
            "postal_code": "920563752",
            "telephone_number": "760-967-9900",
            "fax_number": "760-967-6769"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MATAYOSHI",
        "first_name": "AMY",
        "middle_name": "HARUKO",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-02-14",
        "last_updated": "2026-02-02",
        "certification_date": "2026-02-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "CA",
            "license": "A60790",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "CA LICENSE",
            "identifier": "A60780",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "NO. CALIFORNIA PTAN",
            "identifier": "CA139681",
            "state": "CA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "SO. CALIFORNIA PTAN",
            "identifier": "CB226292",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Robert Tyree Mason Jr., LVN
• Cassidy Anne Massengill Smith, SUDCC 1
• Maurice A Massoud, RPH
• Jaron Michael Mastroianni
• Madalina Masyuk, RPH
• Marie Mateo, CNM
• Robert Irvin Mathes
• Gulalai Matin
• Malia Matteo, ATC
• Karen Becerra Matthews-Penagos, DDS

• Nephrology Physician in Oceanside, CA
• Providers in Oceanside, CA by specialty
• Nephrology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 2, 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.