Alexandra Vasiliou, NP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

95010808 Issued in CA

Practice address

5568 Gibraltar Dr
Pleasanton, CA 94588-8544

Phone

(925) 534-6500

NPI assigned

Jan 17, 2019

Last updated

Sep 29, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other names 1

• Miss Alexandra Peck Professional name

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: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

University Healthcare AllianceGroup PAC ID 6305748799, 334 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Stanford Health Care Tri-Valley Hospital, Pleasanton, CA, CCN 050283
• Stanford Health Care Hospital, Stanford, CA, CCN 050441

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: apeck442657@direct.stanfordhealthcare.org

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

• University Healthcare Alliance

  • Internal Medicine Physician
  • Newark, CA
  • NPI 1760531198
  Medicare reassignment Care Compare group NPD
• Ole Health

  dba CommuniCare OLE

  • Federally Qualified Health Center (FQHC)
  • Davis, CA
  • NPI 1558366823
  Medicare reassignment NPD
• Ole Health

  dba CommuniCare OLE

  • Federally Qualified Health Center (FQHC)
  • West Sacramento, CA
  • NPI 1710087515
  NPD
• Ole Health

  dba CommuniCare OLE

  • Federally Qualified Health Center (FQHC)
  • West Sacramento, CA
  • NPI 1881330579
  NPD
• Affinity Medical Group

  • Case Manager/Care Coordinator
  • Foster City, CA
  • NPI 1689708042
  NPD (past)

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

• Stanford Health Care

  dba SHC Radiation Oncology

  • Radiation Oncology Physician
  • Pleasanton, CA
  • NPI 1124561758

  Hospital

  Care Compare affiliation
• Stanford Health Care

  dba Stanford Health Care Emeryville 5800

  • General Acute Care Hospital
  • Emeryville, CA
  • NPI 1275076325
  Care Compare affiliation
• Stanford Health Care

  dba Stanford Health Care Emeryville 6121

  • General Acute Care Hospital
  • Emeryville, CA
  • NPI 1285177337
  Care Compare affiliation
• Stanford Health Care

  dba Stanford Medical Center A Trade Name for Stanford Health Care

  • General Acute Care Hospital
  • Stanford, CA
  • NPI 1437292927
  Care Compare affiliation
• Stanford Health Care

  dba Stanford Health Care Pleasanton 5565

  • General Acute Care Hospital
  • Pleasanton, CA
  • NPI 1467990465
  Care Compare affiliation
• Stanford Health Care

  dba Stanford Medical Center A Trade Name for Stanford Health Care

  • General Acute Care Hospital
  • Stanford, CA
  • NPI 1871543215
  Care Compare affiliation
• Stanford Health Care Tri-Valley

  • General Acute Care Hospital
  • Pleasanton, CA
  • NPI 1144389941
  Care Compare affiliation
• Stanford Life Flight

  • Air Ambulance
  • Stanford, CA
  • NPI 1114063203

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1547683200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790640000000",
    "number": "1275007742",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5568 GIBRALTAR DR",
            "city": "PLEASANTON",
            "state": "CA",
            "postal_code": "945888544",
            "telephone_number": "925-534-6500"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5568 GIBRALTAR DR",
            "city": "PLEASANTON",
            "state": "CA",
            "postal_code": "945888544",
            "telephone_number": "925-534-6500"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4111 Broadway",
            "address_purpose": "LOCATION",
            "city": "Oakland",
            "state": "CA",
            "postal_code": "946115111",
            "country_code": "US",
            "telephone_number": "510-451-4747",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "500 Jefferson Blvd Ste B180",
            "address_purpose": "LOCATION",
            "city": "West Sacramento",
            "state": "CA",
            "postal_code": "956052394",
            "country_code": "US",
            "telephone_number": "916-403-2900",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1220 Rossmoor Pkwy",
            "address_purpose": "LOCATION",
            "city": "Walnut Creek",
            "state": "CA",
            "postal_code": "945952501",
            "country_code": "US",
            "telephone_number": "925-939-9000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "VASILIOU",
        "first_name": "ALEXANDRA",
        "credential": "NP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-01-17",
        "last_updated": "2026-09-29",
        "certification_date": "2025-06-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "CA",
            "license": "95010808",
            "primary": true
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "95010808",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ALEXANDRA",
            "last_name": "PECK",
            "prefix": "MISS",
            "credential": "ALEX MALLIARIS",
            "code": "2",
            "type": "Professional Name"
        }
    ]
}

• Judith M Vanden Branden, R.N.P.
• Alyssa Chantel Vandenburgh
• Ralph Peter Vandersloot, DDS, MS
• Natasha Vashist
• Sonia P Vashist, D.D.S.
• Arelly Vasquez
• Diana Mae Vasquez
• Nichole Vasquez, OTR/L
• Roham Vatanparast, MD
• Sheila Elizabeth Vaughan, RN

• Nurse Practitioner in Pleasanton, CA
• Providers in Pleasanton, CA by specialty
• Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 29, 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.