Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALEXANDRA VASILIOU NP
NPI 1275007742
Nurse Practitioner in Pleasanton, CA

Q: What is Alexandra Vasiliou's NPI number?

The NPI number for Alexandra Vasiliou is 1275007742. It was assigned to this individual provider in the NPPES registry on January 17, 2019. The provider is also known as Miss Alexandra Peck Alex Malliaris.

Q: What is Alexandra Vasiliou's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Active since January 17, 2019PECOS EnrolledAccepts Medicare Assignment

5568 GIBRALTAR DR, PLEASANTON, CA 94588(925) 534-6500 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 29, 2026, Jun 11, 2025, May 30, 2025 and 3 more (6 updates tracked since 2019).

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About Alexandra Vasiliou Np NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXANDRA VASILIOU NP (NPI 1275007742) is an individual nurse practitioner in Pleasanton, California, licensed in California (95010808) and active in the NPI registry since January 2019. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2018).

NPPES Registry Identity

NPI1275007742

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameALEXANDRA VASILIOUCredential: NP

Location Address5568 GIBRALTAR DRPleasanton, CA 94588-8544

Mailing Address5568 Gibraltar DrPleasanton, CA 94588-8544 · (925) 534-6500

Phone(925) 534-6500

Sole ProprietorNo

Medical School CMSOtherGraduated 2018

Enumeration DateJanuary 17, 2019

Last NPPES UpdateSeptember 29, 20266 updates tracked since enumeration

NPPES CertifiedJune 11, 2025

✔ NPI 1275007742 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

License✔ Licensed in CA · 95010808

Definition

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Also ListedNurse Practitioner · FamilyTaxonomy 363LF0000X · License 95010808 (CA)

5568 GIBRALTAR DR, Pleasanton, CA 94588

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Other Names 1

Professional Name (2)Miss Alexandra Peck Alex Malliaris

Secondary Practice Locations 3

Location 14111 BroadwayOakland, CA 94611-5111 · Phone (510) 451-4747

Location 2500 Jefferson Blvd Ste B180West Sacramento, CA 95605-2394 · Phone (916) 403-2900

Location 31220 Rossmoor PkwyWalnut Creek, CA 94595-2501 · Phone (925) 939-9000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alexandra Vasiliou Np is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6800214511

PECOS Enrollment IDI20200911002670

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Alexandra Vasiliou reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Healthcare Alliance

14 mi

Internal Medicine

7999 GATEWAY BLVD STE 200
Newark, CA 94560

Reassigned Medicare billing, California enrollment
435 clinicians in this Medicare group

NPI 1760531198 (888) 924-1036

Ole Health

61 mi

Federally Qualified Health Center (FQHC)

2051 JOHN JONES RD
Davis, CA 95616

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Communicare Health Centers
64 clinicians in this Medicare group

NPI 1558366823 (530) 758-2060

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

132 services113 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

103 services92 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

18 services18 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

17 services17 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

17 services17 patients

Automated urinalysis test 81003

An automated urinalysis test is a routine examination that checks your urine for various substances. It can help identify potential health issues such as kidney problems or diabetes. The test uses a machine to analyze a small urine sample, providing quick and accurate results.

14 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94588 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$104.51 typical visit price

range $69.00 – $202.35

Typical copayment $26.12 (range $17.25 – $50.58)

Most-billed visit code 99203

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 12

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ADNAAN FUAD SHERIFF D.O.

Family Medicine