Ilaria Oliver Mastroserio, PA-C - Medicare Physician Assistant in Walnut Creek, CA

  1. Home
  2. Physician Assistant
  3. CA
  4. Walnut Creek
Ilaria Oliver Mastroserio, PA-C is a medicare enrolled "Physician Assistant" in Walnut Creek, California. She graduated from nursing school in 2019 and has 7 years of diverse experience with area of expertise as Physician Assistant. She is a member of the group practice John Muir Physician Network and her current practice location is 177 La Casa Via Ste 390, Walnut Creek, California. You can reach out to her office (for appointments etc.) via phone at (925) 692-5610.

Ilaria Oliver Mastroserio is licensed to practice in NU (license number ) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1376197590.

Contact Information

Ilaria Oliver Mastroserio, PA-C
177 La Casa Via Ste 390,
Walnut Creek, CA 94598-6101
(925) 692-5610
Not Available

Map and Direction




Provider's Profile

Full NameIlaria Oliver Mastroserio
GenderFemale
SpecialityPhysician Assistant
Experience7 Years
Location177 La Casa Via Ste 390, Walnut Creek, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Ilaria Oliver Mastroserio graduated from nursing school in 2019
  NPI Data:
  • NPI Number: 1376197590
  • Provider Enumeration Date: 07/25/2019
  • Last Update Date: 05/22/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 0840521779
  • Enrollment ID: I20231023003598

Medical Identifiers

Medical identifiers for Ilaria Oliver Mastroserio such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1376197590NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363A00000XPhysician Assistant (NU)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
John Muir Medical Center - Concord CampusConcord, CAHospital
John Muir Medical Center - Walnut Creek CampusWalnut creek, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
John Muir Physician Network6608789813488

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Ilaria Oliver Mastroserio allows following entities to bill medicare on her behalf.
Entity NameRegents of the University of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760552343
PECOS PAC ID: 4284547274
Enrollment ID: O20031106000389
Entity NameUniversity of California San Francisco
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1861578973
PECOS PAC ID: 4486567229
Enrollment ID: O20031212000897
Entity NameJohn Muir Physician Network
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1841407665
PECOS PAC ID: 6608789813
Enrollment ID: O20031226000143
Entity NameUCSF Medical Group Business Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1477624104
PECOS PAC ID: 3779497870
Enrollment ID: O20040622001513

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Ilaria Oliver Mastroserio is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Ilaria Oliver Mastroserio, PA-C
1450 Treat Blvd Ste 300,
Walnut Creek, CA 94597-2168

Ph: (925) 952-2828		Ilaria Oliver Mastroserio, PA-C
177 La Casa Via Ste 390,
Walnut Creek, CA 94598-6101

Ph: (925) 692-5610

Reviews and Comments


Physician Assistant Nurses in Walnut Creek, CA

Julia Alexa Ondarza, PA-C
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 2637 Shadelands Dr, Walnut Creek, CA 94598
Phone: 925-430-5335    Fax: 925-430-5446
Ali Hussain Mithani, PA-C
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 130 La Casa Via Ste 210, Walnut Creek, CA 94598
Phone: 925-309-5155    
Lora Mina Rancourt, PA-C
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 2625 Shadelands Dr, Walnut Creek, CA 94598
Phone: 925-939-8585    
Haley Nichole Folta, PA-C
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 813-302-8000    
Jennifer Price,
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 1450 Treat Blvd Ste 250b, Walnut Creek, CA 94597
Phone: 925-296-9740    
Mr. James Quintella, PA-C
Physician Assistant
Medicare: Accepting Medicare Assignments
Practice Location: 301 Lennon Ln Ste 100, Walnut Creek, CA 94598
Phone: 925-944-0110    Fax: 925-944-0960
Jodi Reynolds, P.A.
Physician Assistant
Medicare: Medicare Enrolled
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4130    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.