Ilaria Oliver Mastroserio, PA-C

Primary specialty

Physician AssistantTaxonomy code 363A00000X

Practice address

177 La Casa Via Ste 390
Walnut Creek, CA 94598-6101

Phone

(925) 692-5610

NPI assigned

Jul 25, 2019

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

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

Physician Assistant

Education

Other, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

John Muir Physician NetworkGroup PAC ID 6608789813, 488 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• John Muir Medical Center - Concord Campus Hospital, Concord, CA, CCN 050496
• John Muir Medical Center - Walnut Creek Campus Hospital, Walnut Creek, CA, CCN 050180

Merit-based Incentive Payment System (MIPS)

Final score

100 of 100Reported as group

Quality

95

Improvement activities

40

Cost

80.65

Merit-based Incentive Payment System (MIPS)

Final score

90.32 of 100Reported as group

Quality

89.54

Promoting interoperability

100

Improvement activities

40

Cost

74.34

Medicare enrollment (NPD)

Enrolled

Credentials

Physician Assistant

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: imastroserio171920@ehr.johnmuirhealth.com
• Direct secure messaging: imastroserio63553@direct-ucsfmedicalcenter.org

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.

• John Muir Physician Network

  • General Practice Physician
  • Walnut Creek, CA
  • NPI 1841407665
  Medicare reassignment Care Compare group NPD
• UCSF Medical Group Business Services

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1477624104
  Medicare reassignment NPD
• Regents of the University of California

  • Internal Medicine Physician
  • San Francisco, CA
  • NPI 1760552343
  Medicare reassignment
• University of California San Francisco

  • Pediatrics Physician
  • San Francisco, CA
  • NPI 1861578973
  Medicare reassignment
• University of California San Francisco

  • Community/Retail Pharmacy
  • San Francisco, CA
  • NPI 1659141711
  NPD

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

• John Muir Health

  • General Acute Care Hospital
  • Walnut Creek, CA
  • NPI 1740215219
  Care Compare affiliation
• John Muir Health

  • General Acute Care Hospital
  • Concord, CA
  • NPI 1801821376
  Care Compare affiliation

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

{
    "created_epoch": "1564012800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1716336000000",
    "number": "1376197590",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1450 TREAT BLVD STE 300",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945972168",
            "telephone_number": "925-952-2828"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "177 LA CASA VIA STE 390",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945986101",
            "telephone_number": "925-692-5610"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MASTROSERIO",
        "first_name": "ILARIA",
        "middle_name": "OLIVER",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-07-25",
        "last_updated": "2024-05-22",
        "certification_date": "2024-05-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Douglas R. Mason, MD
• Kelly Ann Mason, M.S., CCC-SLP
• Tina Lee Masoudi, AMFT
• Jason Lee Massa, D.O.
• Natalie Massa
• Michelle Masuda, DDS, MSD
• Mika Elaina Masuda
• Mari Masunaga
• Alana Matayoshi
• Christina Mathieson

• Physician Assistant in Walnut Creek, CA
• Providers in Walnut Creek, CA by specialty
• Physician Assistant in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 22, 2024; 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.