NPIMap

Individual provider Active NPI

William C McMaster, M.D.

  • Orthopaedic Surgery Physician
  • Orange, CA
National Provider Identifier
1336175058
Registry record updated Mar 3, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Orthopaedic Surgery PhysicianTaxonomy code 207X00000X
License
G20323 Issued in CA
Practice address
1310 W Stewart Dr
Suite 508
Orange, CA 92868-3854
Phone
(714) 633-2111
Fax
(714) 633-5615
NPI assigned
Jun 24, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 3, 2025

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Specialist 174400000X
Orthopaedic Surgery Physician 207X00000X G20323 CA Primary

Addresses

Primary practice location

1310 W Stewart Dr
Suite 508
Orange, CA 92868-3854

Mailing address

1310 W Stewart Dr
Suite 508
Orange, CA 92868-3854
Phone (714) 633-2111

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20120224000148 CA Practitioner - Orthopedic Surgery 7315973781 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Orthopedic Surgery
Education
Clvlnd Clinic Lerner College of Med of Case WSTN RSV University, 1966
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Regents of the University of CaliforniaGroup PAC ID 4486550183, 48 clinicians

Practice addresses (Care Compare)

101 The City Dr S
Orange, CA 92868-3201
Phone (714) 456-7004

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
100 of 100Reported as apm
Quality
83.7
Promoting interoperability
100
Improvement activities
40

Procedures performed for Medicare patients

ProcedureNumber of procedures
Hip replacement1-10
Knee replacement1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine, Doctor of Philosophy

Practice roles

OrganizationSpecialtyStatusNew patients
Regents of the University of California Orthopaedic Surgery CurrentSince Jul 18, 2015 Accepting new patients
St Joseph Hospital of Orange Past Accepting new patients
University of California Irvine Past Accepting new patients
St. Joseph Hospital Specialist Past Accepting new patients
University of California Irvine Past Accepting new patients
Children's Hospital of Orange County Past Accepting new patients

Locations

101 The City Dr S
Orange, CA 92868
Phone (714) 456-6054

101 The City Dr S
Bldg 29
Orange, CA 92868
Phone (714) 456-7005

Organizations & group practices 6

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.

Hospital & facility affiliations 2

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

NPI Registry JSON

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

{
    "created_epoch": "1151107200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1740960000000",
    "number": "1336175058",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1310 W STEWART DR",
            "address_2": "SUITE 508",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683854",
            "telephone_number": "714-633-2111"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1310 W STEWART DR",
            "address_2": "SUITE 508",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683854",
            "telephone_number": "714-633-2111",
            "fax_number": "714-633-5615"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MCMASTER",
        "first_name": "WILLIAM",
        "middle_name": "C",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-24",
        "last_updated": "2025-03-03",
        "certification_date": "2025-03-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "174400000X",
            "taxonomy_group": "",
            "desc": "Specialist",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "CA",
            "license": "G20323",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Orange, CA

Sources for this page

Verify at the official NPI Registry.