Geoffrey Alan Sigmund, M.D.

Primary specialty

Neuroradiology PhysicianTaxonomy code 2085N0700X

License

A107164 Issued in CA

Practice address

101 The City Dr S
Uci Medical Center, Department of Radiology
Orange, CA 92868-3201

Phone

(714) 456-7890

NPI assigned

Apr 28, 2008

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA, IN2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Diagnostic RadiologyAlso: Interventional Radiology

Education

Loma Linda University School of Medicine, 2007

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Saint Agnes Medical FoundationGroup PAC ID 7618946369, 161 clinicians

Newport Diagnostic Radiology IncGroup PAC ID 3870494388, 9 clinicians

Newport Diagnostic Center IncGroup PAC ID 4587198379, 8 clinicians

Memorialcare Medical FoundationGroup PAC ID 8729277314, 555 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Saint Agnes Medical Center Hospital, Fresno, CA, CCN 050093
• Memorialcare Long Beach Medical Center Hospital, Long Beach, CA, CCN 050485

Merit-based Incentive Payment System (MIPS)

Final score

70 of 100Reported as individual

Quality

40

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gsigmund910312@direct.memorialcare.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.

• Memorialcare Medical Foundation

  • Clinic/Center
  • Fountain Valley, CA
  • NPI 1205167350
  Medicare reassignment Care Compare group NPD
• Newport Diagnostic Center Inc

  • Radiology Clinic/Center
  • Newport Beach, CA
  • NPI 1932117249
  Medicare reassignment Care Compare group NPD
• Newport Diagnostic Radiology, Inc

  • Diagnostic Radiology Physician
  • Newport Beach, CA
  • NPI 1134345473
  Medicare reassignment Care Compare group NPD
• Saint Agnes Medical Foundation

  • Internal Medicine Physician
  • Fresno, CA
  • NPI 1558819482
  Medicare reassignment Care Compare group
• Southern Inyo Healthcare District

  • Critical Access Hospital
  • Lone Pine, CA
  • NPI 1831128602
  Medicare reassignment NPD
• Radiology of Indiana P C

  • Diagnostic Radiology Physician
  • Indianapolis, IN
  • NPI 1992723829

  CA, Neuroradiology

  Medicare reassignment NPD
• Renaissance Imaging Medical Associates, Inc.

  • Diagnostic Radiology Physician
  • Northridge, CA
  • NPI 1487608931
  Medicare reassignment
• Southern Inyo Healthcare District

  • Rural Health Clinic/Center
  • Lone Pine, CA
  • NPI 1063589174
  NPD

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

• Long Beach Memorial Medical

  • General Acute Care Hospital
  • Long Beach, CA
  • NPI 1962442012
  Care Compare affiliation
• Saint Agnes Medical Center

  • General Acute Care Hospital
  • Fresno, CA
  • NPI 1205845567
  Care Compare affiliation

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

{
    "created_epoch": "1209340800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1773792000000",
    "number": "1710152988",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "101 THE CITY DR S",
            "address_2": "UCI MEDICAL CENTER, DEPARTMENT OF RADIOLOGY",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683201",
            "telephone_number": "714-456-7890"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "101 THE CITY DR S",
            "address_2": "UCI MEDICAL CENTER, DEPARTMENT OF RADIOLOGY",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "928683201",
            "telephone_number": "714-456-7890"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1510 E Herndon Ave Ste 110",
            "address_purpose": "LOCATION",
            "city": "Fresno",
            "state": "CA",
            "postal_code": "937203333",
            "country_code": "US",
            "telephone_number": "559-450-6742",
            "fax_number": "559-450-6743",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIGMUND",
        "first_name": "GEOFFREY",
        "middle_name": "ALAN",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2008-04-28",
        "last_updated": "2026-03-18",
        "certification_date": "2026-03-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "CA",
            "license": "A107164",
            "primary": false
        },
        {
            "code": "2085N0700X",
            "taxonomy_group": "",
            "desc": "Radiology, Neuroradiology",
            "state": "CA",
            "license": "A107164",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://memorialcare.org/fhir/api/FHIR/R4/",
            "affiliation": "Y",
            "endpointDescription": "MemorialCare FHIR Endpoint",
            "affiliationName": "MemorialCare Medical Foundation",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "FHIR",
            "address_1": "17360 Brookhurst St",
            "city": "Fountain Valley",
            "state": "CA",
            "country_code": "US",
            "postal_code": "927083720",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Erica A Siepker, BS
• Crystal Sierra
• Jackson Andrew Sierra
• Brooklyn Kate Sievers
• Shahzeen Sarosh Siganporia
• Lorna D. Sikorski, M.A., CCC-SP
• Janeth Araceli Silenski, LVN
• Maricruz Sillas
• Jack Howard Sills, MD
• Arturo Nicolas Silva Suarez, DDS

• Neuroradiology Physician in Orange, CA
• Providers in Orange, CA by specialty
• Neuroradiology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 18, 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.