Cassondra Nigg Majestic, M.D.

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

136050 Issued in CA

Practice address

16200 Sand Canyon Ave
Irvine, CA 92618-3714

Phone

(949) 517-3010

NPI assigned

Jul 29, 2013

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Emergency Medicine

Education

Ohio State University College of Medicine, 2013

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Emergency Physicians of Orange CountyGroup PAC ID 9436692100, 63 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Hoag Memorial Hospital Presbyterian Hospital, Newport Beach, CA, CCN 050224

Merit-based Incentive Payment System (MIPS)

Final score

100 of 100Reported as group

Quality

96.39

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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.

• Emergency Physicians of Orange County

  • Emergency Medicine Physician
  • Newport Beach, CA
  • NPI 1912771569
  Medicare reassignment Care Compare group NPD
• Regents of the University of

  • Emergency Medicine Physician
  • Orange, CA
  • NPI 1154379394
  Medicare reassignment NPD
• Newport Emergency Medical Group Inc

  • Medical Specialty Clinic/Center
  • Newport Beach, CA
  • NPI 1922061779
  Medicare reassignment
• University of California Irvine Medical Center

  • General Acute Care Hospital
  • Orange, CA
  • NPI 1760667513
  NPD (past)

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

• Hoag Memorial Hospital Presbyterian

  • General Acute Care Hospital
  • Newport Beach, CA
  • NPI 1518951300
  Care Compare affiliation

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

{
    "created_epoch": "1375056000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776902400000",
    "number": "1538501705",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "16200 SAND CANYON AVE",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926183714",
            "telephone_number": "949-517-3010"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "16200 SAND CANYON AVE",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926183714",
            "telephone_number": "949-517-3010"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAJESTIC",
        "first_name": "CASSONDRA",
        "middle_name": "NIGG",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2013-07-29",
        "last_updated": "2026-04-23",
        "certification_date": "2026-04-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "136050",
            "primary": true
        },
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Thao Phuong Nguyen Mai, PHARM.D.
• Tiffany Mai, CCC-SLP
• Palesa Haka Maieane
• Jodi Ann Mainwal, RN
• Karen Majdalani, LMFT
• Majid Kashani DDS Inc
• Majid Pahlevan Physical Therapist Inc
• Majidpahlevan Physicaltherapist Inc
• Maulik Dilipkumar Majmudar, M.D.
• Nasiba Makarem, PHARM.D.

• Emergency Medicine Physician in Irvine, CA
• Providers in Irvine, CA by specialty
• Emergency Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 23, 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.