Mason Shieh, M.D., M.B.A.

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

A134394 Issued in CA

Practice address

3751 Katella Ave
Los Alamitos, CA 90720-3113

Phone

(714) 456-8888

NPI assigned

Apr 3, 2012

Sex

Male

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Emergency Medicine

Education

University of California, Irvine, California College of Medicine, 2012

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Regents of the University ofGroup PAC ID 7517869605, 126 clinicians

Cep America - CaliforniaGroup PAC ID 6103739131, shared by 2 NPIs, 1,278 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Uci Health-Lakewood Hospital, Lakewood, CA, CCN 050581
• Uci Health-Orange Hospital, Orange, CA, CCN 050348

Merit-based Incentive Payment System (MIPS)

Final score

96.69 of 100Reported as group

Quality

90

Improvement activities

40

Cost

78.43

Medicare enrollment (NPD)

Enrolled

Credentials

Master of Business Administration, 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.

• Regents of the University of

  • Emergency Medicine Physician
  • Orange, CA
  • NPI 1154379394
  Medicare reassignment Care Compare group NPD
• Cep America - California

  • Emergency Medicine Physician
  • San Francisco, CA
  • NPI 1023063542
  Medicare reassignment NPD
• Cep America - California

  • Emergency Medicine Physician
  • Santa Ana, CA
  • NPI 1548667843
  Medicare reassignment NPD
• Cep America - California

  • Emergency Medicine Physician
  • Glendora, CA
  • NPI 1043684764
  NPD
• Cep America - California

  • Emergency Medicine Physician
  • Watsonville, CA
  • NPI 1831587179
  NPD
• Cep America-California

  • Emergency Medicine Physician
  • Murrieta, CA
  • NPI 1588552848
  NPD
• Glass Beach Medical Services a Medical Corporation

  • Emergency Medicine Physician
  • San Ramon, CA
  • NPI 1710336300
  NPD (past)

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

• University of California Irvine

  • General Acute Care Hospital
  • Lakewood, CA
  • NPI 1184655581
  Care Compare affiliation
• University of California Irvine

  • Urgent Care Clinic/Center
  • Irvine, CA
  • NPI 1518739309

  Hospital

  Care Compare affiliation
• University of California Irvine

  • General Acute Care Hospital
  • Orange, CA
  • NPI 1689608150
  Care Compare affiliation

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

{
    "created_epoch": "1333411200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1743552000000",
    "number": "1467718486",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1115 S SUNSET AVE",
            "city": "WEST COVINA",
            "state": "CA",
            "postal_code": "917903940"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3751 KATELLA AVE",
            "city": "LOS ALAMITOS",
            "state": "CA",
            "postal_code": "907203113",
            "telephone_number": "714-456-8888"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1115 S Sunset Ave",
            "address_purpose": "LOCATION",
            "city": "West Covina",
            "state": "CA",
            "postal_code": "917903940",
            "country_code": "US",
            "telephone_number": "626-962-4011",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SHIEH",
        "first_name": "MASON",
        "credential": "M.D., M.B.A.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2012-04-03",
        "last_updated": "2025-04-02",
        "certification_date": "2025-04-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "A134394",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Shattuck Rehabilitation Services
• Jeanette Louise Shattuck, OTR L
• Imad A Shbeeb, MD
• Colleen Sheh, M.S. CCC-SLP
• James Ezra Sheppard, DO
• Karen Kay Shifflett-Collins, MFT
• Constance S. Shih, M.D.
• Margaret Shih, L.AC.
• Richard C Shin, MD
• Jane K. Shintaku

• Emergency Medicine Physician in Los Alamitos, CA
• Providers in Los Alamitos, 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 2, 2025; 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.