Robert C Day, M.D.

Primary specialty

Maternal & Fetal Medicine PhysicianTaxonomy code 207VM0101X

License

A139689 Issued in CA

Practice address

16305 Sand Canyon Ave Ste 225
Irvine, CA 92618-3795

Phone

(949) 763-7451

NPI assigned

Mar 31, 2014

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

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

Obstetrics/Gynecology

Education

University of Massachusetts Medical School, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Hoag ClinicGroup PAC ID 3274872064, 447 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

87.51 of 100Reported as group

Quality

84.12

Promoting interoperability

100

Improvement activities

40

Cost

74.24

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/10944/brand/3/csg/1/fhir/r4
• FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/

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.

• Hoag Clinic

  • Primary Care Clinic/Center
  • Newport Beach, CA
  • NPI 1942799523
  Medicare reassignment Care Compare group NPD
• Regents of the University of California

  • Obstetrics & Gynecology Physician
  • Orange, CA
  • NPI 1356304034
  Medicare reassignment NPD
• University of California Irvine

  • Federally Qualified Health Center (FQHC)
  • Anaheim, CA
  • NPI 1598790529
  Medicare reassignment NPD
• UC Irvine Health Cancer Center, Newport Pacific Medical Center

  • Infusion Therapy Clinic/Center
  • Costa Mesa, CA
  • NPI 1558783696
  NPD
• University of California Irvine

  • Pharmacy
  • Irvine, CA
  • NPI 1669344339
  NPD
• Hoag Memorial Hospital Presbyterian

  • General Acute Care Hospital
  • Newport Beach, CA
  • NPI 1518951300
  NPD (past)
• Long Beach Memorial Medical

  • Rehabilitation Hospital Unit
  • Long Beach, CA
  • NPI 1396791414
  NPD (past)
• Long Beach Memorial Medical

  • Children's Hospital
  • Long Beach, CA
  • NPI 1477596583
  NPD (past)
• Saddleback Memorial Medical Center

  • Rehabilitation Hospital Unit
  • Laguna Hills, CA
  • NPI 1114967114
  NPD (past)
• University of California Irvine

  • General Acute Care Hospital
  • Orange, CA
  • NPI 1689608150
  NPD (past)

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

{
    "created_epoch": "1396224000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1750118400000",
    "number": "1841618634",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "395 CENTRAL ST",
            "city": "MILFORD",
            "state": "MA",
            "postal_code": "017573401"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "16305 SAND CANYON AVE STE 225",
            "city": "IRVINE",
            "state": "CA",
            "postal_code": "926183795",
            "telephone_number": "949-763-7451"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "700 Lawrence Expy",
            "address_purpose": "LOCATION",
            "city": "Santa Clara",
            "state": "CA",
            "postal_code": "950515173",
            "country_code": "US",
            "telephone_number": "408-851-1000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "DAY",
        "first_name": "ROBERT",
        "middle_name": "C",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2014-03-31",
        "last_updated": "2025-06-17",
        "certification_date": "2025-06-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "CA",
            "license": "A139689",
            "primary": false
        },
        {
            "code": "207VM0101X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology, Maternal & Fetal Medicine",
            "state": "CA",
            "license": "A139689",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Maternal & Fetal Medicine Physician in Irvine, CA
• Providers in Irvine, CA by specialty
• Maternal & Fetal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 17, 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.