Ellen Dayon, MD

Primary specialty

Geriatric Medicine (Internal Medicine) PhysicianTaxonomy code 207RG0300X

License

A53403 Issued in CA

Practice address

1661 Golden Rain Rd
Seal Beach, CA 90740-4907

Phone

(562) 493-9581

NPI assigned

Mar 23, 2006

Last updated

Nov 15, 2025By the provider in NPPES

Sex

Female

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

Internal Medicine

Education

Other, 1982

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Healthcare Partners Affiliates Medical GroupGroup PAC ID 7315842002, 775 clinicians

Centers for Family Medicine GPGroup PAC ID 9931143799, 87 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Sincerity Hospice Services, Inc Hospice, Anaheim, CA, CCN B31532
• Friendly Hospice Care, Inc. Hospice, Anaheim, CA, CCN D61521
• Uci Health-Orange Hospital, Orange, CA, CCN 050348

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: edayon194788@westdirect.optum.com
• Direct secure messaging: ellen.dayon.p33@direct.monarchhealthcare.nextgenshare.com

All facility ownership & control disclosures 1

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

Owned or controlled facilities with NPI records 1

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

• Sincerity Hospice Services, Inc

  • Community Based Hospice Care Agency
  • Anaheim, CA
  • NPI 1811453871

  Contracted Managing Employee

  CMS ownership

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.

• Centers for Family Medicine GP

  dba Optumcare Medical Group

  • Family Medicine Physician
  • Los Alamitos, CA
  • NPI 1467598243
  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Memorial Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Phoenix, AZ
  • NPI 1255523643
  NPD (past)

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

• Friendly Hospice Care, Inc.

  • Hospice Registered Nurse
  • Brea, CA
  • NPI 1780258913
  Care Compare affiliation
• Sincerity Hospice Services, Inc

  • Community Based Hospice Care Agency
  • Anaheim, CA
  • NPI 1811453871
  Care Compare affiliation
• University of California Irvine

  dba University of California Irvine - Cac Urgent Care

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

  Hospital

  Care Compare affiliation
• University of California Irvine

  dba Uci Health

  • 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": "1143072000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1763164800000",
    "number": "1043279359",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35380",
            "city": "LAS VEGAS",
            "state": "NV",
            "postal_code": "891335380",
            "telephone_number": "702-579-3203"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1661 GOLDEN RAIN RD",
            "city": "SEAL BEACH",
            "state": "CA",
            "postal_code": "907404907",
            "telephone_number": "562-493-9581"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DAYON",
        "first_name": "ELLEN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-03-23",
        "last_updated": "2025-11-15",
        "certification_date": "2025-11-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Geriatric Medicine",
            "state": "CA",
            "license": "A53403",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nora Darwish, BCBA
• Melissa Dassanayake, LCSW
• David Richter, M.D., Inc.
• David Vigil Chiropractic Inc
• Richard Alan Davis
• Hannah Avanthi De Silva, OTR/L
• Michael Anthony Delfin
• Janice Derderian-Harbin, LCSW
• Linh Sylvie Diep
• Christine Doan

• Geriatric Medicine (Internal Medicine) Physician in Seal Beach, CA
• Providers in Seal Beach, CA by specialty
• Geriatric Medicine (Internal Medicine) Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 15, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; facility enrollments, owners and changes of ownership; Provider of Services certification data; 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.