Douglas Martin Siegmund, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

95025832 Issued in CA

Practice address

2010 E 1St St Ste 100
Santa Ana, CA 92705-4086

Phone

(714) 556-7246

NPI assigned

Jul 6, 2023

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: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2023

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Coastal Family Medicine IncGroup PAC ID 4587678065, 35 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

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

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: sigmund.douglasnp.p7@direct.nautilus.nextgenshare.com
• Direct secure messaging: douglas.siegmund@78.securemail.prognocis.com

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.

• Bristol Park Medical Group, Inc

  • Family Medicine Physician
  • Costa Mesa, CA
  • NPI 1043266760
  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": "1688601600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1746576000000",
    "number": "1437837879",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2915 N. COTTONWOOD ST. UNIT 18",
            "city": "ORANGE",
            "state": "CA",
            "postal_code": "92865",
            "telephone_number": "714-342-8684"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2010 E 1ST ST STE 100",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927054086",
            "telephone_number": "714-556-7246"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4950 Barranca Pkwy Ste 104",
            "address_purpose": "LOCATION",
            "city": "Irvine",
            "state": "CA",
            "postal_code": "926048644",
            "country_code": "US",
            "telephone_number": "949-857-1248",
            "fax_number": "949-559-1165",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "660 Baker St Ste A102",
            "address_purpose": "LOCATION",
            "city": "Costa Mesa",
            "state": "CA",
            "postal_code": "926264407",
            "country_code": "US",
            "telephone_number": "714-668-2505",
            "fax_number": "714-668-2515",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIEGMUND",
        "first_name": "DOUGLAS",
        "middle_name": "MARTIN",
        "credential": "FNP-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2023-07-06",
        "last_updated": "2025-05-07",
        "certification_date": "2025-05-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "163W00000X",
            "taxonomy_group": "",
            "desc": "Registered Nurse",
            "state": "CA",
            "license": "95128967",
            "primary": false
        },
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "95025832",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Rafael Koe Siaosigarcia
• Noel Siat, MFTI
• Amber Sherrie Sibbett-Robles
• Saif Haq Siddiqi, M.D.
• Pritpal Sidhu
• Sierra Clinical Trials & Research Organization, Inc
• Elizabeth Marie Sierra, LCSW, PPSC
• Lawrence Joseph Sieve III, O.D.
• Brandon S. Sievers, M.D.
• Eliza Delfina Sifuentes

• Family Nurse Practitioner in Santa Ana, CA
• Providers in Santa Ana, CA by specialty
• Family Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 7, 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.