Senior Doc Medical PC

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

Legal business name

SENIOR DOC MEDICAL PC

Practice address

5 Hutton Centre Dr Ste 950
Santa Ana, CA 92707-8744

Phone

(855) 434-7663

Fax

(949) 281-5550

NPI assigned

Apr 14, 2026

Last updated

Apr 14, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

John Geiss, DONPI 1053651497

Title

Ceo

Phone

(714) 702-5145

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• John Mark Geiss, D.O.

  • Family Medicine Physician
  • Santa Ana, CA
  • NPI 1053651497
  Authorized official Same address or phone

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

{
    "created_epoch": "1776124800000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1776124800000",
    "number": "1578407359",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5 HUTTON CENTRE DR STE 950",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927078744",
            "telephone_number": "855-434-7663",
            "fax_number": "949-281-5550"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5 HUTTON CENTRE DR STE 950",
            "city": "SANTA ANA",
            "state": "CA",
            "postal_code": "927078744",
            "telephone_number": "855-434-7663",
            "fax_number": "949-281-5550"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "SENIOR DOC MEDICAL PC",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-04-14",
        "last_updated": "2026-04-14",
        "certification_date": "2026-04-14",
        "status": "A",
        "authorized_official_last_name": "GEISS",
        "authorized_official_first_name": "JOHN",
        "authorized_official_title_or_position": "CEO",
        "authorized_official_telephone_number": "714-702-5145",
        "authorized_official_credential": "DO"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Senior Doc Delaware PA
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• Senior Doc New Jersey PC
• Senior Doc North Carolina PC
• Senior Doc Pennsylvania PC
• Senior Doc Utah PC
• Senior Doc Vermont PC

• Family Medicine Physician in Santa Ana, CA
• Providers in Santa Ana, CA by specialty
• Family Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 14, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.