Constantine Kulkoff, D.O.

Primary specialty

Adult Medicine PhysicianTaxonomy code 207QA0505X

License

20A19557 Issued in CA

Practice address

1393 Santa Rita Rd Ste F
Pleasanton, CA 94566-5667

Phone

(415) 580-1342

NPI assigned

Mar 26, 2020

Reactivated

Sep 19, 2025

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

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.

• Proactive Work Health Medical Center Inc

  • Multi-Specialty Clinic/Center
  • Los Angeles, CA
  • NPI 1336260421
  NPD (past)

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

{
    "created_epoch": "1585180800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786924800000",
    "number": "1316574452",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1393 SANTA RITA RD STE F",
            "city": "PLEASANTON",
            "state": "CA",
            "postal_code": "945665667",
            "telephone_number": "415-580-1342"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1393 SANTA RITA RD STE F",
            "city": "PLEASANTON",
            "state": "CA",
            "postal_code": "945665667",
            "telephone_number": "415-580-1342"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "21 San Miguel Ave Ste A",
            "address_purpose": "LOCATION",
            "city": "Salinas",
            "state": "CA",
            "postal_code": "939013066",
            "country_code": "US",
            "telephone_number": "831-256-7673",
            "fax_number": "831-800-8582",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "KULKOFF",
        "first_name": "CONSTANTINE",
        "name_prefix": "Dr.",
        "credential": "D.O.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-03-26",
        "last_updated": "2026-08-17",
        "certification_date": "2026-08-17",
        "deactivation_date": "2025-07-29",
        "reactivation_date": "2025-09-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2083X0100X",
            "taxonomy_group": "",
            "desc": "Preventive Medicine, Occupational Medicine",
            "state": "CA",
            "license": "20A19557",
            "primary": false
        },
        {
            "code": "207QA0505X",
            "taxonomy_group": "",
            "desc": "Family Medicine, Adult Medicine",
            "state": "CA",
            "license": "20A19557",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lauren Mersadi Krause
• Sandra Ann Kreizenbeck, NP
• Lindsey Marie Kremmel, PH.D.
• Benjamin Carl Krieg, L.AC.
• Simon Kuang, D.C.
• Aswathi Mohan Kumar, MD
• Krittika Kunda
• Joelle Kupras, M.S.SP
• Kure Ambulatory Surgery Center
• Nicole Emiko Kurtz, PPS

• Adult Medicine Physician in Pleasanton, CA
• Providers in Pleasanton, CA by specialty
• Adult Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 17, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.