Justin Edward Grenet, MD

Primary specialty

Hematology & Oncology PhysicianTaxonomy code 207RH0003X

License

A209369 Issued in CA

Practice address

3555 Round Barn Cir
Santa Rosa, CA 95403-1757

Phone

(707) 528-1050

Fax

(707) 525-3874

NPI assigned

Apr 8, 2020

Sex

Male

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 OR

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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

{
    "created_epoch": "1586304000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782777600000",
    "number": "1770102915",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3555 ROUND BARN CIR",
            "city": "SANTA ROSA",
            "state": "CA",
            "postal_code": "954031757",
            "telephone_number": "707-528-1050",
            "fax_number": "707-525-3874"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3555 ROUND BARN CIR",
            "city": "SANTA ROSA",
            "state": "CA",
            "postal_code": "954031757",
            "telephone_number": "707-528-1050",
            "fax_number": "707-525-3874"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GRENET",
        "first_name": "JUSTIN",
        "middle_name": "EDWARD",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-04-08",
        "last_updated": "2026-06-30",
        "certification_date": "2026-06-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "CA",
            "license": "A209369",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Heather Marie Greer, MA, MFTI
• Greg Mlynarczyk DDS., Inc
• Edward Jean Gregoire Jr., MD
• Courtney Marie Gregory, RN, IBCLC
• Kurt Eugene Gregory, P.T.A.
• Elise Mary Gressmann-Weaver, LMFT
• Melodese Grey-Mahoney, R.D.
• Kevin Grierson, DPM
• George Edward Griese, RRT
• Dylan Grieve

• Hematology & Oncology Physician in Santa Rosa, CA
• Providers in Santa Rosa, CA by specialty
• Hematology & Oncology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 2026; 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.