Ari Katz, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

036146174 Issued in IL

Practice address

1535 Treat Blvd
Walnut Creek, CA 94598-1043

Phone

(925) 296-9228

Fax

(925) 296-9227

NPI assigned

Mar 28, 2015

Last updated

Dec 8, 2025By the provider in NPPES

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: No
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Interoperability endpoints

• Direct secure messaging: ari.katz@280633451872260.direct.elationemr.com

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.

• Barry Rotman MD Inc

  • Internal Medicine Physician
  • Walnut Creek, CA
  • NPI 1639388135
  NPD (past)

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

{
    "created_epoch": "1427500800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765152000000",
    "number": "1902290828",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1535 TREAT BLVD",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945981043",
            "telephone_number": "925-296-9228",
            "fax_number": "925-296-9227"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1535 TREAT BLVD",
            "city": "WALNUT CREEK",
            "state": "CA",
            "postal_code": "945981043",
            "telephone_number": "925-296-9228",
            "fax_number": "925-296-9227"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "KATZ",
        "first_name": "ARI",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-03-28",
        "last_updated": "2025-12-08",
        "certification_date": "2025-12-08",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036146174",
            "primary": true
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "IL",
            "license": "036146174",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Fazlollah Behzad Kasravi, M.D.
• Mary Ann Kassier, LCSW
• Julie Anne Beckerman Kasten
• Mary Philomena Kastner, PMHNP
• Gisha Kattady, M.D.
• Deborah Anne Katz, MA,MFT
• Gerald Frank Katz, M.D.
• Michael P. Katz, MD
• Sheila Katz
• Lori Ellen Katzburg, LCSW

• Internal Medicine Physician in Walnut Creek, CA
• Providers in Walnut Creek, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 8, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.