Howard Douglas Klein, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

027988 Issued in CT

Practice address

421 N Main St
Northampton, MA 01060-5302

Phone

(413) 584-4040

NPI assigned

Jun 16, 2006

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 MA

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

State licenses

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

{
    "created_epoch": "1150416000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1063456325",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "421 N MAIN ST",
            "city": "NORTHAMPTON",
            "state": "MA",
            "postal_code": "010605302",
            "telephone_number": "413-584-4040"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "421 N MAIN ST",
            "city": "NORTHAMPTON",
            "state": "MA",
            "postal_code": "010605302",
            "telephone_number": "413-584-4040"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "KLEIN",
        "first_name": "HOWARD",
        "middle_name": "DOUGLAS",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-16",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CT",
            "license": "027988",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• James B. Kirchhoffer, MD
• Sarah Kiritsis, LICSW
• Emily Kitsock
• Henry McKinnell Klatz
• Fay Klein
• Geri Ann Kleinman, DMD
• Leo Kleint
• Katherine Marie Klemer, D.C.
• Teresa I Klich-Nowak, M.D.
• Elana Klugman, M.S.W.

• Internal Medicine Physician in Northampton, MA
• Providers in Northampton, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.