Michael D Horwich, MD, PHD

Primary specialty

Dermatology PhysicianTaxonomy code 207N00000X

License

258156 Issued in MA

Practice address

29B Cottage St
Amherst, MA 01002-1206

Phone

(413) 549-7400

Fax

(413) 549-7402

NPI assigned

Jun 30, 2010

Last updated

Jun 12, 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 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

Specialty

Dermatology

Education

University of Massachusetts Medical School, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Pioneer Valley Dermatology PCGroup PAC ID 0244201960, 6 clinicians

Practice addresses (Care Compare)

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Doctor of Philosophy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mhorwich@apderm.emadirect.md

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.

• Pioneer Valley Dermatology PC

  • Dermatology Physician
  • Amherst, MA
  • NPI 1114020211
  Medicare reassignment Care Compare group NPD
• New England Dermatology, P.C.

  • Dermatology Physician
  • Springfield, MA
  • NPI 1356348098
  Medicare reassignment NPD
• PV Bay State LLC

  dba Pioneer Valley Dermatology PC

  • Dermatology Physician
  • Amherst, MA
  • NPI 1700698222
  NPD (past)

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

{
    "created_epoch": "1277856000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1749686400000",
    "number": "1538470976",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "526 MAIN ST STE 302",
            "city": "ACTON",
            "state": "MA",
            "postal_code": "017203301",
            "telephone_number": "978-371-7010",
            "fax_number": "978-371-0522"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "29B COTTAGE ST",
            "city": "AMHERST",
            "state": "MA",
            "postal_code": "010021206",
            "telephone_number": "413-549-7400",
            "fax_number": "413-549-7402"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HORWICH",
        "first_name": "MICHAEL",
        "middle_name": "D",
        "name_prefix": "Dr.",
        "credential": "MD, PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2010-06-30",
        "last_updated": "2025-06-12",
        "certification_date": "2025-06-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207N00000X",
            "taxonomy_group": "",
            "desc": "Dermatology",
            "state": "MA",
            "license": "258156",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lauren Ostroff Holt, LICSW
• Eric Hopkins, LICSW
• Jason James Hopkins
• Heather Hornik, PHD
• Robert Horowitz, MD
• Nicholas Christopher Houle, PHARMD
• George F Howard III, MD
• Jeffrey Beckett Humphrey, D.D.S.
• James G Hunt, D.D.S.
• Lynn Hurst, NP

• Dermatology Physician in Amherst, MA
• Providers in Amherst, MA by specialty
• Dermatology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 12, 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.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.