Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Synthesis Medical Specialties, P.C.

Geriatric Medicine (Internal Medicine) Physician in Fenton, MI · enumerated 2007 · authorized official Matthew Weiss, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1558557983

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Registry record

Entity type Organization (Type 2)

Legal business name Synthesis Medical Specialties, P.C.

Practice address 1 Chateaux Du Lac, Fenton, MI, 48430

Phone (810) 603-3702

Fax (810) 603-3704

Enumeration date Sep 19, 2007

Last updated in NPPES Mar 17, 2023

Taxonomy & classification

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License JN010488 (MI) Secondary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MW007703 (MI) Primary

Authorized official

Name Matthew Weiss

Title Owner

Phone (810) 603-3702

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-03-17. Verify at npiregistry.cms.hhs.gov.

Where is Synthesis Medical Specialties, P.C. located?

The practice location on file with NPPES is in Fenton, MI.

Providers at this address

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Matthew Weiss Geriatric Medicine (Internal Medicine) Physician · Fenton, MI NPI 1982712717

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-17.