Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor
Theodor Thomas Herwig, MD
Family Medicine Physician in Brewster, MA · enumerated 2006 · practices at Theodor T. Herwig, M.D., P.C..
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1821076688
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Registry record
Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 718001 | Other | MA | TUFTS |
| 01-00760 | Other | MA | UNITED HEALTHCARE |
| 9713531 | Medicaid | MA | - |
| 7783 | Other | MA | HARVARD PILGRIM |
| B10032101 | Other | MA | CIGNA |
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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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.