Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Gregory J Faust, M.D.
Specialist in Springfield, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1164417929
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Registry record
Entity type Individual (Type 1)
Name Dr. Gregory J Faust
Credential M.D.
Sex Male
Practice address 3640 Main St, Suite 205, Springfield, MA, 01107
Phone (413) 739-7367
Fax (413) 737-2686
Enumeration date Sep 16, 2005
Last updated in NPPES May 23, 2014
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0115328 | Other | MA | AETNA GROUP NO. |
| 073286 | Other | MA | CONNECTICARE |
| 12304 | Other | MA | HEALTH NEW ENGLAND |
| 150662 | Other | MA | HARVARD PILGRIM |
| 180022615 | Other | MA | RAILROAD MEDICARE |
| 0404677003 | Other | MA | CIGNA |
| 073286 | Other | MA | TUFTS |
| J10344 | Other | MA | MA BLUE SHIELD |
| 010073286MA01 | Other | MA | CONNECTICUT BLUE SHIELD |
| 0804433 | Other | MA | UNITED HEALTH CARE |
| P1503588 | Other | MA | OXFORD HEALTH PLANS |
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.
Frequently asked questions
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Gregory Faust?
Gregory Faust is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-05-23.