Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Denis J Blais, MD
Specialist in South Weymouth, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1245229335
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Registry record
Entity type Individual (Type 1)
Name Dr. Denis J Blais
Credential MD
Sex Male
Practice address 780 Main St, South Weymouth, MA, 02190
Phone (781) 331-4600
Fax (781) 337-5095
Enumeration date Oct 20, 2005
Last updated in NPPES Apr 12, 2010
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 |
|---|---|---|---|
| 059081 | Other | MA | TUFTS |
| 0001666001 | Other | MA | CIGNA |
| 0011777 | Other | MA | NEIGHBORHOOD HEALTH PLAN |
| 1900035 | Other | MA | UNITED HEALTHCARE |
| 27748 | Other | MA | HARVARD PILGRIM |
| 34742 | Other | MA | FALLON |
| 4487896 | Other | MA | US HEALTHCARE |
| 9718672 | Medicaid | MA | - |
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 Denis Blais?
Denis Blais 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 2010-04-12.