Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Brian E Hallowell, OD
Optometrist in Calais, ME · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1851308977
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Registry record
Entity type Individual (Type 1)
Name Dr. Brian E Hallowell
Credential OD
Sex Male
Practice address 4 Park St, Calais, ME, 04619
Phone (207) 454-2277
Fax (207) 454-2910
Enumeration date Aug 2, 2006
Last updated in NPPES Feb 2, 2010
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 126350000 | Medicaid | ME | - |
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 Brian Hallowell?
Brian Hallowell is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Robert Macmannis Optometrist · Calais, ME NPI 1295742989 Hallowell & Macmannis, O.D., P.A. Optometrist · Calais, ME NPI 1689704025 Carina Orcutt Optometrist · Calais, ME NPI 1407004864 Sunrise Eye Care PA Optometrist · Calais, ME NPI 1366757593 Jennifer Kehrer Optometrist · Calais, ME NPI 1902258361
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-02.