Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Harold F. Curtin III, O.D.
Optometrist in Sudbury, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1346335817
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Registry record
Entity type Individual (Type 1)
Name Dr. Harold F. Curtin III
Credential O.D.
Sex Male
Practice address 435 Boston Post Road, Sudbury, MA, 01776
Phone (978) 443-7121
Fax (978) 443-0893
Enumeration date Oct 3, 2006
Last updated in NPPES Aug 1, 2019
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 |
|---|---|---|---|
| 0352659 | Medicaid | MA | - |
| W15638 | Other | MA | BC/BS OF 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 NPI 1346335817 active?
Yes, as of the latest NPPES snapshot, NPI 1346335817 is active (record last updated 2019-08-01).
How do I verify Harold Curtin's NPI record?
Cross-check NPI 1346335817 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-08-01.