Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Robert Michael Tieri, OD
Optometrist in Acton, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1427038835
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Registry record
Entity type Individual (Type 1)
Name Robert Michael Tieri
Credential OD
Sex Male
Practice address 465 Great Rd, Acton, MA, 01720
Phone (978) 266-0017
Fax (978) 263-5700
Enumeration date Jan 20, 2006
Last updated in NPPES Jul 8, 2007
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 |
|---|---|---|---|
| W201575 | Other | - | CIGNA |
| 0347299 | Medicaid | MA | - |
| 39879 | Other | - | DAVIS VISION |
| 152084 | Other | MA | HARVARD PILGRIM |
| 702894 | Other | MA | TUFTS |
| 1007735 | Other | - | AETNA |
| 1007735 | Other | - | US HEALTHCARE |
| W15588 | Other | MA | BLUE CROSS |
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 1427038835 active?
Yes, as of the latest NPPES snapshot, NPI 1427038835 is active (record last updated 2007-07-08).
How do I verify Robert Tieri's NPI record?
Cross-check NPI 1427038835 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.