Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Karen Loring Frizzell Lewis, OD
Optometrist in Cambridge, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1356414205
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Registry record
Entity type Individual (Type 1)
Name Dr. Karen Loring Frizzell Lewis
Credential OD
Sex Female
Practice address 3 Central Square, Cambridge, MA, 02139
Phone (617) 225-2258
Fax (617) 497-2025
Enumeration date Nov 16, 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 |
|---|---|---|---|
| 11456303 | Other | - | CAQH CREDENTIALING CO |
| AA37222 | Other | MA | HARVARD PILGRIM |
| 494820 | Other | MA | TUFTS HEALTHPLAN |
| 2025036001 | Other | MA | CIGNA |
| 911256 | Other | MA | EYE MED |
| 0707121 | Medicaid | MA | - |
| 5029027 | Other | MA | ATENA |
| W16085 | 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 1356414205 active?
Yes, as of the latest NPPES snapshot, NPI 1356414205 is active (record last updated 2007-07-08).
How do I verify Karen Frizzell Lewis's NPI record?
Cross-check NPI 1356414205 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 2007-07-08.