Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mary K Letwin, DVM

Veterinarian in North Andover, MA · enumerated 2013.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1699018697

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary K Letwin

Credential DVM

Sex Female

Practice address 247 Chickering Rd, North Andover, MA, 01845

Phone (978) 682-9905

Enumeration date Mar 28, 2013

Last updated in NPPES Mar 28, 2013

Taxonomy & licenses

174M00000X Veterinarian Other Service Providers · License 2949 (MA) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1699018697 active?

Yes, as of the latest NPPES snapshot, NPI 1699018697 is active (record last updated 2013-03-28).

How do I verify Mary Letwin's NPI record?

Cross-check NPI 1699018697 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-28.