Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alexandra E. S. Thomson, D.M.D

Dentist in Washington, DC · enumerated 2007.

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

National Provider Identifier

1598970394

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexandra E. S. Thomson

Credential D.M.D

Sex Female

Practice address 412 1st St Se, 2nd Floor, Rear Bldg, Washington, DC, 20003

Phone (202) 863-1600

Enumeration date May 14, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 004980 (DC) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential

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

How do I verify Alexandra Thomson's NPI record?

Cross-check NPI 1598970394 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1598970394 active?

Yes, as of the latest NPPES snapshot, NPI 1598970394 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.