Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Helen Seda Thomasian
Dentist in Gaithersburg, MD · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1063635290
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Registry record
Entity type Individual (Type 1)
Name Helen Seda Thomasian
Sex Female
Practice address 237 Kentlands Blvd, Gaithersburg, MD, 20878
Phone (301) 987-5200
Fax (301) 987-5511
Enumeration date Apr 10, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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
What specialty is Helen Thomasian?
Helen Thomasian is registered in NPPES with the primary taxonomy of Dentist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.