Helen Seda Thomasian
Dentist · Gaithersburg, MD
Helen Seda Thomasian is a dentist with a practice address in Gaithersburg, Maryland, and NPI 1063635290, issued on Apr 10, 2007. Check the license (Maryland 12074, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Helen Seda Thomasian
- Primary taxonomy
- Dentist 122300000X
- License number
- 12074 MD
Self-reported in NPPES; status is on the state search - Practice location
- 237 Kentlands Blvd, Gaithersburg, MD 20878
- Phone
- (301) 987-5200
- Enumerated
- Apr 10, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (301) 987-5511
- Entity
- Type 1 · individual
Also registered at 237 Kentlands Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patricio Herdoiza, DDSDentist1013030212
- Roxana Homayoun, ORTHODONTISTOrthodontics and Dentofacial Orthopedics Dentistry1578649760
- Ira Reiz, DMDGeneral Practice Dentistry1801230420
- Ali Ziglari, D.D.SGeneral Practice Dentistry1013953512
Verify Helen Seda Thomasian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 12074Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average dentist in 2024
12 Medicare Part D claims, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $650.07
9 payments; by number, the most common kind was food and beverage; the largest payer was Zimvie Inc. The 31,974 providers of this specialty with any payment received $540.36 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
55 dentist records list a practice address in Gaithersburg
They are 55 of the 2,580 NPPES records with a practice address in Gaithersburg, and 1,870 dentist records in Maryland.
All 55 in Gaithersburg → All 1,870 in Maryland → Every provider in Gaithersburg →
Other dentist records in Maryland
- Vargha Abbasian, D.D.S.Elkton, MD1356656854
- Anahita Abdehou, DDSRosedale, MD1902062292
- Ossob Abdillahi, DMDGaithersburg, MD1932237385
- Laylo Abdurahmonova, DDSManchester, MD1861367427
- Thomas Abecket, DDSLaurel, MD1265774087
- Martin Abel, D.D.S.Rockville, MD1285604058
- Shannon Abel, D.D.S.Rockville, MD1326018185
- Ryan Abi Jomaa, DDSOlney, MD1295664613
- Median Abraha, DDSOxon Hill, MD1518642248
- Ampili Abraham, DDSCatonsville, MD1750430005
Common questions
What is Helen Seda Thomasian's NPI number?
Helen Seda Thomasian's National Provider Identifier (NPI) is 1063635290, issued on Apr 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Helen Seda Thomasian located?
The NPPES record lists a practice address at 237 Kentlands Blvd, Gaithersburg, MD, 20878. Phone: (301) 987-5200. Providers update this record themselves, so call before visiting.
How can I verify Helen Seda Thomasian's license?
NPPES lists Maryland license number 12074, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Helen Seda Thomasian prescribe under Medicare Part D?
In 2024, Helen Seda Thomasian had 12 Medicare Part D claims; the average among dentist prescribers was 86. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.