Thomas Mason Postlethwait, DDS
Dentist · Dover, DE
Thomas Mason Postlethwait, DDS is a dentist with a practice address in Dover, Delaware, and NPI 1871638668, issued on Feb 20, 2007. Check the license (Delaware GI 0000849, as entered in NPPES) with the Delaware board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Thomas Mason Postlethwait
- Credential
- DDS
- Primary taxonomy
- Dentist 122300000X
- License number
- GI 0000849 DE
Self-reported in NPPES; status is on the state search - Practice location
- 773 South Queen Street, Dover, DE 19904
- Phone
- (302) 674-8283
- Enumerated
- Feb 20, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest dentist records → All 194 in Delaware → Look up another NPI →
Verify Thomas Mason Postlethwait in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Delaware board licenses this profession
Search for license GI 0000849Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Thomas Mason Postlethwait among 194 dentist records in Delaware
Thomas Mason Postlethwait, DDS is one of 194 dentist records with a practice address in Delaware. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 31% of them.
- NPI issued2007 · 31% of these records are older, 43% newer
- In a Medicare fileNo · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 76% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dentist providers in Delaware
There are 194 dentist records in Delaware. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 194 in Delaware → Every provider in Dover → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Anna Aquine Kujaruk, DMDDover, DE 199041770337925
- Sara Bevan, D.M.D.Dover, DE 199041114281490
- Mark Charvat, DDSDover, DE 199041467032565
- John Fontana, D.M.D.Dover, DE 199041336418151
- Thomas Mercer, D.M.D.Dover, DE 199041073687257
- Sean Mercer, D.D.S.Dover, DE 199041609940980
- Thomas Mercer, D.M.D.Dover, DE 199041932273216
- Christopher Nacrelli, DMDDover, DE 199041609984871
Common questions
What is Thomas Mason Postlethwait, DDS's NPI number?
Thomas Mason Postlethwait, DDS's National Provider Identifier (NPI) is 1871638668, issued on Feb 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Mason Postlethwait, DDS located?
The NPPES record lists a practice address at 773 South Queen Street, Dover, DE, 19904. Phone: (302) 674-8283. Providers update this record themselves, so call before visiting.
How can I verify Thomas Mason Postlethwait, DDS's license?
NPPES lists Delaware license number GI 0000849, as entered by the provider. Search the Delaware board that licenses this profession; the NPPES record confirms identity 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. 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.