Nancy V. Gwon, M.D.
Internal Medicine Physician · Boston, MA
Nancy V. Gwon, M.D. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1174645246, issued on Apr 6, 2007. Check the license (Massachusetts 31445, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Nancy V. Gwon
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 31445 MA
Self-reported in NPPES; status is on the state search - Practice location
- 99 High St, Boston, MA 02110
- Phone
- (617) 695-6628
- Enumerated
- Apr 6, 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 internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 99 High St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alice Rogado, M.D.Internal Medicine Physician1720119662
Verify Nancy V. Gwon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 31445Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Nancy V. Gwon among 6,825 internal medicine physician records in Massachusetts
Nancy V. Gwon, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- George Hasiotis, MDBoston, MA 021101386631844
- Alice Rogado, M.D.Boston, MA 021101720119662
- Jill Schiff, M.D.Boston, MA 021101215087259
- Dineli Ahearn, M.D.Boston, MA 021111528015922
- Ethan Balk, M.D.Boston, MA 021111831136571
- Peter Castaldi, M.D.Boston, MA 021111902891062
- Jin Byung Chae, M.D.Boston, MA 021091477713121
- Daniel Chandler, M.D.Boston, MA 021111760440168
Common questions
What is Nancy V. Gwon, M.D.'s NPI number?
Nancy V. Gwon, M.D.'s National Provider Identifier (NPI) is 1174645246, issued on Apr 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy V. Gwon, M.D. located?
The NPPES record lists a practice address at 99 High St, Boston, MA, 02110. Phone: (617) 695-6628. Providers update this record themselves, so call before visiting.
How can I verify Nancy V. Gwon, M.D.'s license?
NPPES lists Massachusetts license number 31445, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.