Thomas Bergan Irwin, D.O.
Internal Medicine Physician · Dalton, MA
Thomas Bergan Irwin, D.O. is an internal medicine physician with a practice address in Dalton, Massachusetts, and NPI 1083711378, issued on Sep 20, 2006. Check the license (Massachusetts 230602, 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
- Thomas Bergan Irwin
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 230602 MA
Self-reported in NPPES; status is on the state search - Practice location
- 33 North St, Dalton, MA 01226
- Phone
- (413) 528-8580
- Enumerated
- Sep 20, 2006
- Record last updated
- Jan 5, 2018 (not updated in 8 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 33 North St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Burnham, MDInternal Medicine Physician1467548875
- Thomas Vaughan, MDInternal Medicine Physician1730275140
- Leslie Washburn, NPFamily Nurse Practitioner1053365205
Verify Thomas Bergan Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230602Check 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 Bergan Irwin among 6,825 internal medicine physician records in Massachusetts
Thomas Bergan Irwin, D.O. 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2018 · 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).
3 internal medicine physician records list a practice address in Dalton
They are 3 of the 36 NPPES records with a practice address in Dalton, 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 Dalton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Burnham, MDDalton, MA 012261467548875
- Thomas Vaughan, MDDalton, MA 012261730275140
- Brian BurkeGreat Barrington, MA 012301376672519
- Eric Bush, MDGt Barrington, MA 012301801987151
- William Demarco, DOGreat Barrington, MA 012301124103577
- John Dubois, M.D.Gt Barrington, MA 012301861642563
- Mani George, MDGt Barrington, MA 012301497843650
- Alan Inglis, MDGreat Barrington, MA 012301801840889
Common questions
What is Thomas Bergan Irwin, D.O.'s NPI number?
Thomas Bergan Irwin, D.O.'s National Provider Identifier (NPI) is 1083711378, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Bergan Irwin, D.O. located?
The NPPES record lists a practice address at 33 North St, Dalton, MA, 01226. Phone: (413) 528-8580. Providers update this record themselves, so call before visiting.
How can I verify Thomas Bergan Irwin, D.O.'s license?
NPPES lists Massachusetts license number 230602, 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.