Michael D. Wertheimer, M.D.
Surgical Oncology Physician · Worcester, MA
Michael D. Wertheimer, M.D. is a surgical oncology physician with a practice address in Worcester, Massachusetts, and NPI 1265540975, issued on Aug 25, 2006. Check the license (Massachusetts 34387, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Michael D. Wertheimer
- Credential
- M.D.
- Primary taxonomy
- Surgical Oncology Physician 2086X0206X
- License number
- 34387 MA
Self-reported in NPPES; status is on the state search - Practice location
- Umass Memorial Health Care, Worcester, MA 01605
- Phone
- (508) 334-5132
- Enumerated
- Aug 25, 2006
- Record last updated
- Jul 20, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20041201000993); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 1971
- Entity
- Type 1 · individual
8 nearest surgical oncology physician records → All 61 in Massachusetts → Look up another NPI →
Verify Michael D. Wertheimer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 34387Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Cambridge Public Health CommissionCambridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael D. Wertheimer among 61 surgical oncology physician records in Massachusetts
Michael D. Wertheimer, M.D. is one of 61 surgical oncology physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 66% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1971 · median 2006 among the 43 with a school on file
- Record last updated2015 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086X0206X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgical Oncology Physician providers in Massachusetts
There are 61 surgical oncology physician records in Massachusetts.
All 61 in Massachusetts → Every provider in Worcester → Surgical Oncology Physician nationwide →
The 8 surgical oncology physician records with the nearest ZIP codes
- James Lindberg, MDWorcester, MA 016051326281080
- Ricardo Bello Boccardo, MDWorcester, MA 016551992236020
- Kate Dinh, M.D.Worcester, MA 016551578858445
- David Linshaw, M.D.Worcester, MA 016551518304815
- Monika MasanamWorcester, MA 016551801356266
- Ashley Russo, M.D.Worcester, MA 016551275951816
- Buffi Ward, MDWorcester, MA 016551912076290
- Brian Wolf, M.D.Southbridge, MA 015501316042708
Common questions
What is Michael D. Wertheimer, M.D.'s NPI number?
Michael D. Wertheimer, M.D.'s National Provider Identifier (NPI) is 1265540975, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael D. Wertheimer, M.D. located?
The NPPES record lists a practice address at Umass Memorial Health Care, Worcester, MA, 01605. Phone: (508) 334-5132. Providers update this record themselves, so call before visiting.
How can I verify Michael D. Wertheimer, M.D.'s license?
NPPES lists Massachusetts license number 34387, 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. 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.