Michael Zaslow, M.D.
Internal Medicine Physician · Winchester, MA
Michael Zaslow, M.D. is an internal medicine physician with a practice address in Winchester, Massachusetts, and NPI 1588662985, issued on Jul 9, 2005. Check the license (Massachusetts 48969, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Michael Zaslow
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 48969 MA
Self-reported in NPPES; status is on the state search - Practice location
- 955 Main Street, Winchester, MA 01890
- Phone
- (781) 729-8070
- Enumerated
- Jul 9, 2005
- Entity
- Type 1 · individual
Also registered at 955 Main Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mark Ayanian, MDPediatrics Physician1457385544
- William Breckwoldt, M.D.Specialist1306814272
- Judith Smith, O.T.Occupational Therapist1891921011
Verify Michael Zaslow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 48969Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
24% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,106 Medicare Part D claims for 138 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Atorvastatin Calcium234 claims
- Lisinopril160 claims
- Amlodipine Besylate84 claims
- Metoprolol Succinate73 claims
- Furosemide70 claims
- Lovastatin68 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.
21 internal medicine physician records list a Winchester practice address
They are 21 of the 439 NPPES records with a Winchester practice address, and 7,865 internal medicine physician records in Massachusetts.
All 21 in Winchester → All 7,865 in Massachusetts → Every provider in Winchester →
Other internal medicine physician records in Massachusetts
- Nawal Aamir, MDWorcester, MA1588248926
- Zainab AbbasWorcester, MA1609028000
- Nooshin Abbasi, MD MPHNewton, MA1831888353
- Lauren Abbate, MDBoston, MA1922099621
- Bassima Abdallah, MDBoston, MA1912327305
- Samah Abdallah, MDBrighton, MA1730814971
- Omar Abdel-Wahab, M.D.Boston, MA1023042777
- Salah Abdelgadir, MDBoston, MA1891280954
- Mahmoud Abdelghany, M.D.Springfield, MA1134479629
- Mohab AbdelhalimBoston, MA1871388496
Common questions
What is Michael Zaslow, M.D.'s NPI number?
Michael Zaslow, M.D.'s National Provider Identifier (NPI) is 1588662985, issued on Jul 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Michael Zaslow, M.D. located?
The NPPES record lists a practice address at 955 Main Street, Winchester, MA, 01890. Phone: (781) 729-8070. Providers update this record themselves, so call before visiting.
How can I verify Michael Zaslow, M.D.'s license?
NPPES lists Massachusetts license number 48969, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael Zaslow, M.D. prescribe under Medicare Part D?
In 2024, Michael Zaslow, M.D. had 2,106 Medicare Part D claims for 138 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.