Leonard M. Zir, MD
Cardiovascular Disease Physician · Cambridge, MA
Leonard M. Zir, MD is a cardiovascular disease physician with a practice address in Cambridge, Massachusetts, and NPI 1275509150, issued on Feb 28, 2006. Check the license (Massachusetts 34331, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Leonard M. Zir
- Credential
- MD
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- 34331 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Mount Auburn St, Cambridge, MA 02138
- Phone
- (617) 497-1560
- Enumerated
- Feb 28, 2006
- Record last updated
- Apr 22, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (617) 497-1109
- Medicaid ID
- 6187188 MA
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 1,080 in Massachusetts → Look up another NPI →
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Verify Leonard M. Zir in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 34331Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
30 Medicare Part D claims, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Leonard M. Zir among 1,080 cardiovascular disease physician records in Massachusetts
Leonard M. Zir, MD is one of 1,080 cardiovascular disease 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. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 65% of these records are
- Record last updated2011 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Massachusetts
There are 1,080 cardiovascular disease physician records in Massachusetts.
All 1,080 in Massachusetts → Every provider in Cambridge → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Robert Campbell, M.D.Cambridge, MA 021381982670857
- David Farmer, MDCambridge, MA 021381962454298
- Stephen Gannon, M.D.Cambridge, MA 021381881960037
- Marion Hogan, MDCambridge, MA 021381326005349
- Jeffrey Leavitt, MDCambridge, MA 021381861469785
- Kyle Pond, MDCambridge, MA 021381326090622
- Burton Rabinowitz, MDCambridge, MA 021381184668691
- Fabian Reimold, M.D., PH. D.Cambridge, MA 021381609216571
Common questions
What is Leonard M. Zir, MD's NPI number?
Leonard M. Zir, MD's National Provider Identifier (NPI) is 1275509150, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leonard M. Zir, MD located?
The NPPES record lists a practice address at 300 Mount Auburn St, Cambridge, MA, 02138. Phone: (617) 497-1560. Providers update this record themselves, so call before visiting.
How can I verify Leonard M. Zir, MD's license?
NPPES lists Massachusetts license number 34331, 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.
How much does Leonard M. Zir, MD prescribe under Medicare Part D?
In 2024, Leonard M. Zir, MD had 30 Medicare Part D claims; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions 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. 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.