Leonard Zir, MD
NPI 1275509150 · Cardiovascular Disease Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leonard Zir, MD is a Cardiovascular Disease Physician provider in Cambridge, MA (NPI 1275509150).
Provider details
- NPI number
- 1275509150
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 34331 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-28
- Last updated
- 2011-04-22
Frequently asked questions
- What is Leonard Zir's NPI number?
- Leonard Zir's National Provider Identifier (NPI) is 1275509150, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Zir's specialty?
- Leonard Zir is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Zir located?
- Leonard Zir's practice location on file with NPPES is 300 Mount Auburn St, Cambridge, MA 02138-5600.
- What is Leonard Zir's phone number?
- The practice phone number listed in the NPPES registry for Leonard Zir is (617) 497-1560.
- Does Leonard Zir accept Medicare?
- Leonard Zir is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leonard Zir's NPI active?
- Yes — Leonard Zir's NPI (1275509150) is active in the NPPES registry as of the last update on 2011-04-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.