LEONARD M. ZIR MD
NPI 1275509150
Internal Medicine - Cardiovascular Disease in Cambridge, MA
About Leonard M. Zir Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEONARD M. ZIR MD (NPI 1275509150) is an individual cardiovascular disease provider in Cambridge, Massachusetts, licensed in Massachusetts (34331) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 5
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Leonard M. Zir Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Leonard Zir reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Cambridge, MA 02138
- Reassigned Medicare billing, Massachusetts enrollment
- 13 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02138 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CAMBRIDGE, MA 02138
CAMBRIDGE, MA 02138
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Leonard Zir's NPI number?
The NPI number for Leonard Zir is 1275509150. It was assigned to this individual provider in the NPPES registry on February 28, 2006.
Where is Leonard Zir located?
Leonard Zir practices at 300 Mount Auburn St Suite 310, Cambridge, MA 02138. The listed phone number is (617) 497-1560.
What is Leonard Zir's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Leonard Zir enrolled in Medicare?
Yes. Leonard Zir is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Leonard Zir's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leonard Zir reassigns Medicare benefits to Macro, Inc. (Cambridge, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Leonard Zir's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Leonard Zir was last updated on April 22, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Leonard M. Zir, MD · NPI 1275509150
Cardiovascular Disease physician in Cambridge, Massachusetts. Individual provider, active in the CMS NPPES registry since February 28, 2006.
## Identity
- **NPI:** 1275509150 (Entity type: Individual)
- **Enumerated:** February 28, 2006
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 34331 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 MOUNT AUBURN ST, SUITE 310, Cambridge, MA 02138-5600
- **Phone:** (617) 497-1560 · **Fax:** (617) 497-1109
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for durable medical equipment, power mobility devices
- **Bills Medicare through:** Macro, Inc. (NPI 1942251335, Cambridge, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 22, 2011
- **Other identifiers:** Medicare UPIN A35315 (MA); Other B32105 (MA); Medicaid 6187188 (MA); and 2 more
---
Source: [NPI Profile](https://npiprofile.com/npi/1275509150) · Data from the CMS NPPES public registry.