DR. GARY MAZER M.D.
NPI 1538337381
Emergency Medicine in New York, NY
About Dr. Gary Mazer M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GARY MAZER M.D. (NPI 1538337381) is an individual emergency medicine provider in New York, New York, licensed in New York (236270) and active in the NPI registry since February 2008. He is enrolled in Medicare PECOS and maintains a secondary practice location in White Plains.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Gary Mazer M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Gary Mazer reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10028
- Reassigned Medicare billing, New York enrollment
- 596 clinicians in this Medicare group
Rye Brook, NY 10573
- Reassigned Medicare billing, New York enrollment
- 470 clinicians in this Medicare group
Berkeley Heights, NJ 07922
- Reassigned Medicare billing, New Jersey enrollment
- 1,184 clinicians in this Medicare group
Woodbury, NY 11797
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Huntington Hospital Association
- 116 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 10028 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 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Gary Mazer's NPI number?
The NPI number for Gary Mazer is 1538337381. It was assigned to this individual provider in the NPPES registry on February 14, 2008.
Where is Gary Mazer located?
Gary Mazer practices at 336 E 86th St, New York, NY 10028. The listed phone number is (212) 772-3627.
What is Gary Mazer's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Gary Mazer enrolled in Medicare?
Yes. Gary Mazer is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Gary Mazer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gary Mazer reassigns Medicare benefits to 4 organizations: City Medical Of Upper East Side, PLLC (New York, NY), Westchester Medical Group, P.C. (Rye Brook, NY), Summit Medical Group PA (Berkeley Heights, NJ) and Huntington Hosptial Association (Woodbury, NY). Each 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 Gary Mazer'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 Gary Mazer was last updated on February 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.
# Dr. Gary Mazer, M.D. · NPI 1538337381
Emergency Medicine physician in New York, New York. Individual provider, active in the CMS NPPES registry since February 14, 2008.
## Identity
- **NPI:** 1538337381 (Entity type: Individual)
- **Enumerated:** February 14, 2008
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 236270 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 336 E 86TH ST, New York, NY 10028-4615
- **Phone:** (212) 772-3627
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): City Medical Of Upper East Side, PLLC (NPI 1730491945, New York, NY); Westchester Medical Group, P.C. (NPI 1881653822, Rye Brook, NY); Summit Medical Group PA (NPI 1942254347, Berkeley Heights, NJ); Huntington Hosptial Association (NPI 1902100209, Woodbury, NY) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 21, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1538337381) · Data from the CMS NPPES public registry.