MAYER GROSSER MD
NPI 1962450908
Internal Medicine in New York, NY
About Mayer Grosser Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAYER GROSSER MD (NPI 1962450908) is an individual internal medicine provider in New York, New York, licensed in New York (153293) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 7
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mayer Grosser Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
7Medicare enrollment records show Mayer Grosser reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Jericho, NY 11753
- Reassigned Medicare billing, New York enrollment
- 413 clinicians in this Medicare group
Port Jervis, NY 12771
- Reassigned Medicare billing, New York enrollment
- 57 clinicians in this Medicare group
Poughkeepsie, NY 12601
- Reassigned Medicare billing, New York enrollment
- 201 clinicians in this Medicare group
Harris, NY 12742
- Reassigned Medicare billing, New York enrollment
- 75 clinicians in this Medicare group
Binghamton, NY 13905
- Reassigned Medicare billing, New York enrollment
- 110 clinicians in this Medicare group
Gloversville, NY 12078
- Reassigned Medicare billing, New York enrollment
- 57 clinicians in this Medicare group
Utica, NY 13502
- Reassigned Medicare billing, New York enrollment
- 657 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10021 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.
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 Mayer Grosser's NPI number?
The NPI number for Mayer Grosser is 1962450908. It was assigned to this individual provider in the NPPES registry on May 4, 2006.
Where is Mayer Grosser located?
Mayer Grosser practices at 100 E 77th St, New York, NY 10021. The listed phone number is (212) 434-2650.
What is Mayer Grosser's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mayer Grosser enrolled in Medicare?
Yes. Mayer Grosser is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mayer Grosser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mayer Grosser reassigns Medicare benefits to 7 organizations: Optum Urgent Care, PLLC (Jericho, NY), Delaware River Medicine, PLLC (Port Jervis, NY), Emergency Physician Services Of New York, P.C. (Poughkeepsie, NY), Sullivan Emergency Services PC (Harris, NY), Exigence Medical Of Binghamton PLLC (Binghamton, NY) and 2 more organizations, listed in the Medicare section above. 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 Mayer Grosser'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 Mayer Grosser was last updated on July 8, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Mayer Grosser, MD · NPI 1962450908
Internal Medicine physician in New York, New York. Individual provider, active in the CMS NPPES registry since May 4, 2006.
## Identity
- **NPI:** 1962450908 (Entity type: Individual)
- **Enumerated:** May 4, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 153293 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 E 77TH ST, New York, NY 10021-1850
- **Phone:** (212) 434-2650 · **Fax:** (212) 434-4512
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Optum Urgent Care, PLLC (NPI 1285975797, Jericho, NY); Delaware River Medicine, PLLC (NPI 1457987521, Port Jervis, NY); Emergency Physician Services Of New York, P.C. (NPI 1093759847, Poughkeepsie, NY); Sullivan Emergency Services PC (NPI 1528338480, Harris, NY); Exigence Medical Of Binghamton PLLC (NPI 1659464758, Binghamton, NY); and 2 more · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 8, 2009
- **Other identifiers:** Medicare PIN 07E3623051 (NY); Medicare PIN 07E362 (NY); Medicaid 01039041 (NY); and 4 more
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Source: [NPI Profile](https://npiprofile.com/npi/1962450908) · Data from the CMS NPPES public registry.