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DR. GREGORY JAMES ZIMMER MD
NPI 1174594329
Emergency Medicine in Rochester, NY

Active since January 27, 2006PECOS Enrolled
601 ELMWOOD AVE, ROCHESTER, NY 14642(585) 341-3015 Get Directions Write a Review

NPPES record last updated: April 28, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Gregory James Zimmer Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY JAMES ZIMMER MD (NPI 1174594329) is an individual emergency medicine provider in Rochester, New York, licensed in New York (273986) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1174594329
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. GREGORY JAMES ZIMMERCredential: MD
Location Address601 ELMWOOD AVERochester, NY 14642-0001
Mailing Address601 Elmwood Ave, Box 655-aRochester, NY 14642-8655 · (585) 341-3015
Phone(585) 341-3015
Sole ProprietorNo
Enumeration DateJanuary 27, 2006
Last NPPES UpdateApril 28, 2023
✔ NPI 1174594329 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in NY · 273986
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedGeneral PracticeTaxonomy 208D00000X · License 01054421A (IN)
601 ELMWOOD AVE, Rochester, NY 14642
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Other Identifiers 1

Medicaid03924018NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gregory James Zimmer Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Gregory Zimmer reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Emergency Associates - University Of Rochester
Same address
Emergency Care
601 ELMWOOD AVE, BOX 655
Rochester, NY 14642
  • Reassigned Medicare billing, New York enrollment
  • 197 clinicians in this Medicare group
NPI 1346281268 (585) 341-3015
Observation Associates Of The University Of Rochester
Same address
Multi-Specialty
601 ELMWOOD AVE
Rochester, NY 14642
  • Reassigned Medicare billing, New York enrollment
  • 124 clinicians in this Medicare group
NPI 1518908433 (585) 758-7650
University Of Rochester
Same address
General Acute Care Hospital
601 ELMWOOD AVE, BOX 684
Rochester, NY 14642
  • Reassigned Medicare billing, New York enrollment
  • 1,624 clinicians in this Medicare group
NPI 1346285657 (585) 275-2100
University Of Rochester Urgent Care
2.8 mi
Urgent Care
1300 JEFFERSON RD, SUITE 100
Rochester, NY 14623
  • Reassigned Medicare billing, New York enrollment
  • 112 clinicians in this Medicare group
NPI 1700260395 (585) 413-1800

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
193 services187 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
86 services83 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
24 services24 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
16 services16 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 14642 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$84.93 typical visit price
range $54.87 – $166.88
Typical copayment $21.23 (range $13.71 – $41.72)
Most-billed visit code 99203
Established Patient
$97.08 typical visit price
range $17.54 – $136.14
Typical copayment $24.27 (range $4.38 – $34.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

CARIE E BRADT RPA-C
Physician Assistant
601 ELMWOOD AVE
ROCHESTER, NY 14642
Monroe County (585) 275-6070
DR. RITA DADIZ DO
Pediatrics (Neonatal-Perinatal Medicine)
601 ELMWOOD AVE, BOX 635
ROCHESTER, NY 14642
Monroe County (585) 275-7787
DR. SCOTT ROSS SCHIFFMAN M.D.
Radiology (Diagnostic Radiology)
601 ELMWOOD AVE, BOX 648
ROCHESTER, NY 14642
Monroe County (585) 275-1128
SARAH ANNE ROSSI FNP
Nurse Practitioner (Family)
601 ELMWOOD AVE, BOX 652
ROCHESTER, NY 14642
Monroe County (585) 279-5100
JIMENA CUBILLOS MD
Urology (Pediatric Urology)
601 ELMWOOD AVE, BOX 656
ROCHESTER, NY 14642
Monroe County (585) 275-3342
MRS. ANNE SCHERBERGER KEEFER RN NP
Nurse Practitioner (Adult Health)
601 ELMWOOD AVE, BOX 704
ROCHESTER, NY 14642
Monroe County (585) 275-5307
SCOTT OVERHOLT DDS
Student in an Organized Health Care Education/Training Program
601 ELMWOOD AVE, BOX 705
ROCHESTER, NY 14642
Monroe County (585) 275-7978
MS. SARAH L AVERILL MD
Radiology (Diagnostic Radiology)
601 ELMWOOD AVE
ROCHESTER, NY 14642
Monroe County (585) 275-2100

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 Gregory Zimmer's NPI number?

The NPI number for Gregory Zimmer is 1174594329. It was assigned to this individual provider in the NPPES registry on January 27, 2006.

Where is Gregory Zimmer located?

Gregory Zimmer practices at 601 Elmwood Ave, Rochester, NY 14642. The listed phone number is (585) 341-3015.

What is Gregory Zimmer's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Gregory Zimmer enrolled in Medicare?

Yes. Gregory Zimmer is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Gregory Zimmer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Zimmer reassigns Medicare benefits to 4 organizations: Emergency Associates - University Of Rochester (Rochester, NY), Observation Associates Of The University Of Rochester (Rochester, NY), University Of Rochester (Rochester, NY) and University Of Rochester Urgent Care (Rochester, 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 Gregory Zimmer'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 Gregory Zimmer was last updated on April 28, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.