DR. JANET M WILLIAMS M.D.
NPI 1144263070
Emergency Medicine in Greece, NY
About Dr. Janet M Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JANET M WILLIAMS M.D. (NPI 1144263070) is an individual emergency medicine provider in Greece, New York, licensed in New York (226659-1) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS, is affiliated with Rochester General Hospital, and is a graduate of State University Of New York At Buffalo School Of Medicine (1991).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Janet M Williams M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Janet Williams reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rochester, NY 14626
- Reassigned Medicare billing, New York enrollment
- 2,285 clinicians in this Medicare group
Rochester, NY 14612
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Western New York Medical Practice PC
- 1,030 clinicians in this Medicare group
Rochester, NY 14627
- Reassigned Medicare billing, New York enrollment
- 1,624 clinicians in this Medicare group
Rochester, NY 14623
- Reassigned Medicare billing, New York enrollment
- 112 clinicians in this Medicare group
Naples, FL 34104
- Reassigned Medicare billing, Florida enrollment
- 6 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
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Rochester General Hospital
Acute Care Hospitals · Rochester, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14626 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
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 Janet Williams's NPI number?
The NPI number for Janet Williams is 1144263070. It was assigned to this individual provider in the NPPES registry on June 14, 2006.
Where is Janet Williams located?
Janet Williams practices at 2745 W. Ridge Road, Greece, NY 14626. The listed phone number is (585) 225-5252.
What is Janet Williams's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Janet Williams enrolled in Medicare?
Yes. Janet Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Janet Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Janet Williams reassigns Medicare benefits to 5 organizations: Rochester General Hospital (Rochester, NY), Western New York Medical Practice P.C (Rochester, NY), University Of Rochester (Rochester, NY), University Of Rochester Urgent Care (Rochester, NY) and Urgent Care Of Naples PA (Naples, FL). 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 Janet Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Janet Williams accept?
Health plans from Anthem Blue Cross and Blue Shield list Janet Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Janet Williams affiliated with any hospitals?
According to CMS data, Janet Williams is affiliated with Rochester General Hospital.
When was this NPI record last updated?
The NPPES record for Janet Williams was last updated on March 29, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Dr. Janet M Williams, M.D. · NPI 1144263070
Emergency Medicine physician in Greece, New York. Individual provider, active in the CMS NPPES registry since June 14, 2006.
## Identity
- **NPI:** 1144263070 (Entity type: Individual)
- **Enumerated:** June 14, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 226659-1 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2745 W. RIDGE ROAD, Greece, NY 14626-3038
- **Phone:** (585) 225-5252 · **Fax:** (512) 280-1446
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Rochester General Hospital (NPI 1356412712, Rochester, NY); Western New York Medical Practice P.C (NPI 1154834877, Rochester, NY); University Of Rochester (NPI 1548583305, Rochester, NY); University Of Rochester Urgent Care (NPI 1700260395, Rochester, NY); Urgent Care Of Naples PA (NPI 1821320730, Naples, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Buffalo School Of Medicine, class of 1991
## Record status
- **NPPES last updated:** March 29, 2010
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Source: [NPI Profile](https://npiprofile.com/npi/1144263070) · Data from the CMS NPPES public registry.