Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

William Fonfeder

Individual provider Legal Medicine · NPI 1568534964

William Fonfeder practises Internal Medicine in Brooklyn, New York. Qualified in 1981, 45 years ago. Practices with Ahava Medical and Rehabilitation Center, LLC, a 150-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
45
Licensed in
NY
In the registry since
2006
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Practice location Address checks out

1472 53rd St
Brooklyn, NY 11219-3948 Not confirmed with CMS for 19 years — call before visiting
Phone: (718) 438-2309
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Legal Medicine (primary) Taxonomy 173000000X · Licence 188439 (NY)

Record details

NPI number1568534964
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedNovember 14, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesPEDIATRIC MEDICINE
Medical schoolOTHER
Graduated 1981 (45 years in practice)
Group practice Ahava Medical And Rehabilitation Center, Llc — 150 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients25
Services billed 49 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Ahava Medical and Rehabilitation Center, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 150 clinicians in the practice; 12 are shown here.

Other providers in Brooklyn