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

Dr. Benjamin Wallbrunn Felder, DO

Individual provider Hospitalist Physician · NPI 1003261041

Dr. Benjamin Wallbrunn Felder, DO practises Internal Medicine in Oceanside, New York. Qualified in 2016, 10 years ago. Practices with Mount Sinai School of Medicine, a 151-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
10
Licensed in
NY
In the registry since
2016
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1 Healthy Way
Oceanside, NY 11572-1551
Phone: (516) 632-3666
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 600 Broadway Ave Nw Apt 307, Grand Rapids, MI 49504-7318 — (520) 440-3152
  • First Avenue At 16th Street, New York, NY 10003 — (212) 844-1808
  • 281 1st Ave, New York, NY 10003-2925 — (212) 844-1808

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 316981 (NY)
Hospitalist Physician Taxonomy 208M00000X · Licence 316981 (NY)

Record details

NPI number1003261041
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedApril 27, 2016
Last updated in NPPESAugust 1, 2023
Certification dateJuly 27, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice Mount Sinai School Of Medicine — 151 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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 patients163
Services billed 371 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $125 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Mount Sinai School of Medicine

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 151 clinicians in the practice; 12 are shown here.

Other providers in Oceanside