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

Stuart Horowitz, DO

Individual provider Family Medicine Physician · NPI 1972661155

Stuart Horowitz, DO is registered under Family Practice in Massapequa, New York. Graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1977, 49 years ago. Practices with Ronald C Fagan MD PC, a 4-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
49
Trained at
Des Moines University of Osteopathic Medicine and Health Sciences
Licensed in
NY
In the registry since
2006
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.

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Practice location Address checks out

99 Grand Ave
Massapequa, NY 11758-1203 Not confirmed with CMS for 18 years — call before visiting
Phone: (516) 541-9700
Fax: (516) 798-1086
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 134589 (NY)

Record details

NPI number1972661155
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedDecember 4, 2006
Last updated in NPPESMay 16, 2008

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolDES MOINES UNIVERSITY OF OSTEOPATHIC MEDICINE AND HEALTH SCIENCES
Graduated 1977 (49 years in practice)
Group practice Ronald C Fagan Md Pc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients459
Services billed 22,282 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 $1,970 95 payments · 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.

  • Catholic Home Care Home health agency · Farmingdale, NY
  • North Shore Home Care Chha Home health agency · Westbury, NY

Colleagues at Ronald C Fagan MD PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4 clinicians in the practice; 2 are shown here.

Other providers in Massapequa