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

Dr. William T Marshall, DO

Individual provider Surgery Physician · NPI 1174533061

Dr. William T Marshall, DO is registered under General Practice in Valhalla, New York. Graduated from New York College of Osteo Medicine of New York Institute of Technology in 1999, 27 years ago. Practices with Bristol Hospital Multi Specialty Group, Inc, a 156-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Connecticut and New York.

Years since qualifying
27
Trained at
New York College of Osteo Medicine of New York Institute of Technology
Licensed in
CT, NY
In the registry since
2006
Specialties on file
3
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

100 Woods Rd # A
Valhalla, NY 10595
Phone: (914) 493-7000
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 (2)

  • 1000 Asylum Ave, Hartford, CT 06105-1770 — (860) 714-5237
  • 1000 Asylum Ave, Hartford, CT 06105-1770 — (860) 714-5237

Specialties & licences

Surgical Critical Care Physician (primary) Taxonomy 2086S0102X · Licence 296662 (NY)
Surgery Physician Taxonomy 208600000X · Licence 044420 (CT)
Specialist Taxonomy 174400000X · Licence 044420 (CT)

Record details

NPI number1174533061
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 9, 2006
Last updated in NPPESJanuary 24, 2019

Medicare enrollment

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

Medicare specialtyGENERAL PRACTICE
Medical schoolNEW YORK COLLEGE OF OSTEO MEDICINE OF NEW YORK INSTITUTE OF TECHNOLOGY
Graduated 1999 (27 years in practice)
Group practice Bristol Hospital Multi Specialty Group, Inc. — 156 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Melanoma (skin cancer) excision 22 times · 76th percentile
Removal of tissue 17 times · 67th percentile
Colonoscopy 1–10 times
Hernia repair (minimally invasive) 1–10 times
Pacemaker insertion or repair 1–10 times
Removal of skin lesions 1–10 times
Removal or shaving of skin growth 1–10 times
Skin biopsy 1–10 times
Spinal fusion 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients158
Services billed 424 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

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 $486 10 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.

Colleagues at Bristol Hospital Multi Specialty Group, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 156 clinicians in the practice; 12 are shown here.

Other providers in Valhalla