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

William Mazalewski, DO

Individual provider Emergency Medicine Physician · NPI 1841652948

William Mazalewski, DO is registered under Pulmonary Disease in Sarasota, Florida. Graduated from Lake Erie College of Osteopathic Medicine, Erie in 2016, 10 years ago. Practices with Smh Physician Services Inc, a 774-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Florida and Louisiana.

Years since qualifying
10
Trained at
Lake Erie College of Osteopathic Medicine, Erie
Licensed in
FL, LA
In the registry since
2016
Specialties on file
4
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

1921 Waldemere St Ste 705
Sarasota, FL 34239-2913
Phone: (941) 366-5864
Fax: (941) 316-9819
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 200 Healthcare Way Unit 102, North Venice, FL 34275-3670 — (941) 366-5864
  • 2600 Laurel Rd E, North Venice, FL 34275-3226 — (941) 917-9000
  • 1700 S Tamiami Trl, Sarasota, FL 34239-3555 — (941) 917-9000

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence OS15007 (FL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 312508 (LA)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence OS15007 (FL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1841652948
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 28, 2016
Last updated in NPPESMay 12, 2022
Certification dateMay 12, 2022

Medicare enrollment

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

Medicare specialtyPULMONARY DISEASE
Also practisesCRITICAL CARE (INTENSIVISTS)
Medical schoolLAKE ERIE COLLEGE OF OSTEOPATHIC MEDICINE, ERIE
Graduated 2016 (10 years in practice)
Group practice Smh Physician Services Inc — 774 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations6 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 patients1,016
Services billed 1,996 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 $1,239 42 payments · a meal or drink at a meeting or visit, not a fee
Education $90 1 payment · educational material or training, 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 Smh Physician Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 774 clinicians in the practice; 12 are shown here.

Other providers in Sarasota