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

Dr. William Clark Decker, DO

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1942205208

Dr. William Clark Decker, DO is registered under Pulmonary Disease in Adrian, Michigan. Graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1985, 41 years ago. Practices with Promedica Central Corporation of Michigan, a 112-clinician group and accepts Medicare assignment. Licensed in Michigan and Ohio.

Years since qualifying
41
Trained at
Des Moines University of Osteopathic Medicine and Health Sciences
Licensed in
MI, OH
In the registry since
2005
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

777 Kimole Ln Ste 100
Adrian, MI 49221-1400
Phone: (517) 265-3411
Fax: (517) 263-7694
Show map & directions

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

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence 5101009355 (MI)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 5101009355 (MI)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 34.008398 (OH)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 34.008398 (OH)

Record details

NPI number1942205208
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 14, 2005
Last updated in NPPESNovember 3, 2023
Certification dateMarch 23, 2020

Medicare enrollment

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

Medicare specialtyPULMONARY DISEASE
Also practisesCRITICAL CARE (INTENSIVISTS)
Medical schoolDES MOINES UNIVERSITY OF OSTEOPATHIC MEDICINE AND HEALTH SCIENCES
Graduated 1985 (41 years in practice)
Group practice Promedica Central Corporation Of Michigan — 112 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 patients516
Services billed 1,738 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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 $1,557 97 payments · a meal or drink at a meeting or visit, not a fee
Education $23 2 payments · 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.

  • Promedica Toledo Hospital Hospital · Toledo, OH · listed as Toledo Hospital
  • Promedica Charles And Virginia Hickman Hospital Hospital · Adrian, MI
  • Promedica Monroe Regional Hospital Hospital · Monroe, MI
  • Elara Caring Home health agency · Jackson, MI

Colleagues at Promedica Central Corporation of Michigan

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 112 clinicians in the practice; 12 are shown here.