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

Dr. William E Ayetey, MD

Individual provider Psychiatry Physician · NPI 1780604025

Dr. William E Ayetey, MD practises Psychiatry in Janesville, Wisconsin. Graduated from University of Minnesota Medical School in 1991, 35 years ago. Practices with Mercy Health System Corporation, a 751-clinician group, works from 6 locations and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
35
Trained at
University of Minnesota Medical School
Licensed in
IL, WI
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

903 Mineral Point Ave
Janesville, WI 53548-2970
Phone: (608) 756-5555
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (5)

  • 875 S Route 31, Crystal Lake, IL 60014-8190 — (779) 220-5500
  • 1045 W Stephenson St, Freeport, IL 61032-4864 — (815) 741-7652
  • 901 Grant St, Harvard, IL 60033-1821 — (815) 943-5431
  • 8201 E Riverside Blvd, Rockford, IL 61114-2300 — (815) 971-7000
  • 1000 Mineral Point Ave, Janesville, WI 53548-2940 — (608) 756-6761

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 33457 (WI)
Psychiatry Physician Taxonomy 2084P0800X · Licence 036.153566 (IL)

Record details

NPI number1780604025
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 20, 2006
Last updated in NPPESApril 1, 2026
Certification dateApril 1, 2026

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1991 (35 years in practice)
Group practice Mercy Health System Corporation — 751 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients38
Services billed 159 a service is one billed item, such as a visit, a test or a procedure
Average patient age52

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Mercy Health System Corp Hospital · Janesville, WI

Colleagues at Mercy Health System Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 751 clinicians in the practice; 12 are shown here.

Other providers in Janesville