HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / KS

WILLIAM T DIERENFELDT, MD

GASTROENTEROLOGY

Medical school: UNIVERSITY OF MISSOURI, KANSAS CITY, SCHOOL OF MEDICINE

Graduated: 1994

NPI: 1477591634

Practice Locations (4)

COTTON-O'NEIL CLINIC REVOCABLE TRUST

1325 RESEARCH PARK DR

MANHATTAN, KS 665025000

7852708723

COTTON-O'NEIL CLINIC REVOCABLE TRUST

1823 COLLEGE AVE

MANHATTAN, KS 665023381

7853549591

COTTON-O'NEIL CLINIC REVOCABLE TRUST

1500 SW 10H AVE

TOPEKA, KS 666041301

7853546000

COTTON-O'NEIL CLINIC REVOCABLE TRUST

901 SW GARFIELD AVE

TOPEKA, KS 666061670

7853549591

Source: CMS National Downloadable File, September 2026.

WILLIAM DIERENFELDT, MD | HealthCareAtlasUSA