Health & Medical · Internist
William Riesen, MD
Mason City, Iowa
Contact Information
Address1000 4th Street Southwest, Mason City, Iowa, 50401
Phone(641) 428-5700
Websitemercyone.org/provider/william-riesen-md-internal-medicine
View on map →About William Riesen, MD
We are MercyOne: a connected system of health care facilities and services dedicated to helping you live your best life. Our compassionate team delivers high-quality, patient-centered care, advanced treatments, and trusted support to improve the health and well-being of every community we serve.
Business Hours
| Sunday | Closed |
|---|---|
| Monday | 08:00am – 05:00pm |
| Tuesday | 08:00am – 05:00pm |
| Wednesday | 08:00am – 05:00pm |
| Thursday | 08:00am – 05:00pm |
| Friday | 08:00am – 05:00pm |
| Saturday | Closed |