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Checked Sep 30, 2026

Dr. William Tillis, MD

Pulmonologist in Lake Geneva, WI
40 years in practice NPI 1669468377

Book an appointment

(262) 245-0535
Mercy Health System Corporation
N2950 State Rd, Suite 67
Lake Geneva, WI 53147

About Dr. William Tillis

Dr. William Tillis is a pulmonologist in Lake Geneva, WI with 40 years of experience since medical school. Dr. Tillis is a Doctor of Medicine (MD) who trained at University of Illinois College of Med (Chi/Peor/Rock/CHM-Urb), graduating in 1986.

Dr. Tillis sees patients at Mercy Health System Corporation, N2950 State Rd, Suite 67, Lake Geneva, WI 53147. To make an appointment, call (262) 245-0535. Dr. Tillis is affiliated with Mercy Health System Corp and Mercy Walworth Hospital & Medical Center.

Conditions treated include Asthma, Bronchiectasis, Chronic cough, COPD, Pulmonary embolism.

Conditions treated

Education & board certification

Medical degree (MD)University of Illinois College of Med (Chi/Peor/Rock/CHM-Urb) · Graduated 1986

Locations & hours

LocationAddressPhone
Mercy Health System CorporationN2950 State Rd, Suite 67, Lake Geneva, WI 53147(262) 245-0535
Mercy Health System Corp
Hospital affiliation
1000 Mineral Point Ave, Janesville, WI 53547(608) 756-6161
Mercy Walworth Hospital & Medical Center
Hospital affiliation
N2950 State Road 67, Lake Geneva, WI 53147(262) 245-0535

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Questions about Dr. William Tillis

Is Dr. William Tillis accepting new patients?

Please call Mercy Health System Corporation at (262) 245-0535 to ask whether Dr. William Tillis is taking new patients.

Which hospital is Dr. William Tillis affiliated with?

Dr. William Tillis is affiliated with Mercy Health System Corp, Mercy Walworth Hospital & Medical Center.

Where does Dr. William Tillis see patients?

Mercy Health System Corporation, N2950 State Rd, Suite 67, Lake Geneva, WI 53147.

Does Dr. William Tillis offer telehealth visits?

Telehealth visits are not listed for Dr. William Tillis. Contact the office to ask.

This profile is for information only and is not a referral or medical advice. Always confirm details with the practice before your visit. Details were last checked on Sep 30, 2026. Report incorrect information.