William Tillis, - Medicare Pulmonary Disease in Lake Geneva, WI

William Tillis, is a medicare enrolled "Internal Medicine - Pulmonary Disease" physician in Lake Geneva, Wisconsin. He went to University Of Illinois College Of Med (chi/peor/rock/chm-urb) and graduated in 1986 and has 38 years of diverse experience with area of expertise as Pulmonary Disease. He is a member of the group practice Mercy Health System Corporation and his current practice location is N2950 State Road 67, Lake Geneva, Wisconsin. You can reach out to his office (for appointments etc.) via phone at (262) 245-0535.

William Tillis is licensed to practice in Wisconsin (license number 81911-20) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1669468377.

Contact Information

William Tillis,
N2950 State Road 67,
Lake Geneva, WI 53147-2655
(262) 245-0535
(262) 245-2248



Physician's Profile

Full NameWilliam Tillis
GenderMale
SpecialityPulmonary Disease
Experience38 Years
LocationN2950 State Road 67, Lake Geneva, Wisconsin
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • William Tillis attended and graduated from University Of Illinois College Of Med (chi/peor/rock/chm-urb) in 1986
  NPI Data:
  • NPI Number: 1669468377
  • Provider Enumeration Date: 09/27/2005
  • Last Update Date: 09/14/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 5991765075
  • Enrollment ID: I20230913001846

Medical Identifiers

Medical identifiers for William Tillis such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1669468377NPI-NPPES
036085931MedicaidIL
833307MedicaidSC

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RP1001XInternal Medicine - Pulmonary Disease 83330 (South Carolina)Secondary
207RP1001XInternal Medicine - Pulmonary Disease 81911-20 (Wisconsin)Primary
207RP1001XInternal Medicine - Pulmonary Disease 036085931 (Illinois)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mercy Health System CorpJanesville, WIHospital
Mercy Walworth Hospital & Medical CenterLake geneva, WIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mercy Health System Corporation7416860440459

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Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. William Tillis allows following entities to bill medicare on his behalf.
Entity NameMercy Health System Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1598718603
PECOS PAC ID: 7416860440
Enrollment ID: O20031113000164

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Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. William Tillis is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
William Tillis,
N2950 State Road 67,
Lake Geneva, WI 53147-2655

Ph: (262) 245-0535
William Tillis,
N2950 State Road 67,
Lake Geneva, WI 53147-2655

Ph: (262) 245-0535

News Archive

Deriving lessons from cholera epidemic in Haiti and looking forward to future actions

Noting U.N. peacekeepers played a role in bringing cholera to Haiti, Victoria Fan, a research fellow at the Center for Global Development (CGD), writes in the group's "Global Health Policy" blog, "Blame aside, there are undoubtedly lessons to be learned by looking back at how this epidemic came to pass in Haiti. More importantly, looking ahead there are key steps that should be taken to eliminate cholera in Haiti."

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› Verified 9 days ago


Internal Medicine Doctors in Lake Geneva, WI

Dr. Brian Jay Silverstein, MD
Pulmonary Disease
Medicare: Not Enrolled in Medicare
Practice Location: W3329 Burr Oak Dr, Lake Geneva, WI 53147
Phone: 847-271-9609    
Nadiia Marenych, MD
Pulmonary Disease
Medicare: Accepting Medicare Assignments
Practice Location: 146 E Geneva Sq, Lake Geneva, WI 53147
Phone: 262-249-5000    
Dr. Nestor C Alabarca, MD
Pulmonary Disease
Medicare: Not Enrolled in Medicare
Practice Location: 146 E Geneva Square, Lake Geneva, WI 53147
Phone: 262-249-5000    Fax: 262-249-7142
Dr. Rajesh Balagani, DO
Pulmonary Disease
Medicare: Accepting Medicare Assignments
Practice Location: N2950 State Road 67, Lake Geneva, WI 53147
Phone: 262-245-0535    Fax: 262-245-7865
Dr. Nadia Sergevna Hall, M.D.
Pulmonary Disease
Medicare: Accepting Medicare Assignments
Practice Location: 146 E Geneva Sq, Lake Geneva, WI 53147
Phone: 262-249-5000    
Shashi Bhushan, MD
Pulmonary Disease
Medicare: Accepting Medicare Assignments
Practice Location: 146 E Geneva Sq, Lake Geneva, WI 53147
Phone: 262-549-5000    

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