Internal Medicine | ProHealth Care | Waukesha County, WI
Internal Medicine • Waukesha, WI • Since 1914 • Multiple locations in Waukesha County (Delafield, Muskego, Oconomowoc, Pewaukee, Watertown, Waukesha, etc.) locations
About
ProHealth Care is a nonprofit health system based in Waukesha, Wisconsin (founded 1914). It operates 9 locations in the U.S. (primarily in Waukesha County) and offers a broad range of services including emergency and urgent care, primary and specialty clinics, cancer centers, rehabilitation, occupational health, and pharmacies. The system employs about 1,670 staff and has annual revenue around $240M. Key leadership spans community services, payer contracting/finance, and clinical service lines. For internal medicine in Waukesha County, ProHealth Care provides affiliated primary care roles (e.g., Family Medicine clinics) and supports internal medicine through its network of primary care and specialty clinics across multiple Waukesha locations. Phone lines and headquarters are in Waukesha.
Clinic Type
Internal Medicine
Address
Internal Medicine – ProHealth Medical Group locations throughout Waukesha County, WI
Phone
+1-262-928-3000
CustomerRelationsOnlineInquiry1@phci.org
Opening Hours
Not published — contact the clinic to confirm hours.
Services Offered
Team
Insurance & Payment
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Languages Spoken
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Current Offers
New patient visit (internal medicine)
FAQs
What is internal medicine?
Internal medicine doctors provide primary care for adults 18+. They have deep knowledge of conditions common to adults and manage multiple chronic conditions.
Internal medicine services
Count on your internal medicine doctor for: - Care of illnesses and injuries - Annual physical exams - Immunizations, including flu shots and vaccines that protect against pneumonia - Help managing chronic health conditions - Help managing multiple medical conditions - Healthy lifestyle counseling - Referrals to specialists - Medicare annual wellness visits - Reproductive health care
Social Media
Photos
What Patients Say
Overall sentiment across review platforms: positive
- ProHealth Care Internal Medicine (Provider: Dr. Daniel Cheng): 5 / 5 (609)
- ProHealth Care Internal Medicine (Provider: Dr. Reyhan Demircioglu): 4.9 / 5 (273)
- ProHealth Care Internal Medicine (Provider: Dr. Andrew McGown): 4.9 / 5 (316)
- ProHealth Care Internal Medicine (Provider: Dr. James Chapman): 5 / 5 (345)
- ProHealth Care Internal Medicine (Provider: Dr. Marcus Perry): 4.9 / 5 (284)
- ProHealth Urgent Care Waukesha (Sunset Drive): 4.6 / 5 (260)
Patients praise
- High level of physician professionalism, kindness, and compassion
- Thorough medical evaluations and attentive listening by doctors
- Excellent follow-up care and responsiveness from providers
- Convenient access and efficient appointment processes in some clinics
Common complaints
- Billing disputes and confusion regarding insurance coding
- Perceived lack of communication or unresponsiveness from administrative/billing departments
- Occasional patient reports of feeling rushed during appointments
- Reports of rude staff or unhelpful interactions in non-physician departments
"Dr. Cheng is one of the s [best doctors] I have ever had. He always follows up with info, concerns and remedies."
— ProHealth Care patient review"Dr. Demi is kind, considerate, compassionate - and professional."
— ProHealth Care patient review"Wish I could give less then 1 star for the billing department. They are extremely rude and do not do anything to assist with billing errors."
— Better Business Bureau customer complaintSynthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].
In the News
- Dr. William F. Lutz, MD - Internal Medicine Physician in Waukesha, WI — May 14, 2026
- Dr. Debra A. Muggler, MD - Internal Medicine Physician in Hartland, WI — May 14, 2026
- Dr. Anu Verma, MD - Endocrinologist in Waukesha, WI — May 14, 2026
- Dr. Gilberto Marquez, MD, Internist | Muskego, WI | WebMD — Jan 23, 2026
- Dr. Gilberto Marquez, MD, Internist - Muskego, WI | Sharecare — Jan 25, 2026
Information sourced from the clinic's website as of July 11, 2026.
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