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Clinic Type

Internal Medicine

Address

17000 W North Ave Ste 200e, Brookfield, WI 53005

Phone

(262) 785-7700

Email

careers@ascension.org

Opening Hours

Not published — contact the clinic to confirm hours.

Emergency Care

If you are experiencing a life-threatening emergency, call 911 or go directly to the ER.

Services Offered

  • Internal Medicine
  • Primary Care

Team

  • Gretchen A Cunningham — APNP
  • Sunaina Suwal — APNP
  • Gregory P Spielbauer — MD
  • Thomas A Johnson — MD

Insurance & Payment

—

Languages Spoken

—

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • ProHealth Care (Dr. Max Lehmann): 4.9 / 5 (262 reviews)
  • Healthgrades (Dr. Todd Doenier): 4.9 / 5 (27 reviews)
  • Healthgrades (Dr. Kyle Nelson): 4.5 / 5 (17 reviews)
  • Dr. Mark Grossklaus: 4.5 / 5 (Vitals) to 5/5 (ProHealth) (14 to 213 reviews)
  • ProHealth Care (Dr. Joanne Brooks): 4.9 / 5 (217 reviews)
  • ProHealth Care (Dr. Simon Griesbach): 4.9 / 5 (30 reviews)
  • Healthgrades (Dr. Margo Sherman): 3.4 / 5 (Variable)

Patients praise

  • Physicians are frequently described as knowledgeable, compassionate, and excellent listeners
  • Strong emphasis on personalized, patient-centered care and thorough explanations of medical issues
  • Many patients feel heard, supported, and comfortable with their primary care providers
  • High level of trust and long-term relationships with providers

Common complaints

  • Difficulties with appointment scheduling and long wait times for primary care slots
  • Frustration with systemic clinic policies that prioritize filling schedules over patient flexibility
  • Inconsistent continuity of care when unable to see a preferred physician
  • Occasional reports of rude administrative/scheduling staff

"ProHealth does NOT give their physicians the option to leave appointments open for immediate care. If a patient feels a need to see their primary physician quickly it is impossible..."

— ProHealth Patient Review

"Dr. Nelson takes a lot of time to listen to you and explain everything. He is great!! When other doctors couldn't help me with my cholesterol, he figured out a way to lower it."

— Healthgrades Patient Review

"Finding a doctor who treats you like family is rare, and we are incredibly grateful for the care he has provided throughout the years."

— ProHealth Patient Review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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