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About

Summary: Allergy, Asthma & Sinus Center S.C. is a privately owned medical practice in southeastern Wisconsin, led by board-certified allergists Dr. Gary C. Steven and Dr. Donald A. Bukstein. Founded in 2003 and based in Greenfield, WI, the center provides comprehensive allergy, asthma, and sinus care for children and adults, with services including allergy testing, nitric oxide testing, asthma education, exercise challenges, fiberoptic rhinoscopy, and scuba diving fitness evaluations. They operate at four U.S. locations, including Greenfield (HQ) and Mount Pleasant, and run daily pollen counting to improve community pollen data. The practice emphasizes patient and community support through affiliations like the American Lung Association–Wisconsin. If your search is specifically for Dr. Gary C. Steven in Wausau, note that the primary locations are in southeastern Wisconsin (Greenfield and Mount Pleasant) rather than Wausau.

Clinic Type

Allergy & Asthma

Address

8585 W. Forest Home Ave Suite 200, Greenfield, WI 53228

Phone

+1-414-529-8500

Email

Opening Hours

Not published — contact the clinic to confirm hours.

Telehealth

Virtual visits offered

Services Offered

  • Allergy testing
  • Asthma care
  • Sinus care
  • Virtual visits
  • Office visits
  • Testing ordered during initial consult

Team

  • Dr. Gary C. Steven, Board-certified by the American Board of Allergy and Immunology (ABAI); Fellow of the ACAAI and AAAAI; Certified Physician Investigator (CPI) through ACRP — Physician

Insurance & Payment

Languages Spoken

FAQs

What is the ownership model of the Allergy, Asthma & Sinus Center?

Independent clinic owned by Dr. Gary Steven since February 2003 with no corporate executives or investors; care team focuses on patient care.

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Unilocal: 3 reviews (various) (3)
  • FindATopDoc: 5/5 (3)
  • Yahoo Local: 2.5/5 (multiple)

Patients praise

  • patients who found effective, long-term solutions for chronic conditions
  • praise for thorough evaluations and creative, out-of-the-box treatment planning
  • appreciation for staff friendliness and helpfulness in certain cases
  • some patients value the doctor's up-to-date knowledge on latest medications

Common complaints

  • reports of perceived arrogance and lack of bedside manner
  • concerns regarding high costs and billing practices for testing and follow-ups
  • dissatisfaction with a perceived heavy focus on expensive prescription medications
  • claims of poor office administration and scheduling issues
  • allegations of unprofessional treatment experiences

"Very pompous. Thinks he knows more then everyone else. Wants you in his drug studies. It is his way or the highway."

Vitals review

"Dr. Steven’s care has given me my good health back. He is a great doctor who is up on all the latest medications and treatments... willing to listen to and consider a patient’s ideas and thoughts."

Unilocal review

"They do not care about their patients well being. They just want your money!"

Mukwonago-WI.helpyouachieve.com 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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