Frequently Asked Questions

Below are listed a few of our most frequently asked questions. Click on the question to display or hide the answer.

Office Information

Where is your office located?

We have two locations:

  • Belleville, Illinois
    2900 Frank Scott Parkway West
    Suite 914
    Belleville, IL 62223

  • South St. Louis County
    12818 Tesson Ferry Rd
    Suite 205
    St. Louis, MO 63128

What are your office hours?

Our office hours allow for flexible scheduling with appointments as early as 8:30AM and evening hours until 6PM. We value your time and strive to keep delays to a minimum. Please arrive early if possible in case administrative changes are necessary. Your first visit may take up to 1-2 hours depending upon need for testing.

May I register ahead of time?

Yes, adult and pediatric registration forms are available on the Registration Forms page under Services.

Which Insurance plans do you accept?

Aetna/EPO Aetna/Managed Choice Aetna/PPO (Open Choice) Beech Street/Capp Care BCBS/Alliance Choice BCBS/Alliance PPO BCBS/Alliance Preferred CCN PPO (Medview) Choice Care (Humana) Cigna HMO or PPO Essence (Missouri and Illinois) First Health PPO GHP Access GHP Advantra GHP CMR GHP Sensicare GHP Gold Advantage (HMO) Healthcare USA Healthlink HMO/PPO Medicare Mercy (except MC Plus,Medicare Plus) One Health Plan HMO/PPO/or POS PHCS Open Access PHCS PPO Proamerica Railroad Medicare UHC Choice UHC Select Plus HMO UHC Choice Plus UHC POS UHC Gencare PPO UHC Medicare Complete UHC Options PPO UHC Select EPO UHC Select HMO UHC Select Plus EPO


Do you treat both children and adults?

Yes. Our specialty training in Allergy and Immunology gives us expertise in treating both children and adults with allergic and respiratory disease.

At what age do you start seeing children?

As soon as symptoms present themselves. Asthma can start soon after birth in some children and is usually well underway by the 5th birthday. Allergic diseases including food allergy may also start in infancy. Nasal and ocular allergies often start later and continue into adulthood.

What do I need to do to prepare myself for a first time visit in your office? How long does the visit take?

Initial visits include a thorough review of the present and past history of your condition. Bringing notes or a diary that detail the history and sequence of events is helpful. Records of previous medication use and results can also help in the treatment decision process. For testing, we ask that you remain off antihistamine containing medication 1 week prior to the visit. We schedule 1-2 hours for the initial visit. Depending on the need for testing, some visits will last the full 2 hours.

What method of skin testing do you use? Is it painful? Will it be done at the first visit?

Using up to date easily placed applicators, we can test for a variety of allergens. Small amounts of allergen solutions are placed on the back. Within 15 minutes we can tell you to which allergens you may be sensitive. Allergens available include pollens, mold, dust mites, animal dander and various foods. If necessary, venom skin tests will reveal sensitivity to insects. This is the most accurate test available. A short video demonstrating skin can be viewed by following by clicking Skin Test Video. The applicators will feel somewhat prickly during the second or two that it takes to apply. Often the skin testing is performed at the first visit and the results are incorporated into your treatment plan.

How long a waiting period do you have before there is an available appointment for a new patient?

Often we can schedule a new patient within a week or two. During busy seasons, the wait might extend to several weeks.


Do I have to be referred by my physician?

Although we do not require a referral, a few insurance plans require that you obtain a referral from your primary care provider before seeing a specialist.

Is Dr. Johnson board certified?

Yes. Dr. Johnson is board certified in Allergy and Immunology.