1. Mark L Medder, DMD

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O'fallon, IL

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Mark L Medder, DMD

5.0 (1 review)
Open • 9:00 am - 3:00 pm

Services - Mark L Medder, DMD

Cavity treatment

Dental exams

Tooth filling replacement or repair

Mark L Medder, DMD Photos

Recommended Reviews - Mark L Medder, DMD

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4 months ago

We adore Dr. Mark! He is kind, caring, and works so well with children. Highly recommend

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Ask the Community - Mark L Medder, DMD

Green Mount Family Dentistry - Front of office, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

Green Mount Family Dentistry

1.9(18 reviews)
1.2 mi

My experience with the front desk was extremely disappointing and unprofessional…read more Ashley repeatedly changed her explanation instead of working toward a solution. First, she said I had not provided my insurance information. Then she said I had provided the wrong information. I had already provided all of the necessary insurance information, including a copy of the front and back of my medical insurance card. The confusion appeared to be that my medical and dental coverage are administered by different insurance companies, even though they use the same Member ID and Group Number. Once Ashley allowed me to explain the situation, I clarified that the insurance company had already confirmed their protocol: the provider's office simply needs to call the provider services 1-800 number to verify coverage and obtain any needed information. Despite this, Ashley repeatedly refused to make the call and instead told me, "You do it," more than once. Throughout the interaction, Ashley raised her voice, accused me of interrupting her, and shifted blame rather than trying to resolve the issue. She also refused to provide her last name when I requested it. Ashley initially told me the manager was present while we were speaking. However, when I asked to speak with the manager, she then said the manager was in a meeting. These inconsistent statements caused me to question the accuracy of the information I was being given. Ashley also stated that Alex the manager approved of how she handled the situation. Throughout the interaction, I perceived multiple microaggressions and felt I was not treated with professionalism or respect. Patients should not have to argue with staff to have standard insurance verification procedures followed. I hope management reviews this interaction, provides additional customer service training, and ensures staff follow established insurance verification protocols instead of placing the burden on patients when the insurer has instructed the provider's office to make the verification call.

Ok. When i first started w this practice, ALL was well. No complaints but clearly things have…read moregotten progressively worse. Especially w BILLING. They need a new office manager and someone who knows WTH he or she is doing because they will send u a bill without allowing your insurance to pay their part and trust me...if they send you one, DO NOT PAY IT. WAIT until insurance has done their part as their billing practices are terrible and questionable and suspect. Thank me later. Trash the first bill. Will take an act of Congress to get anything back from them. Which is pretty bad and why i shall never return.

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Green Mount Family Dentistry - Front of office, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

Front of office, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

Green Mount Family Dentistry - Front of office, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

Front of office, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

Green Mount Family Dentistry - Office plaza,  Green Mount Family Dentistry. Dentist in O'Fallon, IL.

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Office plaza, Green Mount Family Dentistry. Dentist in O'Fallon, IL.

John Rottschalk Dental Group

John Rottschalk Dental Group

3.8(13 reviews)
3.3 mi

I ended up coming to this office after my awesome dentist retired. My wife chose it based on online…read morereviews. Dr. R. struck me as a bit of an oddball when I first met him--almost overly cheerful. Over time, though, that demeanor seemed to fade. I never felt like my dental needs were truly being addressed; it often felt more like my teeth were being prepped for future repairs. Then came a visit where he told me I needed a root canal on a healthy tooth. At the time, I didn't question his opinion, but I had my doubts. My understanding is that root canals are typically necessary when a tooth is significantly compromised. At my most recent visit, a molar cracked, and I immediately had that sinking feeling: "root canal." I was right. When I told him I wasn't on board, he simply stood there tapping his foot, waiting for me to give in. I told him I would be seeking a second opinion--and that's exactly what I did. My new dentist confirmed that a root canal was not necessary, as the tooth was still healthy. Unfortunately, that experience caused me to lose all trust.

Never again! They accepted my dental insurance which is one of the best then years later claimed…read morethe insurance company had and audit and said I was not covered at the time, even though I was and the dentist's office will not even set an appointment unless they first verify your insurance coverage. Then tried to send me a bill for it!! AVOID THEM!!

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John Rottschalk Dental Group - Untitled

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John Rottschalk Dental Group - Untitled

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John Rottschalk Dental Group - Untitled

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Dipali Thakker, DMD - Shiloh Dental Group - Same-Day Crown Process

Dipali Thakker, DMD - Shiloh Dental Group

3.4(5 reviews)
1.0 mi

I pondered whether I should write this review or not. Fortunately, I didn't have to make the…read moredecision as it was made for me. About 7 months or so ago I went in for a cleaning and much to my dismay I was told I had 5 cavities. In the first 30 years of my life I had none, but now I have five. That should have been my first indicator. About a week after my first round of cavities being filled the exact spot of one cavity became extremely sensitive to cold or heat so I go back in. Her explanation, my gum has receded some so that was causing the sensitivity on the top of my tooth in the exact spot she filled my cavity. Right, so she puts something on the exposed part of my tooth to help and within 2 days it had all fallen off. Several weeks later I went in to have the remaining 3 cavities filled, only I was told they were filling 2 cavities. After I paid and was about to walk out the tech come rushing out informing me they hadn't filled one of the cavities and wanted to know if I wanted to come back in and start the process all over again. I think not. So by this point, I've decided that I will never set foot in this place again. Now, a full 6 months after my last treatment I get a bill in the mail saying I have an unpaid balance that is over 90 days due. First, I paid my balance in full after my last appointment so why do I all of a sudden have an unpaid balance. Second, how is this the first letter I got concerning this. This insinuates that I've got at least 2 other letters and have not bothered to pay up. I had thought this place was suspect early on but this was just the straw that broke the camel's back. On Tuesday I'm going to go in on my lunch break, pay my past due balance and walk out of that place and never go back. I hope that if anyone is looking for a dentist reads this and avoids this place like the plague. If you are looking for quality dentistry work and a professional experience, please look elsewhere.

I give the Thakker Dental Group a five star rating. Dr. Dipa is the best…read moredentist I have ever had. Her office is inviting, her staff is polite and knowledgeable, and the laid-back atmosphere makes it a very pleasant experience. Her equipment is modern, and the doctor's gentle but professional demeanor only adds to the comfort of the office. If you have had fears about going to the dentist, the Thakker group will keep this in mind and display compassion and understanding. The prices are reasonable, and there are specials sometimes offered. Please make this place your next dentist appointment!!!! Julie Gonzales Edwardsvillle

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Dipali Thakker, DMD - Shiloh Dental Group - Same-Day Crown Process

Same-Day Crown Process

Dipali Thakker, DMD - Shiloh Dental Group
Dipali Thakker, DMD - Shiloh Dental Group

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Mark L Medder, DMD - generaldentistry - Updated October 2026

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