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Colorectal,
Gastrointestinal and Liver Care

Michigan Gastroenterology Institute and Capitol Colorectal Surgery

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Who is DHI?           

Digestive Health Institute, also known as Michigan Gastroenterology Institute and Capitol Colorectal Surgery was established in 1998 in central Michigan with the goal of providing exceptional care to patients with digestive health diseases. We strive to give the best comprehensive care to our community in a way that conveys compassion and understanding, and we’ll never compromise the quality of care our patients receive.

Our care providers are simultaneously involved in clinical research and medical education with our higher-education affiliate, Michigan State University. We’re also a proud partner of Pinnacle GI Partners, a unique family of practices focused on innovating gastrointestinal health care practices across the Midwest. Thanks to our partnership, we can give our patients the best providers possible for effective treatment and compassionate care.

Conditions We Treat

Anal/Rectal Abscess

COLON POLYPS

CROHN’S DISEASE

GALLSTONES

HEPATITIS

PILONIDAL DISEASE

BARRETT’S ESOPHAGUS

CIRRHOSIS

GERD

GASTROPORESIS

H PYLORI INFECTION

ULCERATIVE COLITIS

CELIAC DISEASE

COLON CANCER

FATTY LIVER DISEASE

HEMORRHOIDS

PANCREATITIS

Welcome DHI’s New Providers

Daniel P. Geisler, M.D., Colorectal Surgeon

Colorectal Surgeon Daniel Geisler, M.D. specializes in minimally invasive colorectal surgery. He has held positions at Columbia University and Cleveland Clinic.

Jannel Lee-Allen, M.D, Gastroenterologist

Gastroenterologist Jannel Lee-Allen, M.D. previously enjoyed a seven-year career in community and housing development in Detroit until she decided to pursue her passion in medicine.

Grace Langholz, MSPAS, PA-C, Physician Assistant

Physician Assistant Grace Langholz, MSPAS, PA-C is a Lansing native. She is bilingual and holds certifications in advanced cardio life support and basic life support.

Our Doctors

We’re proud of our team here at Digestive Health Institute. Our health care providers include some of the very best colorectal surgeons, gastroenterologists and physician assistants. To learn more about our qualified team of specialists, click their image or visit our providers page.

Iftiker Ahmad, MD

Daniel Coffey, MD

Radoslav Coleski, MD, PhD

Daniel Geisler, MD

Dorian Jones, MD

Lucas Julien, MD

Janell Lee-Allen, MD

Razvan Opreanu, MD

Scott Plaehn, DO, FACOI

Albert Ross, MD

John Walling, Jr., DO, FACOI

Siaka Yusuf, MD

What Our Patients Are Saying

The young man who registered me was excellent. I waited about 45 minutes and could not help but overhear how calmly and professionally he handled multiple complaints by walk-in patients. The complaints were not related to appointments but getting a response to inquiries about other issues. He just took it all in stride and seemed to calm the patient. Dr. Jones also patiently listened to my personal issues with communications with the practice. I appreciate his time and consideration.

Margaret N.

I would like to write a raving review for Sal! Over the years she has been EXTERMLY professional, her dedication to your patients goes above and beyond. She has been truly a pleasure to work with and we will miss her referring to use here at Michigan Medicine. I have often referred to her process and professionalism with many other outside referring offices. She will be missed! You I wish you nothing but the best Sal!!! Suzanne

Suzanne T.

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Staff at reception/checkout were professional & helpful. Medical Assistant was friendly & thorough. Dr. Ahmad was at his best as is the case with every visit. He is thorough, honest, empathetic, and always an excellent communicator/educator.

Kathy D.

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Great experience all-around! Very friendly staff and knowledgeable providers (both physician assistants and doctors) I see lots of people on here who are frustrated with phones and IT-related issues but as this is out of the employee’s hands I base my review off of the things that WERE in their control. They were kind, efficient and understanding.

Jo S.

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From my very first encounter at the front desk, to the discharge nurse after surgery, my experience was a good one. The staff all listened to my questions and concerns, and Dr. Julian is top-notch.

Cynthia S.

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