Dr. Christopher Grant Chapman, MD

Dr. Chapman practices at Rush University Medical Center in Chicago, Illinois, part of Rush System for Health.

Dr. Chapman's NPI, 1235378043, was assigned on February 18, 2009. Dr. Chapman graduated from The Johns Hopkins University School of Medicine in 2008. Dr. Chapman holds Illinois license 036128100.

Dr. Chapman's primary practice is Rush University Medical Center, at 1653 West Congress Parkway, Chicago, IL 60612 in Cook County. The practice phone is (312) 942-5000.

Dr. Chapman's primary practice is Rush University Medical Center in Chicago, Illinois, part of Rush System for Health. Dr. Chapman is also affiliated with University of Chicago Medical Center. The medical group on file is Rush University Internists. Dmand AI also links Dr. Chapman to 1 more hospital and 4 medical groups, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chapman practices, 3 sites in all. Vendor and product names are available with a free account.

Gastroenterology is Dr. Chapman's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chapman is board certified in gastroenterology by the American Board of Internal Medicine. Dmand AI has Dr. Chapman's licenses on file in 3 states: Illinois, Ohio and Indiana.

Dmand AI lists acid reflux, colonoscopy, gastrointestinal bleeding, pancreas or bile duct endoscopy (ERCP) and upper GI endoscopy among the conditions Dr. Chapman treats.

CMS data shows 318 Medicare services from Dr. Chapman across 11 procedure codes in 2024, for 172 Medicare patients. Medicare paid $37,376 for them.

CMS counts 172 Medicare patients who saw Dr. Chapman in 2024. The largest group is 65 to 74, with 80 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 24% are also on Medicaid. Their average risk score is 2.06, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Chapman's median patient age at 68, with 54% women.

In 2024, Dr. Chapman wrote 97 Medicare Part D claims for 70 patients. 79% of them were for generic drugs. CMS names the drug for 82 of them, across 4 drugs with 11 or more claims each, at $1,922 in total drug cost. In 2023, CMS named 23 claims across 1 drug.

Dr. Chapman accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chapman as offering telehealth. CMS counts 297 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Chapman, more than 95% of the clinicians it reports for that procedure.

Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)

Dmand AI links 64 papers to Dr. Chapman, published from 2011 to 2025. 2016 was the busiest year, with 8. The most frequent topics are Endosonography, Colorectal Neoplasms and Endoscopic Mucosal Resection. Dr. Chapman has published most often in Gastrointest Endosc. Dr. Chapman's most frequent co-authors are Irving Waxman, MD, Uzma D. Siddiqui and Vani J Albertson Konda, MD.

Dmand AI links Dr. Chapman to 2 clinical trials. Conditions studied include Hypertension, Pancreatitis, Acute Necrotizing and Diabetes Mellitus, Type 2.

CMS Open Payments shows 775 general payments to Dr. Chapman from 21 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 60% of the total. Boston Scientific Corporation paid the most, $263,885. It also lists 3 research payments totaling $8,650 from 2022 to 2024.

Dr. Chapman graduated from The Johns Hopkins University School of Medicine in 2008.

Dr. Chapman is in network with 19 carriers, including Elevance, Aetna and HCSC. HMO plans come from the most carriers, 10. Check the plan with the practice before a visit.