Dr. William C. Chapman Jr., MD

Dr. Chapman practices at Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health.

Dr. Chapman's NPI, 1003297177, was assigned on June 15, 2015. Dr. Chapman graduated from Georgetown University School of Medicine in 2015. Dr. Chapman holds Missouri license 2017007784.

Dr. Chapman's primary practice is Barnes-Jewish Hospital, at One Barnes-Jewish Hospital Plaza, Saint Louis, MO 63110 in St. Louis City. The practice phone is (314) 747-3000. Dr. Chapman also practices at Barnes-Jewish Hospital, 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110.

Dr. Chapman's primary practice is Barnes-Jewish Hospital in Saint Louis, Missouri, part of BJC Health. Dr. Chapman is also affiliated with Missouri Baptist Medical Center. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Chapman to 1 more hospital and 1 group practice or clinic, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chapman practices, 4 sites in all. Vendor and product names are available with a free account.

Colon and rectal surgery is Dr. Chapman's primary specialty in the NPI Registry, under taxonomy code 208C00000X. Dr. Chapman is licensed in Missouri.

CMS data shows 93 Medicare services from Dr. Chapman across 4 procedure codes in 2024, for 124 Medicare patients. Medicare paid $7,875 for them. Every service was in an office.

CMS counts 124 Medicare patients who saw Dr. Chapman in 2024. The largest group is 65 to 74, with 58 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 18% are also on Medicaid. Their average risk score is 2.03, 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 67, with 53% women.

In 2024, Dr. Chapman wrote 251 Medicare Part D claims for 103 patients. 92% of them were for generic drugs. CMS names the drug for 201 of them, across 5 drugs with 11 or more claims each, at $2,459 in total drug cost. In 2023, CMS named 62 claims across 4 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. Chapman for performance year 2024, reported as part of a group. Dr. Chapman accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chapman as offering telehealth. CMS counts 25 procedures of colonoscopy by Dr. Chapman, more than 51% of the clinicians it reports for that procedure.

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

Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)

CMS Open Payments shows 20 general payments to Dr. Chapman from 11 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 43% of the total. Intuitive Surgical, Inc. paid the most, $2,029.

Dr. Chapman graduated from Georgetown University School of Medicine in 2015.