Dr. John Stewart Herndon, MD

Dr. Herndon practices at Birmingham Gastroenterology Associates in Birmingham, Alabama.

Dr. Herndon's NPI, 1770080400, was assigned on April 9, 2018. Dr. Herndon holds Alabama license MD.38885.

Dr. Herndon's primary practice is Birmingham Gastroenterology Associates, at 1 Independence Plaza Ste 410, Birmingham, AL 35209. The practice phone is (205) 271-8000.

Dr. Herndon's primary practice is Birmingham Gastroenterology Associates in Birmingham, Alabama. Dr. Herndon is also affiliated with Grandview Medical Center. The medical group on file is Birmingham Gastroenterology Associates. Dmand AI also links Dr. Herndon to 3 more hospitals and 1 group practice or clinic, each named with a free account. Dr. Herndon's employer is on file too: a clinical lab.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Herndon practices, 6 sites in all. Vendor and product names are available with a free account.

Gastroenterology is Dr. Herndon's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Herndon is licensed in Alabama.

CMS data shows 44 Medicare services from Dr. Herndon across 3 procedure codes in 2024, for 83 Medicare patients. Medicare paid $4,686 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 83 Medicare patients who saw Dr. Herndon in 2024. The largest group is 65 to 74, with 28 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.96, 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. Herndon's median patient age at 60, with 56% women.

In 2024, Dr. Herndon wrote 83 Medicare Part D claims for 43 patients. 76% of them were for generic drugs. CMS names the drug for 13 of them, across 1 drug with 11 or more claims each, at $99 in total drug cost. In 2023, CMS named 36 claims across 3 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 77 out of 100 for Dr. Herndon for performance year 2024, reported as part of a group. Dr. Herndon accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 153 procedures of colonoscopy by Dr. Herndon, more than 89% of the clinicians it reports for that procedure.

Dmand AI links 1 paper to Dr. Herndon in 2020. Dr. Herndon's most frequent co-author is Swaroop P. Vitta, MD.

CMS Open Payments shows 98 general payments to Dr. Herndon from 21 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. Sanofi and Genzyme US Companies paid the most, $670.