Dr. Megan Bradley Callahan, MD

Dr. Callahan practices at CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance.

Dr. Callahan's NPI, 1881662864, was assigned on March 8, 2006. Dr. Callahan holds Massachusetts license 229848.

Dr. Callahan's primary practice is CHA Cambridge Hospital, at 1493 Cambridge Street, Cambridge, MA 02139 in Middlesex County. The practice phone is (617) 665-1000.

Dr. Callahan's primary practice is CHA Cambridge Hospital in Cambridge, Massachusetts, part of Cambridge Health Alliance. Dr. Callahan is also affiliated with Massachusetts General Hospital. The medical group on file is Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP). Dmand AI also links Dr. Callahan to 3 more hospitals, 8 medical groups, 2 group practices and clinics, 2 hospices and 1 skilled nursing facility, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices, 10 sites in all. Vendor and product names are available with a free account.

Internal medicine is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Callahan is licensed in Massachusetts.

CMS data shows 612 Medicare services from Dr. Callahan across 9 procedure codes in 2024, for 364 Medicare patients. Medicare paid $56,915 for them.

CMS counts 364 Medicare patients who saw Dr. Callahan in 2024. The largest group is 85 and over, with 180 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 1.97, 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. Callahan's median patient age at 85, with 69% women.

In 2024, Dr. Callahan wrote 522 Medicare Part D claims for 75 patients. 81% of them were for generic drugs. CMS names the drug for 222 of them, across 13 drugs with 11 or more claims each, at $17,889 in total drug cost. In 2018, CMS named 12 claims across 1 drug.

Dr. Callahan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

CMS Open Payments shows 83 general payments to Dr. Callahan from 15 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Lundbeck LLC paid the most, $733.