Dr. Christopher Michael Brennan, MD

Dr. Brennan practices at Good Samaritan University Hospital in West Islip, New York, part of Diocese of Rockville Centre.

Dr. Brennan's NPI, 1174771323, was assigned on August 29, 2008. Dr. Brennan holds New York license 277549.

Dr. Brennan's primary practice is Good Samaritan University Hospital, at 1000 Montauk Highway, West Islip, NY 11795 in Suffolk County. The practice phone is (631) 376-3000.

Dr. Brennan's primary practice is Good Samaritan University Hospital in West Islip, New York, part of Diocese of Rockville Centre. The medical group on file is Southwest Suffolk Medical PC. Dmand AI also links Dr. Brennan to 1 more medical group, named with a free account.

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

Internal medicine is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Brennan's licenses on file in 3 states: New York, Massachusetts and Rhode Island.

CMS data shows 760 Medicare services from Dr. Brennan across 3 procedure codes in 2024, for 255 Medicare patients. Medicare paid $58,028 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 255 Medicare patients who saw Dr. Brennan in 2024. The largest group is 75 to 84, with 82 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 2.50, 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. Brennan's median patient age at 76, with 52% women.

In 2024, Dr. Brennan wrote 302 Medicare Part D claims for 130 patients. 88% of them were for generic drugs. CMS names the drug for 86 of them, across 4 drugs with 11 or more claims each, at $1,339 in total drug cost. In 2023, CMS named 91 claims across 6 drugs.

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

Dmand AI links 2 papers to Dr. Brennan in 2012. Dr. Brennan's most frequent co-author is Amit Mittal, MD.

CMS Open Payments shows 44 general payments to Dr. Brennan from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $233.