Dr. Jan Claassen, MD

Dr. Claassen practices at Columbia University Irving Medical Center in New York, New York.

Dr. Claassen's NPI, 1073649497, was assigned on February 27, 2007. Dr. Claassen holds New York license 244606.

Dr. Claassen's primary practice is Columbia University Irving Medical Center, at 622 W 168th St, New York, NY 10032 in New York County. The practice phone is (212) 297-4255.

Dr. Claassen's primary practice is Columbia University Irving Medical Center in New York, New York. Dr. Claassen is also affiliated with NewYork-Presbyterian/Weill Cornell Medical Center. The medical group on file is ColumbiaDoctors. Dmand AI also links Dr. Claassen to 1 more group practice or clinic, named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Claassen practices, 2 sites in all. Vendor and product names are available with a free account.

Neurocritical care is Dr. Claassen's primary specialty in the NPI Registry, under taxonomy code 2084A2900X. Dr. Claassen is licensed in New York.

CMS data shows 162 Medicare services from Dr. Claassen across 1 procedure code in 2024, for 60 Medicare patients. Medicare paid $32,393 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 60 Medicare patients who saw Dr. Claassen in 2024. The largest group is 75 to 84, with 23 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 48% are also on Medicaid. Their average risk score is 3.96, 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. Claassen's median patient age at 73, with 42% women.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Claassen for performance year 2024, reported through an alternative payment model (APM). Dr. Claassen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Dmand AI links 239 papers to Dr. Claassen, published from 2003 to 2025. 2020 was the busiest year, with 17. The most frequent topics are Subarachnoid Hemorrhage, Electroencephalography and Cerebral Hemorrhage. Dr. Claassen has published most often in Neurocrit Care. Dr. Claassen's most frequent co-authors are Edward Sander Connolly, MD, David Jinou Roh, MD and Soojin Park, MD.

CMS Open Payments shows 66 general payments to Dr. Claassen from 12 drug and device companies from 2016 to 2024. Consulting fees make up the largest share, 69% of the total. UCB, Inc. paid the most, $8,796.

Dr. Claassen is in network with 4 carriers, including Aetna, Cigna and CMS Medicare. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.