Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Jan Claassen, MD

Individual provider Neurocritical Care Physician · NPI 1073649497

Dr. Jan Claassen, MD is registered under Critical Care (Intensivists) in New York, New York. Qualified in 1998, 28 years ago. Practices with Trustees of Columbia University in the City of New York, a 2,250-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
28
Licensed in
NY
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

710 W 168th St
New York, NY 10032-3726
Phone: (212) 939-1338
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurocritical Care Physician (primary) Taxonomy 2084A2900X · Licence 244606 (NY)
Neurology Physician Taxonomy 2084N0400X · Licence 244606 (NY)

Record details

NPI number1073649497
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 27, 2007
Last updated in NPPESApril 2, 2020
Certification dateApril 2, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCRITICAL CARE (INTENSIVISTS)
Also practisesNEUROLOGY
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice Trustees Of Columbia University In The City Of New York — 2250 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients60
Services billed 202 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Trustees of Columbia University in the City of New York

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2250 clinicians in the practice; 12 are shown here.

Other providers in New York