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

Dr. John T Hammer, MD

Individual provider Internal Medicine Physician · NPI 1184731754

Dr. John T Hammer, MD is an Internal Medicine Physician in Garrison, New York. Licensed in New York. Registered with an NPI since 2006.

Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

Rte 9 & Graymoor St Christopher's Inn
Garrison, NY 10524
Phone: (845) 424-3616
Fax: (845) 424-3598
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 155011-1 (NY)

Record details

NPI number1184731754
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 23, 2006
Last updated in NPPESJuly 8, 2007