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

Dr. Mark R Siegelheim, MD

Individual provider Internal Medicine Physician · NPI 1235134602

Dr. Mark R Siegelheim, MD is an Internal Medicine Physician in Bay Shore, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

200 Howells Rd
Bay Shore, NY 11706-5300
Phone: (631) 665-5074
Fax: (631) 665-1852
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 152199 (NY)

Record details

NPI number1235134602
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 14, 2005
Last updated in NPPESJuly 8, 2007

Other providers in Bay Shore