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

Mark A Weiss, MD

Individual provider Internal Medicine Physician · NPI 1699857508

Mark A Weiss, MD is an Internal Medicine Physician in Philadelphia, Pennsylvania. Licensed in Pennsylvania. Registered with an NPI since 2006.

Licensed in
PA
In the registry since
2006
Specialties on file
3
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

925 Chestnut St Ste 320A
Philadelphia, PA 19107-4216
Phone: (215) 955-8874
Fax: (215) 955-2340
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

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence MD438863 (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD438863 (PA)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence MD438863 (PA)

Record details

NPI number1699857508
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 19, 2006
Last updated in NPPESOctober 6, 2011

Other providers in Philadelphia