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

Dr. Mark John Sey, MD

Individual provider Pediatrics Physician · NPI 1366494718

Dr. Mark John Sey, MD is a Pediatrics Physician in Philadelphia, Pennsylvania. Practices as a sole proprietor. Licensed in Pennsylvania.

Licensed in
PA
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

6608 Castor Ave
Philadelphia, PA 19149-2120
Phone: (215) 342-7711
Fax: (215) 722-8712
Show map & directions

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

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence MD011601E (PA)

Record details

NPI number1366494718
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 16, 2006
Last updated in NPPESApril 4, 2013

Other providers in Philadelphia