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

Dr. Mark Harrison Showen, MD

Individual provider Pediatrics Physician · NPI 1477576817

Dr. Mark Harrison Showen, MD is a Pediatrics Physician in San Mateo, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
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

50 S San Mateo Dr Ste 180
San Mateo, CA 94401-3857
Phone: (650) 342-4145
Fax: (650) 342-2070
Show map & directions

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

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence G052160 (CA)

Record details

NPI number1477576817
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 26, 2006
Last updated in NPPESJuly 8, 2007

Other providers in San Mateo