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

Mark Joseph Geslak, PA

Individual provider Medical Physician Assistant · NPI 1104898758

Mark Joseph Geslak, PA is a Medical Physician Assistant in Fort Sam Houston, Texas. Licensed in Texas. Registered with an NPI since 2006.

Licensed in
TX
In the registry since
2006
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

See every abbreviation used in this directory →

Practice location Address checks out

3851 Roger Brooke Dr Mche-Qd
Fort Sam Houston, TX 78234-4501
Phone: (210) 916-2460
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Physician Assistant (primary) Taxonomy 363AM0700X · Licence PA04593 (TX)

Record details

NPI number1104898758
Entity typeIndividual (Type 1)
GenderMale
Credentials PA
Sole proprietorNo
NPI enumeratedFebruary 6, 2006
Last updated in NPPESJuly 13, 2026
Mailing address4855 Encanto Creek Dr, San Antonio, TX 78247-5618

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