Mark Geslak, PA
NPI 1104898758 · Medical Physician Assistant · Fort Sam Houston, TX
Mark Geslak, PA is a Medical Physician Assistant provider in Fort Sam Houston, TX (NPI 1104898758).
Provider details
- NPI number
- 1104898758
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA
- Sex
- Male
- License
- PA04593 (TX)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-06
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Geslak's NPI number?
- Mark Geslak's National Provider Identifier (NPI) is 1104898758, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Geslak's specialty?
- Mark Geslak is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Geslak located?
- Mark Geslak's practice location on file with NPPES is 3851 Roger Brooke Dr, Fort Sam Houston, TX 78234-4501.
- What is Mark Geslak's phone number?
- The practice phone number listed in the NPPES registry for Mark Geslak is (210) 916-2460.
- Is Mark Geslak's NPI active?
- Yes — Mark Geslak's NPI (1104898758) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.