Registry record
- NPI
- 1104898758
- Profession
- Physician Assistant (PA)
- Specialty
- Medical Physician Assistant (363AM0700X)
- Practice address
- 3851 Roger Brooke Dr, Mche-Qd
Fort Sam Houston, TX 78234 - Phone
- 2109162460
- In the registry since
- February 6, 2006
- Last NPPES update
- July 8, 2007
- Sole proprietor
- Yes
- License
- PA04593 (TX)
At this location
54 other providers in our data list 3851 Roger Brooke Dr, Fort Sam Houston as a practice address:
- Francis Kobina Agyapong, NP
Acute Care Nurse Practitioner · NPI 1013056704
- Abad Ahmed, PHYSICIAN ASSISTANT
Medical Physician Assistant · NPI 1578532321
- Paul Benjamin Allen SR., PA-C, MPAS, DSC EMPA
Medical Physician Assistant · NPI 1922065234
- Mr. Garrett Raymond Baer, PA
Physician Assistant · NPI 1407845498
- Holly Booker
Physician Assistant · NPI 1609035955
- Harry Cecil Bradstreet JR.
Acute Care Nurse Practitioner · NPI 1346413069
- Nicole Marie Bucci, RN, FNP
Family Nurse Practitioner · NPI 1750612164
- Mr. Wayne Leroy Carpenter II, P.A.
Physician Assistant · NPI 1215927686
- Ms. Monica Ladean Casmaer, PHYSICIAN ASSISTANT
Physician Assistant · NPI 1629059050
- Julia M Ceremuga, CRNP
Family Nurse Practitioner · NPI 1093796856
In context
The NPI number of Mark Geslak is 1104898758. They are a Medical Physician Assistant in Fort Sam Houston, Texas.
Mark Geslak is one of 42 Medical Physician Assistants in Fort Sam Houston and one of 2,844 across Texas in our data.
The NPI has been in the federal registry for 20 years, since February 6, 2006.
Frequently asked questions
What is NPI 1104898758?
NPI 1104898758 is the 10-digit National Provider Identifier assigned to Mark Geslak, a Medical Physician Assistant practicing in Fort Sam Houston, Texas. The record has been in the NPPES registry since February 6, 2006.
How do I verify this provider?
Cross-check NPI 1104898758 in the official CMS registry at npiregistry.cms.hhs.gov, and confirm license PA04593 with the TX licensing board. You can also run the number through our free NPI validator to confirm its checksum.
Is this information current?
This profile reflects the June 2026 NPPES data file. NPPES lists the record's last update as July 8, 2007. We refresh our data each month when CMS publishes a new file.
Data: NPPES public registry, June 2026 file. Not medical advice. Verify independently before care or credentialing decisions. Errors in the source record can be corrected at nppes.cms.hhs.gov; see our corrections page.