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

Mark A Williamson, MD

Individual provider Child & Adolescent Psychiatry Physician · NPI 1760591028

Mark A Williamson, MD is a Psychiatry in Houston, Texas. Graduated from University of Texas Medical Branch at Galveston in 1984, 42 years ago. Licensed in Texas.

Years since qualifying
42
Trained at
University of Texas Medical Branch at Galveston
Licensed in
TX
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5901 Long Dr
Houston, TX 77087-1003
Phone: (713) 970-7000
Fax: (713) 970-7246
Show map & directions

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

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence H4855 (TX)
Child & Adolescent Psychiatry Physician Taxonomy 2084P0804X · Licence H4855 (TX)

Record details

NPI number1760591028
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 30, 2006
Last updated in NPPESJanuary 29, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1984 (42 years in practice)
Accepts Medicare assignment Not indicated

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