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

Dr. William Mack Erwin, PHD

Individual provider Clinical Psychologist · NPI 1063562684

Dr. William Mack Erwin, PHD is a Clinical Psychologist in San Antonio, Texas. Graduated from Texas Tech University Health Science Center School of Medicine in 1971, 55 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in Texas.

Years since qualifying
55
Trained at
Texas Tech University Health Science Center School of Medicine
Licensed in
TX
In the registry since
2007
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

14815 San Pedro Ave
San Antonio, TX 78232-3708
Phone: (210) 494-1991
Fax: (210) 494-7575
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 20855 (TX)

Record details

NPI number1063562684
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJanuary 12, 2007
Last updated in NPPESJanuary 5, 2011

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolTEXAS TECH UNIVERSITY HEALTH SCIENCE CENTER SCHOOL OF MEDICINE
Graduated 1971 (55 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Other providers in San Antonio