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

Individual provider Psychiatry Physician · NPI 1639348246

Dr. William Dewayne Holmes, MD is a Psychiatry in Austin, Texas. Qualified in 1987, 39 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
39
Licensed in
TX
In the registry since
2008
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

12515 Research Blvd Bldg 8 Ste 400
Austin, TX 78759-2228
Phone: (210) 241-2691
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence H4418 (TX)
Child & Adolescent Psychiatry Physician Taxonomy 2084P0804X · Licence H4418 (TX)

Record details

NPI number1639348246
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 27, 2008
Last updated in NPPESOctober 11, 2013

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolOTHER
Graduated 1987 (39 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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