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

John Grady Williams, MD

Individual provider Diagnostic Radiology Physician · NPI 1902855281

John Grady Williams, MD is a Diagnostic Radiology in Austin, Texas. Graduated from Texas Tech University Health Science Center School of Medicine in 2001, 25 years ago. Practices with Singleton Associates PA, a 795-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
25
Trained at
Texas Tech University Health Science Center School of Medicine
Licensed in
TX
In the registry since
2006
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

12554 Riata Vista Cir
Austin, TX 78727-6431
Phone: (512) 795-5100
Fax: (512) 795-5122
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence M6955 (TX)

Record details

NPI number1902855281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 6, 2006
Last updated in NPPESOctober 3, 2018
Mailing address12554 Riata Vista Cir, Austin, TX 78727-6431

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolTEXAS TECH UNIVERSITY HEALTH SCIENCE CENTER SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Singleton Associates Pa — 795 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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