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

Dr. Timothy Ian Mackenzie Mercer, MD

Individual provider Pediatrics Physician · NPI 1215337092

Dr. Timothy Ian Mackenzie Mercer, MD is an Internal Medicine in Austin, Texas. Graduated from Indiana University School of Medicine in 2011, 15 years ago. Practices with Seton Family of Doctors, a 785-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
15
Trained at
Indiana University School of Medicine
Licensed in
TX
In the registry since
2014
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

1601 Trinity St
Austin, TX 78712-1765
Phone: (512) 978-8130
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 5339 N Ih 35 Ste 100, Austin, TX 78723-2558 — (512) 978-8130

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence R4099 (TX)
Pediatrics Physician Taxonomy 208000000X · Licence R4099 (TX)

Record details

NPI number1215337092
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 28, 2014
Last updated in NPPESJuly 26, 2025
Certification dateJuly 26, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Seton Family Of Doctors — 785 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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