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

Guillermo A. Ortiz San Juan, MD

Individual provider Gastroenterology Physician · NPI 1083098784

Guillermo A. Ortiz San Juan, MD is a Gastroenterology in Dublin, Ohio. Qualified in 2012, 14 years ago. Practices with Osu Internal Medicine LLC, a 1,145-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
14
Licensed in
OH
In the registry since
2015
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

6700 University Blvd
Dublin, OH 43016-3508
Phone: (614) 293-6255
Fax: (614) 293-8518
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 35.142043 (OH)

Record details

NPI number1083098784
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 13, 2015
Last updated in NPPESApril 20, 2026
Certification dateApril 20, 2026

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice Osu Internal Medicine Llc — 1145 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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