Guillermo A. Ortiz San Juan, MD
Gastroenterology Physician · Dublin, OH
Guillermo A. Ortiz San Juan, MD is a gastroenterology physician with a practice address in Dublin, Ohio, and NPI 1083098784, issued on Jul 13, 2015. Check the license (Ohio 35.142043, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Guillermo A. Ortiz San Juan
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 35.142043 OH
Self-reported in NPPES; status is on the state search - Practice location
- 6700 University Blvd, Dublin, OH 43016
- Phone
- (614) 293-6255
- Enumerated
- Jul 13, 2015
- Record last updated
- Apr 20, 2026
- Fax
- (614) 293-8518
- Medicare enrollment
- Enrolled (PECOS I20211006001178); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 741 in Ohio → Look up another NPI →
Also registered at 6700 University Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Guillermo A. Ortiz San Juan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35.142043Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average gastroenterology physician in 2024
168 Medicare Part D claims for 63 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Omeprazole53 claims
- Gavilyte-G18 claims
- Colestipol Hcl14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 95.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Osu Internal Medicine LLCDublin, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Guillermo A. Ortiz San Juan among 741 gastroenterology physician records in Ohio
Guillermo A. Ortiz San Juan, MD is one of 741 gastroenterology physician records with a practice address in Ohio. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 83% of them.
- NPI issued2015 · 83% of these records are older, 13% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2012 · median 2003 among the 540 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Ohio
There are 741 gastroenterology physician records in Ohio.
All 741 in Ohio → Every provider in Dublin → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Scott Arlin, MDDublin, OH 430161962495465
- Ryan Gaible, MDDublin, OH 430161366564197
- Bruce Hennessy, MDDublin, OH 430161891788386
- Jennifer Jeng, D.ODublin, OH 430161699155234
- Peter Lee, MB BCHDublin, OH 430161528374501
- Christopher Mabee, MDDublin, OH 430161952395295
- Tara Menon, MDDublin, OH 430161477879948
- Marty Meyer, MDDublin, OH 430161396787362
Common questions
What is Guillermo A. Ortiz San Juan, MD's NPI number?
Guillermo A. Ortiz San Juan, MD's National Provider Identifier (NPI) is 1083098784, issued on Jul 13, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo A. Ortiz San Juan, MD located?
The NPPES record lists a practice address at 6700 University Blvd, Dublin, OH, 43016. Phone: (614) 293-6255. Providers update this record themselves, so call before visiting.
How can I verify Guillermo A. Ortiz San Juan, MD's license?
NPPES lists Ohio license number 35.142043, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Guillermo A. Ortiz San Juan, MD prescribe under Medicare Part D?
In 2024, Guillermo A. Ortiz San Juan, MD had 168 Medicare Part D claims for 63 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Guillermo A. Ortiz San Juan, MD's MIPS final score?
The 2023 MIPS final score is 95.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.