Xavier Guillermo Ortiz, M.D.
Obstetrics & Gynecology Physician · Vallejo, CA
Xavier Guillermo Ortiz, M.D. is an obstetrics & gynecology physician with a practice address in Vallejo, California, and NPI 1952304859, issued on May 24, 2005. Check the license (California G148485, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Xavier Guillermo Ortiz
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G148485 CA
Self-reported in NPPES; status is on the state search - Practice location
- 975 Sereno Dr, Vallejo, CA 94589
- Phone
- (707) 914-6399
- Enumerated
- May 24, 2005
- Record last updated
- May 12, 2023
- Medicare enrollment
- Enrolled (PECOS I20230623000406); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 975 Sereno Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joel Aandahl, NPAdult Health Nurse Practitioner1891423653
- Noman Absar, MDCritical Care Medicine (Internal Medicine) Physician1205908951
- Anthony Acquaviva, MDUrology Physician1457439283
- Jhonnard James Acuna, CRNACertified Registered Nurse Anesthetist1205997327
- Omid AfshariPharmacist1184165391
- Eesha AftabStudent in an Organized Health Care Education/Training Program1770421687
Verify Xavier Guillermo Ortiz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G148485Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
152 Medicare Part D claims for 85 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Estradiol28 claims
- Clobetasol Propionate17 claims
- Progesterone13 claims
- Fluconazole11 claims
- Nitrofurantoin Mono-Macro11 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.
Bills Medicare through one group practice
- Permanente Medical Group IncNapa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Xavier Guillermo Ortiz among 5,088 obstetrics & gynecology physician records in California
Xavier Guillermo Ortiz, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1991 · median 2004 among the 2,700 with a school on file
- Record last updated2023 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Vallejo → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Anahita Bunce, MDVallejo, CA 945891578601571
- Nicole Buscaglia, MDVallejo, CA 945891205914041
- Peter Coffin, MDVallejo, CA 945891750469599
- Thomas Downs, MDVallejo, CA 945891932287778
- Ruth Goldenberg, MDVallejo, CA 945891932287752
- Nancy Goler, MDVallejo, CA 945891992881429
- Neha Kamdar, M.D.Vallejo, CA 945891982669008
- Diane Kelley, MDVallejo, CA 945891295813012
Common questions
What is Xavier Guillermo Ortiz, M.D.'s NPI number?
Xavier Guillermo Ortiz, M.D.'s National Provider Identifier (NPI) is 1952304859, issued on May 24, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Xavier Guillermo Ortiz, M.D. located?
The NPPES record lists a practice address at 975 Sereno Dr, Vallejo, CA, 94589. Phone: (707) 914-6399. Providers update this record themselves, so call before visiting.
How can I verify Xavier Guillermo Ortiz, M.D.'s license?
NPPES lists California license number G148485, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Xavier Guillermo Ortiz, M.D. prescribe under Medicare Part D?
In 2024, Xavier Guillermo Ortiz, M.D. had 152 Medicare Part D claims for 85 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
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.