William Contreras, M.D.
Internal Medicine Physician · Chula Vista, CA
William Contreras, M.D. is an internal medicine physician with a practice address in Chula Vista, California, and NPI 1780694273, issued on Aug 8, 2006. Check the license (California G86860, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Contreras
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G86860 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1400 E Palomar St, Chula Vista, CA 91913
- Phone
- (858) 499-2616
- Enumerated
- Aug 8, 2006
- Record last updated
- Nov 21, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 00G868600 CA
- Medicare enrollment
- Enrolled (PECOS I20100902000885); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1400 E Palomar St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Contreras in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G86860Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
205 Medicare Part D claims for 109 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium16 claims
- Cefuroxime14 claims
- Doxycycline Hyclate11 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 practice group's MIPS final score for 2023 (Medicare payment program): 73.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Sharp Rees-Stealy Medical Group IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Contreras among 17,696 internal medicine physician records in California
William Contreras, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2012 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
81 internal medicine physician records list a practice address in Chula Vista
They are 81 of the 5,329 NPPES records with a practice address in Chula Vista, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Chula Vista → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Farschad Birdjandi, M.D.Chula Vista, CA 919131205823929
- Sheri Cameron, MDChula Vista, CA 919131568859411
- Brian Curley, M.DChula Vista, CA 919131700081569
- June Dela Cruz, M.D.Chula Vista, CA 919131689784886
- Edward GreeneChula Vista, CA 919131265401368
- Carlos Jimenez-Grillo, M.D.Chula Vista, CA 919131144267188
- Timothy Lee, M.D.Chula Vista, CA 919131962412403
- Bashar Mirza, M.D.Chula Vista, CA 919131164835898
Common questions
What is William Contreras, M.D.'s NPI number?
William Contreras, M.D.'s National Provider Identifier (NPI) is 1780694273, issued on Aug 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Contreras, M.D. located?
The NPPES record lists a practice address at 1400 E Palomar St, Chula Vista, CA, 91913. Phone: (858) 499-2616. Providers update this record themselves, so call before visiting.
How can I verify William Contreras, M.D.'s license?
NPPES lists California license number G86860, 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 William Contreras, M.D. prescribe under Medicare Part D?
In 2024, William Contreras, M.D. had 205 Medicare Part D claims for 109 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is William Contreras, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 of 100, reported for the practice group. 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.