John R. Dexter, MD
Internal Medicine Physician · Ventura, CA
John R. Dexter, MD is an internal medicine physician with a practice address in Ventura, California, and NPI 1710034970, issued on Jan 3, 2007. Check the license (California G38860, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John R. Dexter
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G38860 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2705 Loma Vista RD Ste 205, Ventura, CA 93003
- Phone
- (805) 585-3086
- Enumerated
- Jan 3, 2007
- Record last updated
- Oct 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070410000241); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2705 Loma Vista RD Ste 205
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Mitchell, MDInternal Medicine Physician1598705485
- Bridget Wareham, FNP-CFamily Nurse Practitioner1639636905
Verify John R. Dexter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G38860Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
112 Medicare Part D claims for 51 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of 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): 0 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).
Industry payments in 2024: $300.63
14 payments; by number, the most common kind was food and beverage; the largest payer was Smith+Nephew, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John R. Dexter among 17,696 internal medicine physician records in California
John R. Dexter, MD 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1977 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
68 internal medicine physician records list a practice address in Ventura
They are 68 of the 4,435 NPPES records with a practice address in Ventura, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Ventura → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Deborah Carlson, M.D.Ventura, CA 930031942231121
- James Estes, M.D.Ventura, CA 930031336176098
- Doina Galiatzatos, M.D.Ventura, CA 930031548206089
- Scott Goodfriend, M.D.Ventura, CA 930031982636965
- Arthur Inoshita, MDVentura, CA 930031932105277
- Albert Kam, M.D.Ventura, CA 930031114953593
- Karen Lockwood, MDVentura, CA 930031558330399
- James Mitchell, MDVentura, CA 930031598705485
Common questions
What is John R. Dexter, MD's NPI number?
John R. Dexter, MD's National Provider Identifier (NPI) is 1710034970, issued on Jan 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John R. Dexter, MD located?
The NPPES record lists a practice address at 2705 Loma Vista RD Ste 205, Ventura, CA, 93003. Phone: (805) 585-3086. Providers update this record themselves, so call before visiting.
How can I verify John R. Dexter, MD's license?
NPPES lists California license number G38860, 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 John R. Dexter, MD prescribe under Medicare Part D?
In 2024, John R. Dexter, MD had 112 Medicare Part D claims for 51 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is John R. Dexter, MD's MIPS final score?
The 2023 MIPS final score is 0 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.