John R. Walters, MD
Internal Medicine Physician · Oxnard, CA
John R. Walters, MD is an internal medicine physician with a practice address in Oxnard, California, and NPI 1013907203, issued on Oct 27, 2005. Check the license (California A46739, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John R. Walters
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A46739 CA
Self-reported in NPPES; status is on the state search - Practice location
- 703 N A St, Oxnard, CA 93030
- Phone
- (805) 485-2340
- Enumerated
- Oct 27, 2005
- Record last updated
- Sep 5, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (805) 485-1429
- Medicaid ID
- ZZZ80185Z CA
- Medicare enrollment
- Enrolled (PECOS I20120516000554); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1976
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify John R. Walters in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A46739Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% more Medicare Part D claims than the average internal medicine physician in 2024
5,058 Medicare Part D claims for 356 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 197 claims were for opioids.
Most prescribed
- Atorvastatin Calcium342 claims
- Lisinopril205 claims
- Amlodipine Besylate182 claims
- Levothyroxine Sodium150 claims
- Metformin Hcl146 claims
- Albuterol Sulfate Hfa129 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.
John R. Walters among 17,696 internal medicine physician records in California
John R. Walters, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1976 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
44 internal medicine physician records list a practice address in Oxnard
They are 44 of the 3,211 NPPES records with a practice address in Oxnard, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oxnard → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Avery, M.D.Oxnard, CA 930301891735486
- Richard Brand, MDOxnard, CA 930301770527608
- Dorothea Clayton, M.D.Oxnard, CA 930301053596395
- Romany Demian, M.D.Oxnard, CA 930301043232085
- Shiu Man Lee, M.D.Oxnard, CA 930301144397555
- Bernard McDermott, D.O.Oxnard, CA 930301821101841
- Myo Min, M.DOxnard, CA 930301407176670
- Robert Nguyen, MDOxnard, CA 930301780775718
Common questions
What is John R. Walters, MD's NPI number?
John R. Walters, MD's National Provider Identifier (NPI) is 1013907203, issued on Oct 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John R. Walters, MD located?
The NPPES record lists a practice address at 703 N A St, Oxnard, CA, 93030. Phone: (805) 485-2340. Providers update this record themselves, so call before visiting.
How can I verify John R. Walters, MD's license?
NPPES lists California license number A46739, 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. Walters, MD prescribe under Medicare Part D?
In 2024, John R. Walters, MD had 5,058 Medicare Part D claims for 356 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.