Ralph Sellers Johnson, M.D.
Internal Medicine Physician · San Diego, CA
Ralph Sellers Johnson, M.D. is an internal medicine physician with a practice address in San Diego, California, and NPI 1669673505, issued on May 29, 2007. Check the license (California A100739, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph Sellers Johnson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A100739 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4650 Palm Ave, San Diego, CA 92154
- Phone
- (800) 290-5000
- Enumerated
- May 29, 2007
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080125000531); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At San Antonio, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4650 Palm Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ralph Sellers Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A100739Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,661 Medicare Part D claims for 1,135 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 590 claims were for opioids.
Most prescribed
- Atorvastatin Calcium445 claims
- Amlodipine Besylate339 claims
- Rosuvastatin Calcium323 claims
- Losartan Potassium283 claims
- Lisinopril276 claims
- Hydrocodone-Acetaminophen271 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
- Southern California Permanente Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ralph Sellers Johnson among 17,696 internal medicine physician records in California
Ralph Sellers Johnson, 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 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
- Graduated2004 · 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).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Diego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- David Fan, M.D.San Diego, CA 921541326488040
- Christopher Fields, MDSan Diego, CA 921541427623677
- Silvia Munoz, M.D.San Diego, CA 921541326458613
- Parvaneh Najafi, M.D.San Diego, CA 921541275771974
- Fauzi Najar, MDSan Diego, CA 921541689166977
- Miguel Pena-Ruiz, M.D.San Diego, CA 921541063622819
Common questions
What is Ralph Sellers Johnson, M.D.'s NPI number?
Ralph Sellers Johnson, M.D.'s National Provider Identifier (NPI) is 1669673505, issued on May 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ralph Sellers Johnson, M.D. located?
The NPPES record lists a practice address at 4650 Palm Ave, San Diego, CA, 92154. Phone: (800) 290-5000. Providers update this record themselves, so call before visiting.
How can I verify Ralph Sellers Johnson, M.D.'s license?
NPPES lists California license number A100739, 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 Ralph Sellers Johnson, M.D. prescribe under Medicare Part D?
In 2024, Ralph Sellers Johnson, M.D. had 8,661 Medicare Part D claims for 1,135 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.