Joanna L. Gunn, MD
Internal Medicine Physician · San Diego, CA
Joanna L. Gunn, MD is an internal medicine physician with a practice address in San Diego, California, and NPI 1427106210, issued on Jan 8, 2007. Check the license (California A89978, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joanna L. Gunn
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A89978 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4405 Vandever Ave, San Diego, CA 92120
- Phone
- (619) 528-5000
- Enumerated
- Jan 8, 2007
- Record last updated
- Nov 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A899780 CA
- Medicare enrollment
- Enrolled (PECOS I20051024000649); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4405 Vandever Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joanna L. Gunn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A89978Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% more Medicare Part D claims than the average internal medicine physician in 2024
5,807 Medicare Part D claims for 774 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. 283 claims were for opioids.
Most prescribed
- Atorvastatin Calcium472 claims
- Rosuvastatin Calcium322 claims
- Levothyroxine Sodium293 claims
- Losartan Potassium219 claims
- Amlodipine Besylate210 claims
- Lisinopril210 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 GroupLa Mesa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joanna L. Gunn among 17,696 internal medicine physician records in California
Joanna L. Gunn, 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
- Graduated2002 · 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
- Wilfredo Abesamis, M.D.San Diego, CA 921201992754832
- Kenneth Antons, M.D.San Diego, CA 921201982668182
- David Chang, M.D.San Diego, CA 921201073596342
- Fred Corey, M.D.San Diego, CA 921201912989674
- Elaine Gertser, MDSan Diego, CA 921201992719967
- Joanne Keenan, D.O.San Diego, CA 921201043281074
- Hyunsoo Kim, MDSan Diego, CA 921201598789737
- Murray Kornblit, M.D.San Diego, CA 921201932181682
Common questions
What is Joanna L. Gunn, MD's NPI number?
Joanna L. Gunn, MD's National Provider Identifier (NPI) is 1427106210, issued on Jan 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joanna L. Gunn, MD located?
The NPPES record lists a practice address at 4405 Vandever Ave, San Diego, CA, 92120. Phone: (619) 528-5000. Providers update this record themselves, so call before visiting.
How can I verify Joanna L. Gunn, MD's license?
NPPES lists California license number A89978, 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 Joanna L. Gunn, MD prescribe under Medicare Part D?
In 2024, Joanna L. Gunn, MD had 5,807 Medicare Part D claims for 774 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.