Johnna Gemelos, D.O.
Internal Medicine Physician · Chula Vista, CA
Johnna Gemelos, D.O. is an internal medicine physician with a practice address in Chula Vista, California, and NPI 1528300928, issued on Mar 23, 2013. Check the license (California 20A13681, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Johnna Gemelos
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A13681 CA
Self-reported in NPPES; status is on the state search - Practice location
- 435 H St, Chula Vista, CA 91910
- Phone
- (619) 691-7000
- Enumerated
- Mar 23, 2013
- Record last updated
- Jun 30, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160726001019); accepts Medicare assignment
- Medical or professional school
- West Virginia School Of Osteopathic Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 435 H St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Johnna Gemelos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A13681Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average internal medicine physician in 2024
588 Medicare Part D claims for 188 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 31 claims were for opioids.
Most prescribed
- Atorvastatin Calcium32 claims
- Cefuroxime24 claims
- Losartan Potassium24 claims
- Amlodipine Besylate20 claims
- Pantoprazole Sodium20 claims
- Furosemide17 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
- Scripps Health Inpatient Providers Medical Group IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Johnna Gemelos among 17,696 internal medicine physician records in California
Johnna Gemelos, D.O. 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 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2013 · median 2004 among the 11,065 with a school on file
- Record last updated2016 · 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
- Andres BustamanteChula Vista, CA 919101720199227
- Michael Chambers, M.D.Chula Vista, CA 919101740298843
- Rocio Flores, MDChula Vista, CA 919101881607067
- Hector Heredia-Martinez, M.D.Chula Vista, CA 919101699882365
- Alejandro Hinojosa-Valencia, MDChula Vista, CA 919101083701411
- Tom-Oliver Klein, MDChula Vista, CA 919101235161787
- Perry Montoya, M.DChula Vista, CA 919101003826256
- Taikeun Park, MDChula Vista, CA 919101831175918
Common questions
What is Johnna Gemelos, D.O.'s NPI number?
Johnna Gemelos, D.O.'s National Provider Identifier (NPI) is 1528300928, issued on Mar 23, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Johnna Gemelos, D.O. located?
The NPPES record lists a practice address at 435 H St, Chula Vista, CA, 91910. Phone: (619) 691-7000. Providers update this record themselves, so call before visiting.
How can I verify Johnna Gemelos, D.O.'s license?
NPPES lists California license number 20A13681, 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 Johnna Gemelos, D.O. prescribe under Medicare Part D?
In 2024, Johnna Gemelos, D.O. had 588 Medicare Part D claims for 188 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.