Dr. Johnna Gemelos, DO
- Medicare services, 2024
- 375
- Medicare patients, 2024
- 143
- Part D claims, 2024
- 588
- Hospital affiliations
- 1
- Industry payments
- $124
- Practice address
- 435 H St, Chula Vista, CA 91910
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Chula Vista / Mri - HOPD
Acute Care Hospital outpatient department · Chula Vista, California
Find Dr. Gemelos' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Johnna Gemelos is an internist in Chula Vista, California
Dr. Gemelos practices at Chula Vista / Mri - HOPD in Chula Vista, California.
Dr. Gemelos' NPI, 1528300928, was assigned on March 23, 2013. Dr. Gemelos graduated from West Virginia School Of Osteopathic Medicine in 2013. Dr. Gemelos' California license number on file is 20A13681.
- NPI
- 1528300928NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8022301209
- NPI enumeration date
- March 23, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Johnna Gemelos practices at Chula Vista / Mri - HOPD in Chula Vista, California
Dr. Gemelos' primary practice is Chula Vista / Mri - HOPD, at 435 H St, Chula Vista, CA 91910.
- Chula Vista / Mri - HOPD435 H St, Chula Vista, CA 91910
Source: Dmand AI Affiliation Data
Dr. Johnna Gemelos is affiliated with 4 sites of care and 2 medical groups
Dr. Gemelos' primary practice is Chula Vista / Mri - HOPD in Chula Vista, California. Dr. Gemelos is also affiliated with Scripps Mercy Hospital San Diego. The medical group on file is SHIPMG Radiology. Dmand AI also links Dr. Gemelos to 2 more group practices and clinics and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Johnna Gemelos' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gemelos practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Chula Vista / Mri - HOPD | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Johnna Gemelos is one of 16,751 internists in California
Internal medicine is Dr. Gemelos' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gemelos is board certified in internal medicine by the American Board of Internal Medicine. Dr. Gemelos has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists congestive heart failure, dementia, gastrointestinal inflammation, gastrointestinal obstruction, heart attack, kidney failure, sepsis and substance abuse among the conditions Dr. Gemelos treats.
Internists near Dr. Gemelos
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Johnna Gemelos billed Medicare for 375 services in 2024
CMS data shows 375 Medicare services from Dr. Gemelos across 3 procedure codes in 2024, for 143 Medicare patients. Medicare paid $35,696 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Gemelos' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3892024: 3754%
Dr. Gemelos compared with the California median for internists, 2024
- Dr. Gemelos
- California median
- Medicare services
- 375vs 361Close to median
- Medicare patients
- 143vs 1515% below
- Part D claims
- 240vs 42143% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Gemelos' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Gemelos?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gemelos and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Johnna Gemelos treated 143 Medicare patients in 2024, average age 75
CMS counts 143 Medicare patients who saw Dr. Gemelos in 2024. The largest group is 65 to 74, with 54 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 69% are also on Medicaid. Their average risk score is 3.05, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Gemelos' median patient age at 75, with 49% women.
Dr. Gemelos' Medicare patients by age, 2024
Dr. Gemelos' Medicare patients by sex, 2024
- Women6848%
- Men7552%
Chronic conditions among Dr. Gemelos' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes58%
- Heart failure55%
- Chronic kidney disease53%
- Arthritis47%
- Mood disorders45%
- COPD43%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gemelos' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Johnna Gemelos wrote 588 Medicare Part D claims in 2024
In 2024, Dr. Gemelos wrote 588 Medicare Part D claims for 188 patients. 78% of them were for generic drugs. CMS names the drug for 240 of them, across 14 drugs with 11 or more claims each, at $8,989 in total drug cost. In 2023, CMS named 249 claims across 14 drugs.
Dr. Gemelos' Part D claims by kind of drug, 2024
- Generic460 claims78%
- Brand-name105 claims18%
- Other23 claims4%
Dr. Gemelos' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Gemelos' Part D claims, 2024
- Opioids5%31 of 588 claims
- Antibiotics14%84 of 588 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2492024: 2404%
Drugs named by CMS: 14 in 2024, 14 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Johnna Gemelos takes part in Medicare
Dr. Gemelos accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Johnna Gemelos received $124 in industry payments in 2022
CMS Open Payments shows 2 general payments to Dr. Gemelos from 1 drug or device company in 2022. Food and beverage make up the largest share, 100% of the total. ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) paid the most, $124.
Companies that paid Dr. Gemelos the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Johnna Gemelos graduated from West Virginia School Of Osteopathic Medicine
Dr. Gemelos graduated from West Virginia School Of Osteopathic Medicine in 2013.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Johnna Gemelos accepts plans from 8 insurance carriers
Dr. Gemelos is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- RI State Medicaid
Plan types Dr. Gemelos accepts, by number of carriers
- Medicare6
- PPO5
- HMO3
- POS3
- EPO2
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Johnna Gemelos's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Johnna Gemelos
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Johnna Gemelos' NPI number?
Dr. Johnna Gemelos' NPI number is 1528300928. It was assigned on March 23, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. Johnna Gemelos?
Dr. Johnna Gemelos is an internist in Chula Vista, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Johnna Gemelos practice?
Dr. Gemelos practices at 435 H St, Chula Vista, CA 91910. Dr. Gemelos' primary practice is Chula Vista / Mri - HOPD in Chula Vista, California. Dmand AI also links Dr. Gemelos to 2 group practices and clinics and 1 medical group.
What is Dr. Johnna Gemelos' medical license number?
Dr. Gemelos' California license number on file is 20A13681.
Which hospitals is Dr. Johnna Gemelos affiliated with?
Dr. Gemelos is affiliated with Scripps Mercy Hospital San Diego.
What medical group is Dr. Johnna Gemelos part of?
Dr. Gemelos is linked to SHIPMG Radiology. Dmand AI links Dr. Gemelos to 1 more medical group.
Does Dr. Johnna Gemelos accept Medicare?
Yes. CMS data shows Dr. Gemelos billed Medicare for 375 services in 2024, and Dr. Gemelos accepts Medicare assignment.
How many Medicare patients does Dr. Johnna Gemelos see?
CMS counts 143 Medicare patients who saw Dr. Gemelos in 2024, with an average age of 75.
Is Dr. Johnna Gemelos board certified?
Yes. Dr. Gemelos is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Johnna Gemelos bill to Medicare?
In 2024, Dr. Gemelos' most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99239) and hospital inpatient care (99223).
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Where did Dr. Johnna Gemelos go to medical school?
Dr. Gemelos graduated from West Virginia School Of Osteopathic Medicine in 2013.
What drugs does Dr. Johnna Gemelos prescribe most?
In 2024 Medicare Part D data, Dr. Gemelos' most prescribed drugs by claims were Atorvastatin Calcium, Cefuroxime and Losartan Potassium.
Has Dr. Johnna Gemelos received payments from drug or device companies?
CMS Open Payments shows $124 in general payments to Dr. Gemelos from 1 company from 2022 to 2022. The largest total came from ZOLL Services LLC (A/K/A ZOLL LifeCor Corp).
How long has Dr. Johnna Gemelos been practicing?
Dr. Gemelos graduated from medical school in 2013, 13 years ago.
What insurance does Dr. Johnna Gemelos accept?
Dr. Gemelos is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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