Johnna Gemelos, D.O.
NPI 1528300928 · Internal Medicine Physician · Chula Vista, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Johnna Gemelos, D.O. is a Internal Medicine Physician provider in Chula Vista, CA (NPI 1528300928).
Provider details
- NPI number
- 1528300928
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 20A13681 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
375 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 266 | $121 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 80 | $118 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 29 | $176 |
Typical Medicare-allowed amounts for these services range $118–$176 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 32 | 28 |
| Cefuroxime Axetilbrand: Cefuroxime | 24 | 23 |
| Losartan Potassium | 24 | 20 |
| Amlodipine Besylate | 20 | 18 |
| Pantoprazole Sodium | 20 | 20 |
| Furosemide | 17 | 17 |
| Carvedilol | 16 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-03-23
- Last updated
- 2016-06-30
Frequently asked questions
- What is Johnna Gemelos's NPI number?
- Johnna Gemelos's National Provider Identifier (NPI) is 1528300928, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Johnna Gemelos's specialty?
- Johnna Gemelos is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Johnna Gemelos located?
- Johnna Gemelos's practice location on file with NPPES is 435 H St, Chula Vista, CA 91910-4307.
- What is Johnna Gemelos's phone number?
- The practice phone number listed in the NPPES registry for Johnna Gemelos is (619) 691-7000.
- Does Johnna Gemelos accept Medicare?
- Johnna Gemelos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Johnna Gemelos's NPI active?
- Yes — Johnna Gemelos's NPI (1528300928) is active in the NPPES registry as of the last update on 2016-06-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.