Johanna Gerwer, MD, MPH
NPI 1043742588 · Endocrinology, Diabetes & Metabolism Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Johanna Gerwer, MD, MPH is a Endocrinology, Diabetes & Metabolism Physician provider in San Diego, CA (NPI 1043742588).
Provider details
- NPI number
- 1043742588
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH
- Sex
- Female
- Sole proprietor
- No
- License
- A169752 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
9 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metformin Hcl | 127 | 45 |
| Semaglutidebrand: Ozempic | 117 | 25 |
| Dulaglutidebrand: Trulicity | 105 | 32 |
| Empagliflozinbrand: Jardiance | 76 | 23 |
| Pen Needle, Diabeticbrand: Nano 2nd Gen Pen Needle | 75 | 27 |
| Levothyroxine Sodium | 69 | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$397 across 13 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-03
- Last updated
- 2022-09-13
- Certified
- 2022-09-13
Frequently asked questions
- What is Johanna Gerwer's NPI number?
- Johanna Gerwer's National Provider Identifier (NPI) is 1043742588, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Johanna Gerwer's specialty?
- Johanna Gerwer is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Johanna Gerwer located?
- Johanna Gerwer's practice location on file with NPPES is 1809 National Ave, San Diego, CA 92113-2113.
- What is Johanna Gerwer's phone number?
- The practice phone number listed in the NPPES registry for Johanna Gerwer is (619) 515-2300.
- Does Johanna Gerwer accept Medicare?
- Johanna Gerwer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Johanna Gerwer's NPI active?
- Yes — Johanna Gerwer's NPI (1043742588) is active in the NPPES registry as of the last update on 2022-09-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.