Ralph Johnson, M.D.
NPI 1669673505 · Internal Medicine Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Johnson, M.D. is a Internal Medicine Physician provider in San Diego, CA (NPI 1669673505).
Provider details
- NPI number
- 1669673505
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A100739 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 127 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 445 | 183 |
| Amlodipine Besylate | 339 | 135 |
| Rosuvastatin Calcium | 323 | 128 |
| Losartan Potassium | 283 | 109 |
| Lisinopril | 276 | 120 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 271 | 56 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-29
- Last updated
- 2021-12-01
Frequently asked questions
- What is Ralph Johnson's NPI number?
- Ralph Johnson's National Provider Identifier (NPI) is 1669673505, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Johnson's specialty?
- Ralph Johnson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Johnson located?
- Ralph Johnson's practice location on file with NPPES is 4650 Palm Ave, San Diego, CA 92154-8404.
- What is Ralph Johnson's phone number?
- The practice phone number listed in the NPPES registry for Ralph Johnson is (800) 290-5000.
- Does Ralph Johnson accept Medicare?
- Ralph Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Johnson's NPI active?
- Yes — Ralph Johnson's NPI (1669673505) is active in the NPPES registry as of the last update on 2021-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.