Claire Horton, MD
NPI 1649374109 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Claire Horton, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1649374109).
Provider details
- NPI number
- 1649374109
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A71387 (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 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 45 | 13 |
| Amlodipine Besylate | 44 | 12 |
| Levothyroxine Sodium | 28 | — |
| Finasteride | 26 | — |
| Gabapentin | 24 | — |
| Fluticasone Propionate | 22 | — |
| Benazepril Hcl | 22 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-12
- Last updated
- 2007-12-18
Frequently asked questions
- What is Claire Horton's NPI number?
- Claire Horton's National Provider Identifier (NPI) is 1649374109, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claire Horton's specialty?
- Claire Horton is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Claire Horton located?
- Claire Horton's practice location on file with NPPES is 3451 E 12th Street, Oakland, CA 94601.
- What is Claire Horton's phone number?
- The practice phone number listed in the NPPES registry for Claire Horton is (510) 535-3500.
- Does Claire Horton accept Medicare?
- Claire Horton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Claire Horton's NPI active?
- Yes — Claire Horton's NPI (1649374109) is active in the NPPES registry as of the last update on 2007-12-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.