Janet Hahn, MD
NPI 1841362654 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Hahn, MD is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1841362654).
Provider details
- NPI number
- 1841362654
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A67633 (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 · 81 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 422 | 168 |
| Amlodipine Besylate | 380 | 140 |
| Levothyroxine Sodium | 256 | 94 |
| Lisinopril | 243 | 96 |
| Atenolol | 174 | 64 |
| Losartan Potassium | 164 | 70 |
| Meloxicam | 114 | 48 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-15
- Last updated
- 2022-01-10
Frequently asked questions
- What is Janet Hahn's NPI number?
- Janet Hahn's National Provider Identifier (NPI) is 1841362654, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Hahn's specialty?
- Janet Hahn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Janet Hahn located?
- Janet Hahn's practice location on file with NPPES is 1425 S Main St, Walnut Creek, CA 94596-5318.
- What is Janet Hahn's phone number?
- The practice phone number listed in the NPPES registry for Janet Hahn is (925) 295-4000.
- Does Janet Hahn accept Medicare?
- Janet Hahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Hahn's NPI active?
- Yes — Janet Hahn's NPI (1841362654) is active in the NPPES registry as of the last update on 2022-01-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.