Joan Duffy, MD
NPI 1235206186 · Geriatric Medicine (Family Medicine) Physician · Bellflower, CA
Enrolled with Medicare as Practitioner - Hospice/Palliative Care · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joan Duffy, MD is a Geriatric Medicine (Family Medicine) Physician provider in Bellflower, CA (NPI 1235206186).
Provider details
- NPI number
- 1235206186
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Family Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G72810 (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 · 70 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 219 | 118 |
| Lisinopril | 131 | 50 |
| Amlodipine Besylate | 128 | 60 |
| Hydralazine Hcl | 120 | 34 |
| Famotidine | 118 | 70 |
| Gabapentin | 112 | 51 |
| Losartan Potassium | 91 | 52 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2021-11-29
Frequently asked questions
- What is Joan Duffy's NPI number?
- Joan Duffy's National Provider Identifier (NPI) is 1235206186, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joan Duffy's specialty?
- Joan Duffy is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Joan Duffy located?
- Joan Duffy's practice location on file with NPPES is 9400 Rosecrans Ave, Bellflower, CA 90706-2246.
- What is Joan Duffy's phone number?
- The practice phone number listed in the NPPES registry for Joan Duffy is (562) 461-3000.
- Does Joan Duffy accept Medicare?
- Joan Duffy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joan Duffy's NPI active?
- Yes — Joan Duffy's NPI (1235206186) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.