Diana Hsu, M.D.
NPI 1720090137 · Internal Medicine Physician · Downey, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Hsu, M.D. is a Internal Medicine Physician provider in Downey, CA (NPI 1720090137).
Provider details
- NPI number
- 1720090137
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A62369 (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 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 115 | 36 |
| Amlodipine Besylate | 103 | 38 |
| Atenolol | 91 | 22 |
| Hydralazine Hcl | 80 | 27 |
| Metformin Hcl | 75 | 29 |
| Lisinopril | 58 | 21 |
| Losartan Potassium | 58 | 18 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-13
- Last updated
- 2008-04-09
Frequently asked questions
- What is Diana Hsu's NPI number?
- Diana Hsu's National Provider Identifier (NPI) is 1720090137, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Hsu's specialty?
- Diana Hsu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Hsu located?
- Diana Hsu's practice location on file with NPPES is 12651 Lakewood Blvd, Downey, CA 90242-4563.
- What is Diana Hsu's phone number?
- The practice phone number listed in the NPPES registry for Diana Hsu is (562) 861-3111.
- Does Diana Hsu accept Medicare?
- Diana Hsu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Hsu's NPI active?
- Yes — Diana Hsu's NPI (1720090137) is active in the NPPES registry as of the last update on 2008-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.