Yu-Nan Hsu, D.O
NPI 1922382407 · Hospitalist Physician · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yu-Nan Hsu, D.O is a Hospitalist Physician provider in Fountain Valley, CA (NPI 1922382407).
Provider details
- NPI number
- 1922382407
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O
- Sex
- Male
- Sole proprietor
- No
- License
- A11894 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,804 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 1,038 | $122 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 680 | $81 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 271 | $119 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 182 | $179 |
| Advance Care Planning, First 30 Minutes99497 | 172 | $78 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 154 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 69 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 171 | 45 |
| Apixabanbrand: Eliquis | 96 | 25 |
| Amlodipine Besylate | 94 | 37 |
| Metoprolol Tartrate | 84 | 32 |
| Metformin Hcl | 83 | 18 |
| Pantoprazole Sodium | 80 | 31 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-10-03
- Last updated
- 2016-12-28
Frequently asked questions
- What is Yu-Nan Hsu's NPI number?
- Yu-Nan Hsu's National Provider Identifier (NPI) is 1922382407, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yu-Nan Hsu's specialty?
- Yu-Nan Hsu is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Yu-Nan Hsu located?
- Yu-Nan Hsu's practice location on file with NPPES is 11037 Warner Ave, Fountain Valley, CA 92708-4007.
- What is Yu-Nan Hsu's phone number?
- The practice phone number listed in the NPPES registry for Yu-Nan Hsu is (800) 641-4651.
- Does Yu-Nan Hsu accept Medicare?
- Yu-Nan Hsu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yu-Nan Hsu's NPI active?
- Yes — Yu-Nan Hsu's NPI (1922382407) is active in the NPPES registry as of the last update on 2016-12-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.