Yio-Fan Hsu, M.D.
NPI 1588989529 · Internal Medicine Physician · Orange, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yio-Fan Hsu, M.D. is a Internal Medicine Physician provider in Orange, CA (NPI 1588989529).
Provider details
- NPI number
- 1588989529
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A118854 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 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
299 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 35 Minutes99232 | 199 | $81 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 35 | $85 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 24 | $178 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 16 | $119 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 13 | $134 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 12 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 18 | 18 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-04-01
- Last updated
- 2021-11-03
- Certified
- 2021-11-03
Frequently asked questions
- What is Yio-Fan Hsu's NPI number?
- Yio-Fan Hsu's National Provider Identifier (NPI) is 1588989529, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yio-Fan Hsu's specialty?
- Yio-Fan Hsu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Yio-Fan Hsu located?
- Yio-Fan Hsu's practice location on file with NPPES is 2501 E Chapman Ave, Orange, CA 92869-3204.
- What is Yio-Fan Hsu's phone number?
- The practice phone number listed in the NPPES registry for Yio-Fan Hsu is (714) 633-1011.
- Does Yio-Fan Hsu accept Medicare?
- Yio-Fan Hsu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yio-Fan Hsu's NPI active?
- Yes — Yio-Fan Hsu's NPI (1588989529) is active in the NPPES registry as of the last update on 2021-11-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.