Joseph Hsiao, MD
NPI 1699139287 · Endocrinology, Diabetes & Metabolism Physician · Orange, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Hsiao, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Orange, CA (NPI 1699139287).
Provider details
- NPI number
- 1699139287
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A153987 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
10 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
412 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 146 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 136 | $138 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 47 | $179 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 27 | $99 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 24 | $36 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 42 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Semaglutidebrand: Ozempic | 236 | 58 |
| Levothyroxine Sodium | 204 | 58 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 140 | 55 |
| Metformin Hclbrand: Metformin Hcl Er | 128 | 40 |
| Tirzepatidebrand: Mounjaro | 119 | 19 |
| Alendronate Sodium | 115 | 33 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$410 across 20 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-04-08
- Last updated
- 2025-12-03
- Certified
- 2025-12-03
Frequently asked questions
- What is Joseph Hsiao's NPI number?
- Joseph Hsiao's National Provider Identifier (NPI) is 1699139287, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Hsiao's specialty?
- Joseph Hsiao is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Hsiao located?
- Joseph Hsiao's practice location on file with NPPES is 2501 E Chapman Ave Ste 203, Orange, CA 92869-3204.
- What is Joseph Hsiao's phone number?
- The practice phone number listed in the NPPES registry for Joseph Hsiao is (714) 628-3230.
- Does Joseph Hsiao accept Medicare?
- Joseph Hsiao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Hsiao's NPI active?
- Yes — Joseph Hsiao's NPI (1699139287) is active in the NPPES registry as of the last update on 2025-12-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.