Siao-Yi Wang, M.D.
NPI 1134540859 · Medical Oncology Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Siao-Yi Wang, M.D. is a Medical Oncology Physician provider in Sacramento, CA (NPI 1134540859).
Provider details
- NPI number
- 1134540859
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 186824 (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
12 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
535 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 | 236 | $17 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 135 | $146 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 92 | $99 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 48 | $183 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 24 | $65 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dexamethasone | 54 | 23 |
| Prochlorperazine Maleate | 37 | 29 |
| Olanzapine | 34 | 15 |
| Ondansetron Hcl | 24 | 18 |
| Levothyroxine Sodiumbrand: Synthroid | 16 | — |
| Lidocaine Hclbrand: Lidocaine Hcl Viscous | 15 | — |
| Lenvatinib Mesylatebrand: Lenvima | 13 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$161 across 1 record (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
- 2013-12-23
- Last updated
- 2023-07-07
- Certified
- 2023-07-07
Frequently asked questions
- What is Siao-Yi Wang's NPI number?
- Siao-Yi Wang's National Provider Identifier (NPI) is 1134540859, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Siao-Yi Wang's specialty?
- Siao-Yi Wang is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Siao-Yi Wang located?
- Siao-Yi Wang's practice location on file with NPPES is 2279 45th St, Sacramento, CA 95817-1514.
- What is Siao-Yi Wang's phone number?
- The practice phone number listed in the NPPES registry for Siao-Yi Wang is (916) 734-5959.
- Does Siao-Yi Wang accept Medicare?
- Siao-Yi Wang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Siao-Yi Wang's NPI active?
- Yes — Siao-Yi Wang's NPI (1134540859) is active in the NPPES registry as of the last update on 2023-07-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.