NPPES file of Aug 9, 2026

Siao-Yi Wang, M.D.

Medical Oncology Physician · Sacramento, CA

Siao-Yi Wang, M.D. is a medical oncology physician with a practice address in Sacramento, California, and NPI 1134540859, issued on Dec 23, 2013. Check the license (California 186824, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1134540859
Name
Siao-Yi Wang
Credential
M.D.
Primary taxonomy
Medical Oncology Physician 207RX0202X
License number
186824 CA
Self-reported in NPPES; status is on the state search
Practice location
2279 45TH St, Sacramento, CA 95817
Phone
(916) 734-5959
Enumerated
Dec 23, 2013
Record last updated
Jul 7, 2023
Fax
(916) 703-5265
Medicare enrollment
Enrolled (PECOS I20230720001643); accepts Medicare assignment
Medical or professional school
University Of Iowa, Rj & L Carver College Of Medicine, 2010
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest medical oncology physician records → All 447 in California → Look up another NPI →

Also registered at 2279 45TH St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Maria Alexis Agustin, RNPediatric Oncology Registered Nurse1649000316
  2. Kavya Babu, MDInternal Medicine Physician1922682392
  3. Niri CarrollGenetic Counselor (M.S.)1174017149
  4. Guadalupe Carvajal, LCGCGenetic Counselor (M.S.)1730880444
  5. John CawleyNurse Practitioner1164153540
  6. Deanna ChavezPediatric Registered Nurse1427888122

Verify Siao-Yi Wang in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license 186824    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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54% fewer Medicare Part D claims than the average medical oncology physician in 2024

325 Medicare Part D claims for 57 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims. 18 claims were for opioids.

  1. Siao-Yi Wang325
  2. Specialty average703

Most prescribed

  1. Dexamethasone54 claims
  2. Prochlorperazine Maleate37 claims
  3. Olanzapine34 claims
  4. Ondansetron Hcl24 claims
  5. Synthroid16 claims
  6. Lidocaine Hcl Viscous15 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $160.99

1 payment: food and beverage; the largest payer was Tempus AI, Inc. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Siao-Yi Wang$161
  2. Specialty average$11,773

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Regents OF The Univ OF CASacramento, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Siao-Yi Wang among 447 medical oncology physician records in California

Siao-Yi Wang, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 77% of them.

  • NPI issued2013 · 77% of these records are older, 21% newer
  • In a Medicare fileYes · 82% of these records are
  • In the CMS Doctors and Clinicians fileYes · 70% of these records are
  • Graduated2010 · median 2004 among the 312 with a school on file
  • Record last updated2023 · 41% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Medical Oncology Physician providers in California

There are 447 medical oncology physician records in California.

All 447 in California → Every provider in Sacramento → Medical Oncology Physician nationwide →

The 8 medical oncology physician records with the nearest ZIP codes

  1. Janai Carr-Ascher, MD, PHDSacramento, CA 958171538401195
  2. Ryan Leibrandt, M.D.Sacramento, CA 958171801327044
  3. Neil Patel, M.D.Sacramento, CA 958171992817613
  4. Randeep Sangha, M.D.Sacramento, CA 958171952582199
  5. Casie Shenoy, M.D.Sacramento, CA 958171306135470
  6. John Fisher, M.D.Sacramento, CA 958161790704286
  7. Delphine Ong, M.D.Sacramento, CA 958161023034022
  8. Robert Quadro, M.D.Sacramento, CA 958161730293374

Common questions

What is Siao-Yi Wang, M.D.'s NPI number?

Siao-Yi Wang, M.D.'s National Provider Identifier (NPI) is 1134540859, issued on Dec 23, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Siao-Yi Wang, M.D. located?

The NPPES record lists a practice address at 2279 45TH St, Sacramento, CA, 95817. Phone: (916) 734-5959. Providers update this record themselves, so call before visiting.

How can I verify Siao-Yi Wang, M.D.'s license?

NPPES lists California license number 186824, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Siao-Yi Wang, M.D. prescribe under Medicare Part D?

In 2024, Siao-Yi Wang, M.D. had 325 Medicare Part D claims for 57 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.