Sylvia L. Chi-Wu, MD
Nephrology Physician · Walnut Creek, CA
Sylvia L. Chi-Wu, MD is a nephrology physician with a practice address in Walnut Creek, California, and NPI 1144308230, issued on Nov 2, 2006. Check the license (California A69704, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sylvia L. Chi-Wu
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A69704 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4000
- Enumerated
- Nov 2, 2006
- Record last updated
- Jan 10, 2022
- Medicaid ID
- 00A697040 CA
- Medicare enrollment
- Enrolled (PECOS I20031114000693); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Basil Adad, MDOtolaryngology Physician1487732574
- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Sylvia L. Chi-Wu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A69704Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average nephrology physician in 2024
1,059 Medicare Part D claims for 164 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Furosemide106 claims
- Amlodipine Besylate65 claims
- Losartan Potassium60 claims
- Jardiance56 claims
- Sevelamer Carbonate51 claims
- Calcitriol47 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.
Bills Medicare through one group practice
- Permanente Medical Group IncWalnut Creek, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sylvia L. Chi-Wu among 1,468 nephrology physician records in California
Sylvia L. Chi-Wu, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1998 · median 2001 among the 1,128 with a school on file
- Record last updated2022 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Walnut Creek → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Manasi Bapat, MDWalnut Creek, CA 945961861834996
- Andrew Lin, M.D.Walnut Creek, CA 945961558484857
- Jamal Mogannam, MDWalnut Creek, CA 945961053483891
- John Valdin, MDWalnut Creek, CA 945961609954767
- May Chiu, MDWalnut Creek, CA 945981407857329
- Mario Curzi, MDWalnut Creek, CA 945981336140359
- Robert Davies, MDWalnut Creek, CA 945981215937933
- Carol Diraimondo, MDWalnut Creek, CA 945981265433288
Common questions
What is Sylvia L. Chi-Wu, MD's NPI number?
Sylvia L. Chi-Wu, MD's National Provider Identifier (NPI) is 1144308230, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sylvia L. Chi-Wu, MD located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4000. Providers update this record themselves, so call before visiting.
How can I verify Sylvia L. Chi-Wu, MD's license?
NPPES lists California license number A69704, 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 Sylvia L. Chi-Wu, MD prescribe under Medicare Part D?
In 2024, Sylvia L. Chi-Wu, MD had 1,059 Medicare Part D claims for 164 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.
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.