Cy Stein, MD
Medical Oncology Physician · Duarte, CA
Cy Stein, MD is a medical oncology physician with a practice address in Duarte, California, and NPI 1871673350, issued on Oct 17, 2006. Check the license (California G89157, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Cy Stein
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License numbers
- G89157 CA
157794 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Duarte RD, Duarte, CA 91010
- Phone
- (626) 471-3890
- Enumerated
- Oct 17, 2006
- Record last updated
- Nov 13, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (626) 471-7322
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 1500 Duarte RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cy Stein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G89157Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average medical oncology physician in 2024
67 Medicare Part D claims, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Duloxetine Hcl12 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.
Cy Stein among 447 medical oncology physician records in California
Cy Stein, MD 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2020 · 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).
48 medical oncology physician records list a practice address in Duarte
They are 48 of the 1,287 NPPES records with a practice address in Duarte, and 447 medical oncology physician records in California.
All 447 in California → Every provider in Duarte → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Linda Bosserman, M.D., F.A.C.PDuarte, CA 910101346289824
- Cathie Chung, M.D.Duarte, CA 910101679599914
- Lee Cranmer, MD, PHDDuarte, CA 910101861465759
- Tanya Dorff, M.D.Duarte, CA 910101508879115
- Manana Elia, M.D.Duarte, CA 910101609841816
- Marwan Fakih, MDDuarte, CA 910101861498271
- Marianna Koczywas, MDDuarte, CA 910101639286677
- Dean Lim, MDDuarte, CA 910101790892735
Common questions
What is Cy Stein, MD's NPI number?
Cy Stein, MD's National Provider Identifier (NPI) is 1871673350, issued on Oct 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cy Stein, MD located?
The NPPES record lists a practice address at 1500 Duarte RD, Duarte, CA, 91010. Phone: (626) 471-3890. Providers update this record themselves, so call before visiting.
How can I verify Cy Stein, MD's license?
NPPES lists California license number G89157, 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 Cy Stein, MD prescribe under Medicare Part D?
In 2024, Cy Stein, MD had 67 Medicare Part D claims; 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.
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.