Jennifer Sue Way Siani, M.D.
Endocrinology, Diabetes & Metabolism Physician · Westlake Village, CA
Jennifer Sue Way Siani, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Westlake Village, California, and NPI 1649613761, issued on Apr 8, 2013. Check the license (California A133595, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer Sue Way Siani
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- A133595 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1250 LA Venta Dr, Westlake Village, CA 91361
- Phone
- (805) 494-6920
- Enumerated
- Apr 8, 2013
- Record last updated
- Mar 20, 2026
- Fax
- (805) 494-6922
- Medicare enrollment
- Enrolled (PECOS I20180706001497); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 1250 LA Venta Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Chan, M.D.Neurological Surgery Physician1972531135
- Rauz Eshraghi, M.D.Internal Medicine Physician1619109378
- Stephanie Mandelman, M DObstetrics & Gynecology Physician1851315196
- Leena Nathan, M.D.Obstetrics & Gynecology Physician1417170523
- Anita Pakula, MDDermatology Physician1205869625
- Kathleen RussellClinical Social Worker1801749577
Verify Jennifer Sue Way Siani in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A133595Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,348 Medicare Part D claims for 383 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of claims.
Most prescribed
- Ozempic219 claims
- Levothyroxine Sodium215 claims
- Mounjaro178 claims
- Metformin Hcl Er145 claims
- Metformin Hcl128 claims
- Atorvastatin Calcium119 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $14.52
1 payment: education; the largest payer was Radius Health, Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- The Regents OF The University OF CaliforniaThousand Oaks, CA
- Venice Family ClinicVenice, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jennifer Sue Way Siani among 1,131 endocrinology, diabetes & metabolism physician records in California
Jennifer Sue Way Siani, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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, 20% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2013 · median 2003 among the 779 with a school on file
- Record last updated2026 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Westlake Village → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Lauren Beshay, MDThousand Oaks, CA 913601073010757
- Amy Chow, MDThousand Oaks, CA 913601316255748
- Joseph Pinzone, M.D.Thousand Oaks, CA 913601700893815
- Na Shen, M.D.Thousand Oaks, CA 913601225268824
- Sarfraz Zaidi, MDThousand Oaks, CA 913621427157536
- Mark Geller, M.D.Tarzana, CA 913561093710345
- Yehuda Handelsman, M.D.Tarzana, CA 913561063453769
- Stuart Kramer, M.D.Tarzana, CA 913561649310277
Common questions
What is Jennifer Sue Way Siani, M.D.'s NPI number?
Jennifer Sue Way Siani, M.D.'s National Provider Identifier (NPI) is 1649613761, issued on Apr 8, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Sue Way Siani, M.D. located?
The NPPES record lists a practice address at 1250 LA Venta Dr, Westlake Village, CA, 91361. Phone: (805) 494-6920. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Sue Way Siani, M.D.'s license?
NPPES lists California license number A133595, 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 Jennifer Sue Way Siani, M.D. prescribe under Medicare Part D?
In 2024, Jennifer Sue Way Siani, M.D. had 2,348 Medicare Part D claims for 383 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Jennifer Sue Way Siani, M.D.'s MIPS final score?
The 2023 MIPS final score is 86.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.