Jennifer Casey
Endocrinology, Diabetes & Metabolism Physician · Castro Valley, CA
Jennifer Casey is an endocrinology, diabetes & metabolism physician with a practice address in Castro Valley, California, and NPI 1750524575, issued on Apr 8, 2009. Check the license (California 20A11524, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer Casey
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 20A11524 CA
036141322 IL
Self-reported in NPPES; status is on the state search - Practice location
- 20101 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 204-1844
- Enumerated
- Apr 8, 2009
- Record last updated
- Nov 21, 2023
- Medicare enrollment
- Enrolled (PECOS I20121128000709); accepts Medicare assignment
- 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 20101 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tania Benjamin, MDPlastic Surgery within the Head & Neck (Otolaryngology) Physician1093276131
- Mandeep Chadha, AUDAudiologist1346078086
- Anthony Chan, M.D.Surgery Physician1285070235
- Phassarin Chansakul, MDPediatrics Physician1922413038
- Nalurporn Chokrungvaranon, M.D.Endocrinology, Diabetes & Metabolism Physician1922209436
- Huong Dang, MDFamily Medicine Physician1417390071
Verify Jennifer Casey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A11524Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
728 Medicare Part D claims for 111 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 56% of claims.
Most prescribed
- Ozempic109 claims
- Levothyroxine Sodium102 claims
- Mounjaro63 claims
- Alendronate Sodium43 claims
- Atorvastatin Calcium38 claims
- Jardiance37 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
- Sutter Bay Medical FoundationCastro Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jennifer Casey among 1,131 endocrinology, diabetes & metabolism physician records in California
Jennifer Casey 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 2009, is newer than 64% of them.
- NPI issued2009 · 64% of these records are older, 32% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2009 · median 2003 among the 779 with a school on file
- Record last updated2023 · 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 Castro Valley → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Amer Budayr, MDCastro Valley, CA 945461700958451
- Nalurporn Chokrungvaranon, M.D.Castro Valley, CA 945461922209436
- Samuel Fantaye, MDCastro Valley, CA 945461336677186
- Farnoosh FarrokhiCastro Valley, CA 945461467618454
- Susana Harbutt, M.D.Castro Valley, CA 945461588007678
- Marcia Peck, MDCastro Valley, CA 945461376569475
- Stanley Tan, MDCastro Valley, CA 945461396747721
- Frank Hsu, M.D.Hayward, CA 945411295800365
Common questions
What is Jennifer Casey's NPI number?
Jennifer Casey's National Provider Identifier (NPI) is 1750524575, issued on Apr 8, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Casey located?
The NPPES record lists a practice address at 20101 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 204-1844. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Casey's license?
NPPES lists California license number 20A11524, 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 Casey prescribe under Medicare Part D?
In 2024, Jennifer Casey had 728 Medicare Part D claims for 111 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.