Jeffrey Robert Unger, M.D.
Endocrinology, Diabetes & Metabolism Physician · Rancho Cucamonga, CA
Jeffrey Robert Unger, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Rancho Cucamonga, California, and NPI 1003856188, issued on Jun 7, 2006. Check the license (California G45569, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jeffrey Robert Unger
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- G45569 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9220 Haven Ave Ste 230, Rancho Cucamonga, CA 91730
- Phone
- (909) 590-8409
- Enumerated
- Jun 7, 2006
- Record last updated
- May 18, 2026
- Fax
- (909) 590-8695
- Medicare enrollment
- Enrolled (PECOS I20081010000546); may accept Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1980
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Verify Jeffrey Robert Unger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G45569Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,398 Medicare Part D claims for 83 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims. 30 claims were for opioids.
Most prescribed
- Atorvastatin Calcium97 claims
- Jardiance97 claims
- Pantoprazole Sodium86 claims
- Kerendia84 claims
- Ozempic84 claims
- Losartan Potassium74 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: $87,711.94
134 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. 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.
Jeffrey Robert Unger among 1,131 endocrinology, diabetes & metabolism physician records in California
Jeffrey Robert Unger, 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1980 · 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 Rancho Cucamonga → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Silvana Giannelli, MDRancho Cucamonga, CA 917301821295247
- William Kurban, MDGlendora, CA 917411134385271
- Radha Reddy, MDClaremont, CA 917111780652073
- Hsiang-Shien Chen, M.D.Chino, CA 917101962401489
- Sadiq Mandilawi, MDLa Verne, CA 917501295716736
- Jeffrey Mason, M.D.La Verne, CA 917501255308912
- Erik VillafanaChino, CA 917101043102494
- Nisha Jayani, M.D.Chino Hills, CA 917091124354584
Common questions
What is Jeffrey Robert Unger, M.D.'s NPI number?
Jeffrey Robert Unger, M.D.'s National Provider Identifier (NPI) is 1003856188, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey Robert Unger, M.D. located?
The NPPES record lists a practice address at 9220 Haven Ave Ste 230, Rancho Cucamonga, CA, 91730. Phone: (909) 590-8409. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey Robert Unger, M.D.'s license?
NPPES lists California license number G45569, 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 Jeffrey Robert Unger, M.D. prescribe under Medicare Part D?
In 2024, Jeffrey Robert Unger, M.D. had 2,398 Medicare Part D claims for 83 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.