Leon Fogelfeld, M.D.
Endocrinology, Diabetes & Metabolism Physician · Chicago, IL
Leon Fogelfeld, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Chicago, Illinois, and NPI 1699732305, issued on Apr 27, 2006. Check the license (Illinois 036-078595, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Leon Fogelfeld
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 036-078595 IL
C175830 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1725 W Harrison St, Chicago, IL 60612
- Phone
- (312) 942-6163
- Enumerated
- Apr 27, 2006
- Record last updated
- Nov 1, 2023
- Medicare enrollment
- Enrolled (PECOS I20220809002317); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 436 in Illinois → Look up another NPI →
Also registered at 1725 W Harrison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Eda Akyar, MDSports Medicine (Family Medicine) Physician1255910006
- Jorelle Alexander, DMD,MPHDentist1972790756
- Amjad Ali, M.D.Specialist1952359184
Verify Leon Fogelfeld in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-078595Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
925 Medicare Part D claims for 118 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
- Levothyroxine Sodium61 claims
- Metformin Hcl61 claims
- Ozempic61 claims
- Nano 2nd Gen Pen Needle46 claims
- Lantus Solostar45 claims
- Jardiance39 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
- County OF VenturaVentura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leon Fogelfeld among 436 endocrinology, diabetes & metabolism physician records in Illinois
Leon Fogelfeld, M.D. is one of 436 endocrinology, diabetes & metabolism physician records with a practice address in Illinois. 85% 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, 62% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1975 · median 2006 among the 295 with a school on file
- Record last updated2023 · 46% 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 Illinois 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 Illinois
There are 436 endocrinology, diabetes & metabolism physician records in Illinois.
All 436 in Illinois → Every provider in Chicago → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Ambika Amblee, MDChicago, IL 606121225090590
- Antonio Bianco, M.D.Chicago, IL 606121720225188
- Yuval Eisenberg, M.D.Chicago, IL 606121366685828
- Rasa Kazlauskaite, MD, MSC, FACEChicago, IL 606121487609954
- Subhash Kukreja, M.D.Chicago, IL 606121962511238
- Evelyn Lacuesta, M.D.Chicago, IL 606121730122672
- Susana Mascarell, M.DChicago, IL 606121700831328
- Dan Mihailescu, MDChicago, IL 606121104951250
Common questions
What is Leon Fogelfeld, M.D.'s NPI number?
Leon Fogelfeld, M.D.'s National Provider Identifier (NPI) is 1699732305, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leon Fogelfeld, M.D. located?
The NPPES record lists a practice address at 1725 W Harrison St, Chicago, IL, 60612. Phone: (312) 942-6163. Providers update this record themselves, so call before visiting.
How can I verify Leon Fogelfeld, M.D.'s license?
NPPES lists Illinois license number 036-078595, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leon Fogelfeld, M.D. prescribe under Medicare Part D?
In 2024, Leon Fogelfeld, M.D. had 925 Medicare Part D claims for 118 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.