Graham Thomas McMahon, M.D., M.M.SC.
Endocrinology, Diabetes & Metabolism Physician · Chicago, IL
Graham Thomas McMahon, M.D., M.M.SC. is an endocrinology, diabetes & metabolism physician with a practice address in Chicago, Illinois, and NPI 1275512477, issued on Jan 16, 2006. Check the license (Illinois 036.139549, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Graham Thomas McMahon
- Credential
- M.D., M.M.SC.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 036.139549 IL
205297 MA
Self-reported in NPPES; status is on the state search - Practice location
- 4025 N Sheridan RD, Chicago, IL 60613
- Phone
- (773) 388-1600
- Enumerated
- Jan 16, 2006
- Record last updated
- Jul 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (773) 388-1602
- Medicaid ID
- 036.139549 IL
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 436 in Illinois → Look up another NPI →
Also registered at 4025 N Sheridan RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristin Baker, P.A.-CMedical Physician Assistant1235154097
- Kunal Bakshi, M.D.Family Medicine Physician1033591037
- David Blatt, M.D.Internal Medicine Physician1639185150
- Amaya Blue-FarrellPhysician Assistant1053050542
- Aleksander CasasProfessional Counselor1851064372
- Armand Cerbone, PH.D.Psychologist1043370653
Verify Graham Thomas McMahon 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 036.139549Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
126 Medicare Part D claims for 19 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 68% of claims.
Most prescribed
- Mounjaro15 claims
- Trulicity15 claims
- Atorvastatin Calcium11 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.
Graham Thomas McMahon among 436 endocrinology, diabetes & metabolism physician records in Illinois
Graham Thomas McMahon, M.D., M.M.SC. 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 fileNo · 68% of these records are
- Record last updated2021 · 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
- Mounika Lakshmi Allam, MDChicago, IL 606121043960040
- Keenan BayrakdarChicago, IL 606121063090207
- Mario Campana Delgado, MDChicago, IL 606121386204626
- Sylvia Chlebek, DOChicago, IL 606121114554300
- Amna Elahi, MDChicago, IL 606121487148136
- Julie Fedorko, DOChicago, IL 606121548919954
- Shriya Gandhi, MDChicago, IL 606121306375514
- Sofia Garcia-Buder, M.D.Chicago, IL 606141780622183
Common questions
What is Graham Thomas McMahon, M.D., M.M.SC.'s NPI number?
Graham Thomas McMahon, M.D., M.M.SC.'s National Provider Identifier (NPI) is 1275512477, issued on Jan 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Graham Thomas McMahon, M.D., M.M.SC. located?
The NPPES record lists a practice address at 4025 N Sheridan RD, Chicago, IL, 60613. Phone: (773) 388-1600. Providers update this record themselves, so call before visiting.
How can I verify Graham Thomas McMahon, M.D., M.M.SC.'s license?
NPPES lists Illinois license number 036.139549, 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 Graham Thomas McMahon, M.D., M.M.SC. prescribe under Medicare Part D?
In 2024, Graham Thomas McMahon, M.D., M.M.SC. had 126 Medicare Part D claims for 19 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.