John Fox Mast, MD
Family Medicine Physician · Aurora, IL
John Fox Mast, MD is a family medicine physician with a practice address in Aurora, Illinois, and NPI 1811488646, issued on May 29, 2018. Check the license (Illinois 036156608, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Fox Mast
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 036156608 IL
125072449 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2000 Ogden Ave, Aurora, IL 60504
- Phone
- (866) 565-8607
- Enumerated
- May 29, 2018
- Record last updated
- Sep 25, 2025
- Fax
- (312) 563-8661
- Medicare enrollment
- Enrolled (PECOS I20210706001423); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 2000 Ogden Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Fox Mast 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 036156608Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average family medicine physician in 2024
295 Medicare Part D claims for 99 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Metoprolol Tartrate16 claims
- Metoprolol Succinate14 claims
- Atorvastatin Calcium13 claims
- Cephalexin13 claims
- Hydralazine Hcl12 claims
- Pantoprazole Sodium12 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 3 group practices
- Prime Healthcare Illinois Medical Group LLCAurora, IL
- Rush University Medical GroupChicago, IL
- Rush-Copley Medical Group NfpAurora, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Fox Mast among 6,215 family medicine physician records in Illinois
John Fox Mast, MD is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 75% of them.
- NPI issued2018 · 75% of these records are older, 22% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2018 · median 2006 among the 3,714 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
119 family medicine physician records list a practice address in Aurora
They are 119 of the 3,342 NPPES records with a practice address in Aurora, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Aurora → Family Medicine Physician nationwide →
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Common questions
What is John Fox Mast, MD's NPI number?
John Fox Mast, MD's National Provider Identifier (NPI) is 1811488646, issued on May 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is John Fox Mast, MD located?
The NPPES record lists a practice address at 2000 Ogden Ave, Aurora, IL, 60504. Phone: (866) 565-8607. Providers update this record themselves, so call before visiting.
How can I verify John Fox Mast, MD's license?
NPPES lists Illinois license number 036156608, 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 John Fox Mast, MD prescribe under Medicare Part D?
In 2024, John Fox Mast, MD had 295 Medicare Part D claims for 99 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.