John Demask, D.O.
Family Medicine Physician · Minooka, IL
John Demask, D.O. is a family medicine physician with a practice address in Minooka, Illinois, and NPI 1174501134, issued on Jan 9, 2006. Check the license (Illinois 036094869, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Demask
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036094869 IL
Self-reported in NPPES; status is on the state search - Practice location
- 201 S Wabena Ave, Minooka, IL 60447
- Phone
- (815) 467-1518
- Enumerated
- Jan 9, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (815) 467-7419
- Medicaid ID
- 036094869-1 IL
- Medicare enrollment
- Enrolled (PECOS I20040601000713); accepts Medicare assignment
- Medical or professional school
- Chicago College Of Osteopathy, 1993
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 201 S Wabena Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Muhammed Khan, M.D.Internal Medicine Physician1386678183
Verify John Demask 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 036094869Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average family medicine physician in 2024
4,293 Medicare Part D claims for 303 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 166 claims were for opioids.
Most prescribed
- Amlodipine Besylate253 claims
- Levothyroxine Sodium205 claims
- Hydrochlorothiazide204 claims
- Atorvastatin Calcium193 claims
- Lisinopril187 claims
- Metformin Hcl167 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.
John Demask among 6,215 family medicine physician records in Illinois
John Demask, D.O. 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1993 · median 2006 among the 3,714 with a school on file
- Record last updated2007 · 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).
3 family medicine physician records list a practice address in Minooka
They are 3 of the 104 NPPES records with a practice address in Minooka, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Minooka → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Hassnain Syed, M.D.Minooka, IL 604471669798542
- Stephanie Whyte, M.D.Minooka, IL 604471710116546
- Galia Beitner, D.O.Mokena, IL 604481407879398
- Sital Bhargava, DOMokena, IL 604481093766420
- Rebecca Crainsmith, MDMokena, IL 604481528175015
- Michele Danaher, MDMokena, IL 604481679561773
- Theodore Jefferson, M.D.Mokena, IL 604481568495091
- Rosemary McGrath, MDMokena, IL 604481710947148
Common questions
What is John Demask, D.O.'s NPI number?
John Demask, D.O.'s National Provider Identifier (NPI) is 1174501134, issued on Jan 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Demask, D.O. located?
The NPPES record lists a practice address at 201 S Wabena Ave, Minooka, IL, 60447. Phone: (815) 467-1518. Providers update this record themselves, so call before visiting.
How can I verify John Demask, D.O.'s license?
NPPES lists Illinois license number 036094869, 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 Demask, D.O. prescribe under Medicare Part D?
In 2024, John Demask, D.O. had 4,293 Medicare Part D claims for 303 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.