Timothy Steven Mason, MD
Internal Medicine Physician · Maywood, IL
Timothy Steven Mason, MD is an internal medicine physician with a practice address in Maywood, Illinois, and NPI 1366145583, issued on Mar 27, 2023. Check the license (Illinois 125.081655, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Timothy Steven Mason
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 125.081655 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2160 S 1St Ave, Maywood, IL 60153
- Phone
- (888) 584-7888
- Enumerated
- Mar 27, 2023
- Record last updated
- Jun 12, 2023
- Entity
- Type 1 · individual
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Verify Timothy Steven Mason 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 125.081655Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
104 Medicare Part D claims for 29 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Timothy Steven Mason among 7,238 internal medicine physician records in Illinois
Timothy Steven Mason, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 82% of them.
- NPI issued2023 · 82% of these records are older, 13% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2023 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
257 internal medicine physician records list a practice address in Maywood
They are 257 of the 2,572 NPPES records with a practice address in Maywood, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Maywood → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Boblick, MDMaywood, IL 601531932173267
- James Boblick, MDMaywood, IL 601531386618429
- Bradley Clifford, MDMaywood, IL 601531912971227
- Josephine Dlugopolski-Gach, MDMaywood, IL 601531679543151
- Kevin Embach, M.D.Maywood, IL 601531437151974
- Maureen Fearon, MDMaywood, IL 601531144294463
- Elizabeth Frye, MDMaywood, IL 601531295709509
- Sam Hung, MDMaywood, IL 601531750352753
Common questions
What is Timothy Steven Mason, MD's NPI number?
Timothy Steven Mason, MD's National Provider Identifier (NPI) is 1366145583, issued on Mar 27, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Steven Mason, MD located?
The NPPES record lists a practice address at 2160 S 1St Ave, Maywood, IL, 60153. Phone: (888) 584-7888. Providers update this record themselves, so call before visiting.
How can I verify Timothy Steven Mason, MD's license?
NPPES lists Illinois license number 125.081655, 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 Timothy Steven Mason, MD prescribe under Medicare Part D?
In 2024, Timothy Steven Mason, MD had 104 Medicare Part D claims for 29 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.