Thomas Stephen Flach, DO
Family Medicine Physician · Western Springs, IL
Thomas Stephen Flach, DO is a family medicine physician with a practice address in Western Springs, Illinois, and NPI 1306933320, issued on Oct 10, 2006. Check the license (Illinois 036082941, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Thomas Stephen Flach
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036082941 IL
Self-reported in NPPES; status is on the state search - Practice location
- 512 Hillgrove Ave, Western Springs, IL 60558
- Phone
- (708) 246-4376
- Enumerated
- Oct 10, 2006
- Record last updated
- Aug 7, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (708) 246-2912
- Medicaid ID
- 036082941 IL
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Verify Thomas Stephen Flach 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 036082941Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
158 Medicare Part D claims for 87 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Simvastatin15 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.
Thomas Stephen Flach among 6,215 family medicine physician records in Illinois
Thomas Stephen Flach, DO 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 fileNo · 60% of these records are
- 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).
4 family medicine physician records list a practice address in Western Springs
They are 4 of the 283 NPPES records with a practice address in Western Springs, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Western Springs → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Karl Langner, DOWestern Springs, IL 605581144616954
- Monica Mozwecz, M.D.Western Springs, IL 605581083756050
- Rebecca Preston, M.D.Western Springs, IL 605581003883968
- Craig Anderson, M.D.Westmont, IL 605591326025347
- Anthony Auriemma, M.D., J.D.Westmont, IL 605591578507562
- Paul Bicek, M.D.Westmont, IL 605591578557716
- Maria Douros, DOWestmont, IL 605591700873106
- Gina Drugas, MDWestmont, IL 605591760457253
Common questions
What is Thomas Stephen Flach, DO's NPI number?
Thomas Stephen Flach, DO's National Provider Identifier (NPI) is 1306933320, issued on Oct 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Stephen Flach, DO located?
The NPPES record lists a practice address at 512 Hillgrove Ave, Western Springs, IL, 60558. Phone: (708) 246-4376. Providers update this record themselves, so call before visiting.
How can I verify Thomas Stephen Flach, DO's license?
NPPES lists Illinois license number 036082941, 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 Thomas Stephen Flach, DO prescribe under Medicare Part D?
In 2024, Thomas Stephen Flach, DO had 158 Medicare Part D claims for 87 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.