NPPES file of Aug 9, 2026

Thomas Triantafillou, M.D.

Geriatric Medicine (Internal Medicine) Physician · Oak Lawn, IL

Thomas Triantafillou, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Oak Lawn, Illinois, and NPI 1366504326, issued on Dec 15, 2006. Check the license (Illinois 036106624, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1366504326
Name
Thomas Triantafillou
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License numbers
036106624 IL
036-106624 IL
Self-reported in NPPES; status is on the state search
Practice location
4220 W 95TH St Ste 200, Oak Lawn, IL 60453
Phone
(708) 398-0287
Enumerated
Dec 15, 2006
Record last updated
Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
Fax
(708) 398-0285
Medicare enrollment
Enrolled (PECOS I20091008000297); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (internal medicine) physician records → All 179 in Illinois → Look up another NPI →

Also registered at 4220 W 95TH St Ste 200

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Christie Mena Adam, MDInternal Medicine Physician1548053085
  2. Zynab AdewusiInternal Medicine Physician1003757162
  3. Aisha Ahmed, MDInternal Medicine Physician1033969886
  4. Noor AlkhawamInternal Medicine Physician1801646161
  5. David Alter, MDInternal Medicine Physician1396301057
  6. Omair Arshad, DOInternal Medicine Physician1023703535

Verify Thomas Triantafillou in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036106624    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

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57% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

1,833 Medicare Part D claims for 210 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. 30 claims were for opioids.

  1. Thomas Triantafillou1,833
  2. Specialty average4,246

Most prescribed

  1. Eliquis92 claims
  2. Lisinopril85 claims
  3. Atorvastatin Calcium81 claims
  4. Amlodipine Besylate56 claims
  5. Aripiprazole53 claims
  6. Simvastatin48 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 one group practice

  1. Cook CountyChicago, IL

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Thomas Triantafillou among 179 geriatric medicine (internal medicine) physician records in Illinois

Thomas Triantafillou, M.D. is one of 179 geriatric medicine (internal medicine) physician records with a practice address in Illinois. 71% 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 8% of them.

  • NPI issued2006 · 8% of these records are older, 40% newer
  • In a Medicare fileYes · 71% of these records are
  • In the CMS Doctors and Clinicians fileYes · 42% of these records are
  • Graduated1998 · median 1997 among the 76 with a school on file
  • Record last updated2021 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Internal Medicine) Physician providers in Illinois

There are 179 geriatric medicine (internal medicine) physician records in Illinois.

All 179 in Illinois → Every provider in Oak Lawn → Geriatric Medicine (Internal Medicine) Physician nationwide →

The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes

  1. Patricia Rush, M.D.Hickory Hills, IL 604571154459840
  2. Beata Styka, M.D.Palos Heights, IL 604631275623233
  3. Anandavally PillaiJoliet, IL 604351821083791
  4. Brian Ragona, M.D.Joliet, IL 604351992701015
  5. Mona Tareen, M.D.Joliet, IL 604311558386581
  6. Tanjeev Kaur, M.D.Hazel Crest, IL 604291639123458
  7. Kathleen Oshea-Wilk, MDHazel Crest, IL 604291013923689
  8. Rekha Sharma, M.D.Hazel Crest, IL 604291619054228

Common questions

What is Thomas Triantafillou, M.D.'s NPI number?

Thomas Triantafillou, M.D.'s National Provider Identifier (NPI) is 1366504326, issued on Dec 15, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Thomas Triantafillou, M.D. located?

The NPPES record lists a practice address at 4220 W 95TH St Ste 200, Oak Lawn, IL, 60453. Phone: (708) 398-0287. Providers update this record themselves, so call before visiting.

How can I verify Thomas Triantafillou, M.D.'s license?

NPPES lists Illinois license number 036106624, 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 Triantafillou, M.D. prescribe under Medicare Part D?

In 2024, Thomas Triantafillou, M.D. had 1,833 Medicare Part D claims for 210 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.