Thomas Triantafillou, M.D.
NPI 1366504326 · Geriatric Medicine (Internal Medicine) Physician · Oak Lawn, IL
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Triantafillou, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Oak Lawn, IL (NPI 1366504326).
Provider details
- NPI number
- 1366504326
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036-106624 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
238 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 58 | $130 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 57 | $185 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 49 | $9 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 20 | $77 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 17 | $168 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 92 | 15 |
| Lisinopril | 85 | 27 |
| Atorvastatin Calcium | 81 | 24 |
| Amlodipine Besylate | 56 | 19 |
| Aripiprazole | 53 | — |
| Simvastatin | 48 | 14 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-15
- Last updated
- 2021-12-15
- Certified
- 2021-12-15
Frequently asked questions
- What is Thomas Triantafillou's NPI number?
- Thomas Triantafillou's National Provider Identifier (NPI) is 1366504326, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Triantafillou's specialty?
- Thomas Triantafillou is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Triantafillou located?
- Thomas Triantafillou's practice location on file with NPPES is 4220 W 95th St Ste 200, Oak Lawn, IL 60453-3072.
- What is Thomas Triantafillou's phone number?
- The practice phone number listed in the NPPES registry for Thomas Triantafillou is (708) 398-0287.
- Does Thomas Triantafillou accept Medicare?
- Thomas Triantafillou is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Triantafillou's NPI active?
- Yes — Thomas Triantafillou's NPI (1366504326) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.