Thomas Olsen, M.D.
NPI 1235142274 · Internal Medicine Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Olsen, M.D. is a Internal Medicine Physician provider in Saint Louis, MO (NPI 1235142274).
Provider details
- NPI number
- 1235142274
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- R2C73 (MO)
Specialties & taxonomies
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
466 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 98 | $64 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 96 | $125 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 71 | $128 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 65 | $96 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 63 | $89 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 164 | 45 |
| Lisinopril | 162 | 50 |
| Atorvastatin Calcium | 155 | 48 |
| Hydrochlorothiazide | 128 | 35 |
| Losartan Potassium | 101 | 23 |
| Tramadol Hcl | 95 | 20 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-14
- Last updated
- 2009-03-30
Frequently asked questions
- What is Thomas Olsen's NPI number?
- Thomas Olsen's National Provider Identifier (NPI) is 1235142274, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Olsen's specialty?
- Thomas Olsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Olsen located?
- Thomas Olsen's practice location on file with NPPES is 3660 Vista Ave, Saint Louis, MO 63110-2540.
- What is Thomas Olsen's phone number?
- The practice phone number listed in the NPPES registry for Thomas Olsen is (314) 977-6100.
- Does Thomas Olsen accept Medicare?
- Thomas Olsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Olsen's NPI active?
- Yes — Thomas Olsen's NPI (1235142274) is active in the NPPES registry as of the last update on 2009-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.