Thomas Tan, MD
NPI 1275528382 · Hematology & Oncology Physician · Lake St Louis, MO
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Tan, MD is a Hematology & Oncology Physician provider in Lake St Louis, MO (NPI 1275528382).
Provider details
- NPI number
- 1275528382
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 17614 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
506 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 | 272 | $93 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 97 | $77 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 79 | $138 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 26 | $116 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 17 | $127 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prochlorperazine Maleate | 37 | 26 |
| Prednisone | 25 | 14 |
| Rivaroxabanbrand: Xarelto | 20 | — |
| Apixabanbrand: Eliquis | 19 | — |
| Ondansetron Hcl | 18 | 12 |
| Acyclovir | 12 | — |
| Potassium Chloride | 11 | — |
Practice location
Mailing address
Additional practice locations (3)
- 2610 Uhrmann RdKlamath Falls, OR 97601-1123Phone: (541) 274-4171
- Rapid City Regional Hospital353 Fairmont Blvd.Rapid City, SD 57701Phone: (850) 232-1165
- 2717 Michaelangelo Dr Ste 200Edinburg, TX 78539-1412Phone: (956) 362-2250Fax: (956) 362-2251
Registry dates
- Enumerated
- 2005-09-14
- Last updated
- 2025-03-03
- Certified
- 2025-03-03
Frequently asked questions
- What is Thomas Tan's NPI number?
- Thomas Tan's National Provider Identifier (NPI) is 1275528382, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Tan's specialty?
- Thomas Tan is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Tan located?
- Thomas Tan's practice location on file with NPPES is 400 Medical Plz Ste 100, Lake St Louis, MO 63367-1493.
- What is Thomas Tan's phone number?
- The practice phone number listed in the NPPES registry for Thomas Tan is (636) 639-8600.
- Does Thomas Tan accept Medicare?
- Thomas Tan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Tan's NPI active?
- Yes — Thomas Tan's NPI (1275528382) is active in the NPPES registry as of the last update on 2025-03-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.