Thomas Williamson, MD
NPI 1295774461 · Internal Medicine Physician · Huron, OH
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Williamson, MD is a Internal Medicine Physician provider in Huron, OH (NPI 1295774461).
Provider details
- NPI number
- 1295774461
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35-04-3844-W (OH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,631 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 320 | $65 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 307 | $83 |
| Blood Test, Clotting Time85610 | 293 | $4 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 284 | $11 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 176 | $47 |
| Hemoglobin A1c Level83036 | 147 | $10 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 106 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 298 | 80 |
| Amlodipine Besylate | 294 | 77 |
| Levothyroxine Sodium | 291 | 71 |
| Metformin Hcl | 267 | 68 |
| Omeprazole | 264 | 64 |
| Lisinopril | 254 | 67 |
| Hydrochlorothiazide | 243 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$13 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-05
- Last updated
- 2012-09-11
Frequently asked questions
- What is Thomas Williamson's NPI number?
- Thomas Williamson's National Provider Identifier (NPI) is 1295774461, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Williamson's specialty?
- Thomas Williamson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Williamson located?
- Thomas Williamson's practice location on file with NPPES is 300 Williams St, Huron, OH 44839-1648.
- What is Thomas Williamson's phone number?
- The practice phone number listed in the NPPES registry for Thomas Williamson is (419) 433-5222.
- Does Thomas Williamson accept Medicare?
- Thomas Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Williamson's NPI active?
- Yes — Thomas Williamson's NPI (1295774461) is active in the NPPES registry as of the last update on 2012-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.