John Williamson, M.D.
NPI 1083732176 · Diagnostic Radiology Physician · Austin, TX
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Williamson, M.D. is a Diagnostic Radiology Physician provider in Austin, TX (NPI 1083732176).
Provider details
- NPI number
- 1083732176
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- N3389 (TX)
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
19 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
2,756 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 1,004 | $8 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 150 | $84 |
| Ct Scan of Blood Vessels of Chest With Contrast71275 | 125 | $82 |
| X-Ray of Chest, 2 Views71046 | 92 | $10 |
| Ct Scan of Chest Without Contrast71250 | 87 | $49 |
| Review By Radiologist of Ct Guidance for Needle Placement77012 | 87 | $67 |
| X-Ray of Abdomen, 1 View |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$492 across 8 records (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
- 2007-03-27
- Last updated
- 2018-03-15
Frequently asked questions
- What is John Williamson's NPI number?
- John Williamson's National Provider Identifier (NPI) is 1083732176, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Williamson's specialty?
- John Williamson is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Williamson located?
- John Williamson's practice location on file with NPPES is 12554 Riata Vista Cir, Austin, TX 78727-6431.
- What is John Williamson's phone number?
- The practice phone number listed in the NPPES registry for John Williamson is (512) 795-5100.
- Does John Williamson accept Medicare?
- John Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Williamson's NPI active?
- Yes — John Williamson's NPI (1083732176) is active in the NPPES registry as of the last update on 2018-03-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.