Geoffrey Mcwilliams, D.O.
NPI 1538589684 · Diagnostic Radiology Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Geoffrey Mcwilliams, D.O. is a Diagnostic Radiology Physician provider in Sacramento, CA (NPI 1538589684).
Provider details
- NPI number
- 1538589684
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 14774 (CA)
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
12 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
1,459 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) |
|---|---|---|
| Ct Scan Head Or Brain Without Contrast70450 | 290 | $37 |
| X-Ray of Chest, 1 View71045 | 242 | $8 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 136 | $81 |
| Ct Scan of Upper Spine Without Contrast72125 | 134 | $44 |
| Ct Scan of Blood Vessels of Chest With Contrast71275 | 106 | $81 |
| Ct Scan of Abdomen and Pelvis Without Contrast74176 | 55 | $78 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$121 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
- 2014-04-16
- Last updated
- 2019-08-20
Frequently asked questions
- What is Geoffrey Mcwilliams's NPI number?
- Geoffrey Mcwilliams's National Provider Identifier (NPI) is 1538589684, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Geoffrey Mcwilliams's specialty?
- Geoffrey Mcwilliams is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Geoffrey Mcwilliams located?
- Geoffrey Mcwilliams's practice location on file with NPPES is 4860 Y St Ste 3100, Sacramento, CA 95817-2307.
- What is Geoffrey Mcwilliams's phone number?
- The practice phone number listed in the NPPES registry for Geoffrey Mcwilliams is (916) 703-2273.
- Does Geoffrey Mcwilliams accept Medicare?
- Geoffrey Mcwilliams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Geoffrey Mcwilliams's NPI active?
- Yes — Geoffrey Mcwilliams's NPI (1538589684) is active in the NPPES registry as of the last update on 2019-08-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.