William Grizos, MD
NPI 1811910854 · Radiation Oncology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grizos, MD is a Radiation Oncology Physician provider in Philadelphia, PA (NPI 1811910854).
Provider details
- NPI number
- 1811910854
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD-027845-E (PA)
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
256 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 Guidance for Insertion of Radiation Therapy Fields77014 | 106 | $45 |
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 67 | $21 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 25 | $195 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 22 | $193 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 19 | $35 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 17 | $37 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$38 across 2 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
- 2006-07-25
- Last updated
- 2012-09-26
Frequently asked questions
- What is William Grizos's NPI number?
- William Grizos's National Provider Identifier (NPI) is 1811910854, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grizos's specialty?
- William Grizos is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Grizos located?
- William Grizos's practice location on file with NPPES is 8835 Germantown Ave., Philadelphia, PA 19118-2718.
- What is William Grizos's phone number?
- The practice phone number listed in the NPPES registry for William Grizos is (215) 242-1100.
- Does William Grizos accept Medicare?
- William Grizos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grizos's NPI active?
- Yes — William Grizos's NPI (1811910854) is active in the NPPES registry as of the last update on 2012-09-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.