1. Home
  2. Directory
  3. Pennsylvania
  4. Philadelphia
  5. Radiology
  6. NPI Profile

WILLIAM T GRIZOS MD
NPI 1811910854
Radiology - Radiation Oncology in Philadelphia, PA

Active since July 25, 2006PECOS EnrolledAccepts Medicare Assignment
8835 GERMANTOWN AVE., PHILADELPHIA, PA 19118(215) 242-1100(215) 242-1101 Get Directions Write a Review

NPPES record last updated: September 26, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About William T Grizos Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM T GRIZOS MD (NPI 1811910854) is an individual radiation oncology provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (MD-027845-E) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Hospital Of Univ Of Pennsylvania, and is a graduate of Jefferson Medical College Of Thomas Jefferson University (1981).

NPPES Registry Identity

NPI1811910854
Entity TypeIndividualMale
Primary Taxonomy2085R0001X
Provider Legal NameWILLIAM T GRIZOSCredential: MD
Location Address8835 GERMANTOWN AVE.Philadelphia, PA 19118-2718
Mailing Address8835 Germantown Ave.Philadelphia, PA 19118-2718 · (215) 242-1100 · Fax (215) 242-1101
Phone(215) 242-1100
Fax(215) 242-1101
Sole ProprietorNo
Medical School CMSJefferson Medical College Of Thomas Jefferson UniversityGraduated 1981
Enumeration DateJuly 25, 2006
Last NPPES UpdateSeptember 26, 2012
✔ NPI 1811910854 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0001X
License✔ Licensed in PA · MD-027845-E
Definition
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
8835 GERMANTOWN AVE., Philadelphia, PA 19118
Open in Google Maps ↗

Other Identifiers 3

Medicaid001147375PA
Medicaid7972601NJ
Medicare PIN541960PA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William T Grizos Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6608832225
PECOS Enrollment IDI20041206000876
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show William Grizos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Penn-Medical Group
8.5 mi
Reproductive Endocrinology
3701 MARKET ST, 8TH FLOOR
Philadelphia, PA 19104
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 3,488 clinicians in this Medicare group
NPI 1245628353 (215) 662-6100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Ct guidance for insertion of radiation therapy fields 77014
CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.
106 services74 patients
Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy G6002
Stereoscopic x-ray guidance is a technique used in radiation therapy. It involves taking multiple X-ray images from different angles to create a 3D picture of the area to be treated. This helps accurately pinpoint the exact location for radiation delivery, ensuring the therapy is as effective as possible.
67 services26 patients
Radiation treatment management, 5 treatment sessions 77427
Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.
25 services24 patients
Radiation treatment management, 5 treatment sessions 77427
Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.
22 services15 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
19 services18 patients
Ct guidance for insertion of radiation therapy fields 77014
CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.
17 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Hospital Of Univ Of Pennsylvania

Acute Care Hospitals · Philadelphia, PA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390111
Location34th & Spruce StsPhiladelphia, PA 19104 · Philadelphia County
Emergency services Birthing friendly

Chester County Hospital

Acute Care Hospitals · West Chester, PA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390179
Location701 East Marshall StreetWest Chester, PA 19380 · Chester County
Emergency services Birthing friendly

Doylestown Hospital

Acute Care Hospitals · Doylestown, PA
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number390203
Location595 West State StDoylestown, PA 18901 · Bucks County
Emergency services Birthing friendly

Penn Presbyterian Medical Center

Acute Care Hospitals · Philadelphia, PA
5/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number390223
Location51 North 39th StreetPhiladelphia, PA 19104 · Philadelphia County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 19118 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$180.99 typical visit price
range $59.88 – $180.99
Typical copayment $45.24 (range $14.97 – $45.24)
Most-billed visit code 99205
Established Patient
$74.47 typical visit price
range $19.30 – $147.29
Typical copayment $18.61 (range $4.82 – $36.82)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Grizos's NPI number?

The NPI number for William Grizos is 1811910854. It was assigned to this individual provider in the NPPES registry on July 25, 2006.

Where is William Grizos located?

William Grizos practices at 8835 Germantown Ave., Philadelphia, PA 19118. The listed phone number is (215) 242-1100.

What is William Grizos's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Is William Grizos enrolled in Medicare?

Yes. William Grizos is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for William Grizos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Grizos reassigns Medicare benefits to University Of Penn-Medical Group (Philadelphia, PA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Grizos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Grizos accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list William Grizos as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Grizos affiliated with any hospitals?

According to CMS data, William Grizos is affiliated with Hospital Of Univ Of Pennsylvania, Chester County Hospital, Doylestown Hospital and Penn Presbyterian Medical Center.

When was this NPI record last updated?

The NPPES record for William Grizos was last updated on September 26, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.