CASEY WILLIAMSON M.D.
NPI 1437683570
Radiology - Radiation Oncology in Portland, OR
About Casey Williamson M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CASEY WILLIAMSON M.D. (NPI 1437683570) is an individual radiation oncology provider in Portland, Oregon, licensed in Oregon (MD209995) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Ohsu Hospital And Clinics, and is a graduate of University Of California, San Diego School Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses 2
Accepted 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
Casey Williamson M.d. 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.
Medicare Billing Reassignments
2Medicare enrollment records show Casey Williamson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Portland, OR 97239
- Reassigned Medicare billing, Oregon enrollment
- 2,212 clinicians in this Medicare group
Hillsboro, OR 97123
- Reassigned Medicare billing, Oregon enrollment
- 691 clinicians in this Medicare group
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 13
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ohsu Hospital And Clinics
Acute Care Hospitals · Portland, ORSalem Hospital
Acute Care Hospitals · Salem, ORPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97239 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
PORTLAND, OR 97239
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 Casey Williamson's NPI number?
The NPI number for Casey Williamson is 1437683570. It was assigned to this individual provider in the NPPES registry on April 15, 2017.
Where is Casey Williamson located?
Casey Williamson practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (818) 364-1555.
What is Casey Williamson's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Casey Williamson enrolled in Medicare?
Yes. Casey Williamson 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 organizations bill Medicare for Casey Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Casey Williamson reassigns Medicare benefits to 2 organizations: University Professional Services (Portland, OR) and Tuality Medical Group LLC (Hillsboro, OR). Each 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 Casey Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Casey Williamson accept?
Health plans from Moda Health Plan, Inc. and PacificSource Health Plans list Casey Williamson 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 Casey Williamson affiliated with any hospitals?
According to CMS data, Casey Williamson is affiliated with Ohsu Hospital And Clinics and Salem Hospital.
When was this NPI record last updated?
The NPPES record for Casey Williamson was last updated on November 29, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Casey Williamson, M.D. · NPI 1437683570
Radiation Oncology physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since April 15, 2017.
## Identity
- **NPI:** 1437683570 (Entity type: Individual)
- **Enumerated:** April 15, 2017
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **State license:** MD209995 (Oregon)
- **Sole proprietor:** No
## Practice location
- **Address:** 3181 SW SAM JACKSON PARK RD, Portland, OR 97239-3011
- **Phone:** (818) 364-1555
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): University Professional Services (NPI 1376709535, Portland, OR); Tuality Medical Group LLC (NPI 1639690704, Hillsboro, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** November 29, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1437683570) · Data from the CMS NPPES public registry.