DR. DIANE C. TSAI M.D.
NPI 1730266966
Radiology - Radiation Oncology in Portland, OR
About Dr. Diane C. Tsai M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DIANE C. TSAI M.D. (NPI 1730266966) is an individual radiation oncology provider in Portland, Oregon, licensed in Oregon (MD174455) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS, is affiliated with Columbia Memorial Hospital, and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Diane C. Tsai 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.
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Columbia Memorial Hospital
Critical Access Hospitals · Astoria, ORProvidence St Mary Medical Center
Acute Care Hospitals · Walla Walla, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97227 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTLAND, OR 97227
PORTLAND, OR 97227
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 Diane Tsai's NPI number?
The NPI number for Diane Tsai is 1730266966. It was assigned to this individual provider in the NPPES registry on November 1, 2006.
Where is Diane Tsai located?
Diane Tsai practices at 3620 N Interstate Ave, Portland, OR 97227. The listed phone number is (503) 813-2000.
What is Diane Tsai's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Diane Tsai enrolled in Medicare?
Yes. Diane Tsai 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.
What insurance does Diane Tsai accept?
Health plans from BridgeSpan Health Company, Kaiser Permanente, Moda Health Plan, Inc., PacificSource Health Plans and Premera Blue Cross Blue Shield of Alaska and 2 other insurers list Diane Tsai 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 Diane Tsai affiliated with any hospitals?
According to CMS data, Diane Tsai is affiliated with Columbia Memorial Hospital and Providence St Mary Medical Center.
When was this NPI record last updated?
The NPPES record for Diane Tsai was last updated on December 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months 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.