DR. RALPH PHILIP ERMOIAN MD
NPI 1588795140
Radiology - Radiation Oncology in Seattle, WA
About Dr. Ralph Philip Ermoian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. RALPH PHILIP ERMOIAN MD (NPI 1588795140) is an individual radiation oncology provider in Seattle, Washington, licensed in Washington (MD60041447) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS, is affiliated with University Of Washington Medical Ctr, and is a graduate of University Of California, San Francisco School Of Medicine (2003).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Ralph Philip Ermoian 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.
Medicare Billing Reassignments
2Medicare enrollment records show Ralph Ermoian reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98105
- Reassigned Medicare billing, Washington enrollment
- 1,443 clinicians in this Medicare group
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 4,364 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Washington Medical Ctr
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98195 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.
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
SEATTLE, WA 98195
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 Ralph Ermoian's NPI number?
The NPI number for Ralph Ermoian is 1588795140. It was assigned to this individual provider in the NPPES registry on March 7, 2007.
Where is Ralph Ermoian located?
Ralph Ermoian practices at 1959 NE Pacific St, Seattle, WA 98195. The listed phone number is (206) 598-4100.
What is Ralph Ermoian's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Ralph Ermoian enrolled in Medicare?
Yes. Ralph Ermoian 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 Ralph Ermoian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ralph Ermoian reassigns Medicare benefits to 2 organizations: The Association Of Chrmc And University Physicians (Seattle, WA) and The Association Of University Physicians (Seattle, WA). 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 Ralph Ermoian's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ralph Ermoian accept?
Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Ralph Ermoian 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 Ralph Ermoian affiliated with any hospitals?
According to CMS data, Ralph Ermoian is affiliated with University Of Washington Medical Ctr.
When was this NPI record last updated?
The NPPES record for Ralph Ermoian was last updated on May 31, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Dr. Ralph Philip Ermoian, MD · NPI 1588795140
Radiation Oncology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since March 7, 2007.
## Identity
- **NPI:** 1588795140 (Entity type: Individual)
- **Enumerated:** March 7, 2007
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **State license:** MD60041447 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1959 NE PACIFIC ST, Seattle, WA 98195-6043
- **Phone:** (206) 598-4100 · **Fax:** (206) 598-3786
## 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): The Association Of Chrmc And University Physicians (NPI 1255449963, Seattle, WA); The Association Of University Physicians (NPI 1023041159, Seattle, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 2003
## Record status
- **NPPES last updated:** May 31, 2011
---
Source: [NPI Profile](https://npiprofile.com/npi/1588795140) · Data from the CMS NPPES public registry.