Ralph Ermoian, MD
NPI 1588795140 · Radiation Oncology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Ermoian, MD is a Radiation Oncology Physician provider in Seattle, WA (NPI 1588795140).
Provider details
- NPI number
- 1588795140
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD60041447 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
566 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 452 | $23 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 100 | $50 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 14 | $213 |
Typical Medicare-allowed amounts for these services range $23–$213 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-07
- Last updated
- 2011-05-31
Frequently asked questions
- What is Ralph Ermoian's NPI number?
- Ralph Ermoian's National Provider Identifier (NPI) is 1588795140, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Ermoian's specialty?
- Ralph Ermoian is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Ermoian located?
- Ralph Ermoian's practice location on file with NPPES is 1959 Ne Pacific St, Seattle, WA 98195-6043.
- What is Ralph Ermoian's phone number?
- The practice phone number listed in the NPPES registry for Ralph Ermoian is (206) 598-4100.
- Does Ralph Ermoian accept Medicare?
- Ralph Ermoian is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Ermoian's NPI active?
- Yes — Ralph Ermoian's NPI (1588795140) is active in the NPPES registry as of the last update on 2011-05-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.