Peter Sien, MD
NPI 1053399568 · Radiation Oncology Physician · Kennewick, WA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Sien, MD is a Radiation Oncology Physician provider in Kennewick, WA (NPI 1053399568).
Provider details
- NPI number
- 1053399568
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD60698178 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
60 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 37 | $114 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 23 | $100 |
Typical Medicare-allowed amounts for these services range $100–$114 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (3)
- 625 N 6th StPhoenix, AZ 85004-2155Phone: (602) 406-8222
- 1316 Nelson AveModesto, CA 95350-5341Phone: (209) 575-5870Fax: (209) 575-5875
- 844 N 5th AveSequim, WA 98382-3045Phone: (360) 683-9895Fax: (360) 582-5614
Registry dates
- Enumerated
- 2006-01-04
- Last updated
- 2026-01-05
- Certified
- 2026-01-05
Frequently asked questions
- What is Peter Sien's NPI number?
- Peter Sien's National Provider Identifier (NPI) is 1053399568, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Sien's specialty?
- Peter Sien is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Peter Sien located?
- Peter Sien's practice location on file with NPPES is 7379 W Deschutes Ave Ste 100, Kennewick, WA 99336-7900.
- What is Peter Sien's phone number?
- The practice phone number listed in the NPPES registry for Peter Sien is (509) 987-1800.
- Does Peter Sien accept Medicare?
- Peter Sien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Sien's NPI active?
- Yes — Peter Sien's NPI (1053399568) is active in the NPPES registry as of the last update on 2026-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.