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Edit this profileWhere to find Peter K. Sien, MD
- Kennewick location main office
7379 W Deschutes Ave Ste 100, Kennewick, WA 99336 - Phoenix location
625 N 6th St, Phoenix, AZ 85004 - Sequim location
844 N 5th Ave, Sequim, WA 98382 - Modesto location
1316 Nelson Ave, Modesto, CA 95350
About Dr. Sien
Peter K. Sien, MD practices radiation oncology in Kennewick, WA. Peter is a 1975 graduate of Medical College of Wisconsin. According to Medicare claims data, Peter cared for 35 Medicare patients across 60 services. The services billed most often include ct guidance for insertion of radiation therapy fields and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. The provider's National Provider Identifier (NPI) is 1053399568.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (509) 987-1800
- Email not available
Practice Locations
7379 W DESCHUTES AVE STE 100
Kennewick, WA 99336
625 N 6th St
Phoenix, AZ 85004
844 N 5th Ave
Sequim, WA 98382
1316 Nelson Ave
Modesto, CA 95350
Conditions Commonly Evaluated or Treated
Within Radiation Oncology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Benign condition
Blood and lymph cancer
Bone cancer
Brain tumors
Cancer emergencies
Chest cancer
Endocrine cancer
Eye cancer
Eye conditions
Foot conditions
Gastrointestinal cancer
- Anal cancer
- Bile duct cancer
- Colon cancer
- Esophageal cancer
- Gallbladder cancer
- Liver cancer
- Pancreatic cancer
- Stomach cancer
Gynecologic cancer
Head & neck cancer
Head and neck cancer
Metastatic cancer
Neurologic condition
Orthopedic conditions
Sarcoma
Skin cancer
Thoracic cancer
Urologic cancer
Vascular conditions
Procedures & services
Most searched procedures
Advanced radiation
Benign treatment
Brain radiation
Cancer treatment
Central nervous system
Consultation
External radiation
- Electron beam therapy
- Image-guided radiation (IGRT)
- IMRT (Targeted intensity radiation)
- RapidArc / VMAT radiation
- Total body irradiation (TBI)
Eye cancer treatment
Follow-up care
Heart treatments
Internal radiation
Pain and symptom relief
Particle therapy
Precision radiation
- Adaptive radiation therapy
- Heart-sparing breath hold radiation (DIBH)
- Spine radiosurgery
- Stereotactic body radiation (SBRT)
- Stereotactic radiosurgery (SRS)
- Tattoo-free radiation
Prostate cancer treatment
Prostate protection
Radiation therapy
Skin cancer treatment
Skin lymphoma treatment
Specialized radiation
Targeted isotopes
Targeted radiation drugs
Treatment planning
Procedures Most Often Billed to Medicare
60 services · 35 patients · 2 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Ct guidance for insertion of radiation therapy fields | Imaging | 77014 |
37 | Less often than most peers in Radiation Oncology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
23 | Less often than most peers in Radiation Oncology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other radiation oncologists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 2
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other radiation oncologists in Kennewick 6
Same specialty, same city.
More connections — 21 related providers in 3 groups
Trained at Medical College of Wisconsin 8
Other providers in the same specialty who trained at the same institution.
Class of 1975 at Medical College of Wisconsin 8
Providers who graduated from the same medical school in the same year.
Also performs Ct guidance for insertion of radiation therapy fields 5
Providers in WA who bill this service to Medicare most often.
Common questions
What does Dr. Sien specialize in?
Dr. Sien is a radiation oncologist in Kennewick, WA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Radiation Oncology”.
NPI registry
Where is Dr. Sien located?
Dr. Sien is listed at 7379 W Deschutes Ave Ste 100, Kennewick, WA 99336. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Sien's phone number?
The number on file is (509) 987-1800. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Sien's NPI number?
Dr. Sien's National Provider Identifier is 1053399568. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Sien go to medical school?
Dr. Sien attended Medical College of Wisconsin, graduating in 1975. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Sien been practicing?
Dr. Sien has 51 years experience. Calculated from a graduation year of 1975, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Sien do most often?
According to Medicare billing data, Dr. Sien performs imaging including ct guidance for insertion of radiation therapy fields, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Sien confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Sien. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.