Physician Profile
Diane C. Tsai, M.D.
Unclaimed ProfileAbout Dr. Tsai
Diane C. Tsai, M.D. is a healthcare provider in Portland, OR specializing in radiation oncology. According to Medicare claims data, Diane cared for 97 Medicare patients across 223 services. The services billed most often include continuing radiation therapy consultation per week, radiation treatment management, 5 treatment sessions, and prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
- (503) 813-2000
- Email not available
Practice Locations
3620 N INTERSTATE AVE
Portland, OR 97227
1900 NW Myhre Rd
Silverdale, WA 98383
3301 Squalicum Pkwy
Bellingham, WA 98225
2000 Hospital Dr
Sedro Woolley, WA 98284
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
223 services · 97 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Continuing radiation therapy consultation per week | Imaging | 77336 |
68 | Less often than most peers in Radiation Oncology |
| Radiation treatment management, 5 treatment sessions | Imaging | 77427 |
63 | Less often than most peers in Radiation Oncology |
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | Billing code | G2212 |
27 | As often as other peers in Radiation Oncology |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
27 | Less often than most peers in Radiation Oncology |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
24 | As often as other peers in Radiation Oncology |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
14 | 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 4
Same specialty, same street address — most likely the same department or group.
Also at this address 4
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 Portland 5
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Continuing radiation therapy consultation per week 8
Providers in OR who bill this service to Medicare most often.
Common questions
What does Diane C. Tsai specialize in?
Diane C. Tsai is a radiation oncologist in Portland, OR. That is the designation recorded for this NPI in the federal registry, where it is listed as “Radiation Oncology”.
NPI registry
Where is Diane C. Tsai located?
Diane C. Tsai is listed at 3620 N Interstate Ave, Portland, OR 97227. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Diane C. Tsai's phone number?
The number on file is (503) 813-2000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Diane C. Tsai's NPI number?
Diane C. Tsai's National Provider Identifier is 1730266966. 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 Diane C. Tsai train?
Diane C. Tsai attended Other, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How long has Diane C. Tsai been practicing?
Diane C. Tsai has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What does Diane C. Tsai do most often?
According to Medicare billing data, Diane C. Tsai performs imaging including continuing radiation therapy consultation per week and radiation treatment management, 5 treatment sessions, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Diane C. Tsai confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Diane C. Tsai. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.