Physician Profile
Unclaimed ProfileAbout WILLIS
Gregory S Willis, M.D. practices radiation oncology in Tualatin, OR. Gregory is a 1999 graduate of Oregon Health Sciences University School of Medicine. According to Medicare claims data, Gregory cared for 255 Medicare patients across 666 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (503) 692-4843
- Email not available
Practice Locations
6489 SW BORLAND RD
Tualatin, OR 97062
Procedures Most Often Billed to Medicare
666 services · 255 patients · 10 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Ct guidance for insertion of radiation therapy fields | Imaging | 77014 |
224 |
| Calculation of radiation therapy dose | Imaging | 77300 |
93 |
| Design and construction of complex radiation treatment device | Imaging | 77334 |
81 |
| Radiation treatment management, 5 treatment sessions | Imaging | 77427 |
78 |
| Complex radiation therapy planning | Imaging | 77263 |
20 |
| Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved | Imaging | 77290 |
12 |
| High precision radiation therapy planning | Imaging | 77301 |
11 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
106 |
| 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 |
26 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
15 |
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.
Also at this address 3
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Oregon Health Sciences University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1999 at Oregon Health Sciences University School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Ct guidance for insertion of radiation therapy fields 8
Providers in OR who bill this service to Medicare most often.
Common questions
What is Dr. Willis's specialty?
Dr. Willis is a radiation oncology in Tualatin, OR. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “RADIATION ONCOLOGY”.
NPI registry
Where can I find Dr. Willis?
Dr. Willis is listed at 6489 SW BORLAND RD, Tualatin, OR 97062. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Willis?
The number on file is (503) 692-4843. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Willis's NPI number?
Dr. Willis's National Provider Identifier is 1417941600. 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
What is Dr. Willis's medical education?
Dr. Willis attended Oregon Health Sciences University School of Medicine, graduating in 1999. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Willis been practicing?
Dr. Willis has 27 years experience. Calculated from a graduation year of 1999, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Willis known for?
According to Medicare billing data, Dr. Willis performs imaging including ct guidance for insertion of radiation therapy fields and calculation of radiation therapy dose, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Willis confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Willis. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.