Gregory Tsai Guffanti, M.D
Family Medicine Physician · Milwaukie, OR
Gregory Tsai Guffanti, M.D is a family medicine physician with a practice address in Milwaukie, Oregon, and NPI 1972820967, issued on Apr 29, 2010. Check the license (Oregon MD161630, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Tsai Guffanti
- Credential
- M.D
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD161630 OR
Self-reported in NPPES; status is on the state search - Practice location
- 10330 SE 32ND Ave, Milwaukie, OR 97222
- Phone
- (503) 416-1960
- Enumerated
- Apr 29, 2010
- Record last updated
- Apr 20, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 500657023 OR
- Medicare enrollment
- Enrolled (PECOS I20130719000517); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Also registered at 10330 SE 32ND Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kimberly Amayao, RNRegistered Nurse1083259717
- Elizabeth Buckley, P.T.Physical Therapist1154772317
- Jessica Burness, MDFamily Medicine Physician1629034152
- Amy Celichowski, PA-CPhysician Assistant1811140080
- Mayanna Dettwyler, COTA/LOccupational Therapy Assistant1457831455
- Lynda DeveryCommunity Health Registered Nurse1295253367
Verify Gregory Tsai Guffanti in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD161630Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% more Medicare Part D claims than the average family medicine physician in 2024
5,565 Medicare Part D claims for 356 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 61 claims were for opioids.
Most prescribed
- Atorvastatin Calcium471 claims
- Amlodipine Besylate270 claims
- Omeprazole205 claims
- Losartan Potassium171 claims
- Metformin Hcl159 claims
- Albuterol Sulfate Hfa156 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Neighborhood Health CenterMilwaukie, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Tsai Guffanti among 2,847 family medicine physician records in Oregon
Gregory Tsai Guffanti, M.D is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 62% of them.
- NPI issued2010 · 62% of these records are older, 35% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2010 · median 2009 among the 1,671 with a school on file
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
50 family medicine physician records list a practice address in Milwaukie
They are 50 of the 1,998 NPPES records with a practice address in Milwaukie, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in Milwaukie → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Sara Becker, MDMilwaukie, OR 972221811970346
- Brenda Brischetto, MDMilwaukie, OR 972221306891742
- Walter Buhl, MDMilwaukie, OR 972221174506604
- Jessica Burness, MDMilwaukie, OR 972221629034152
- Elizabeth Callaghan, MDMilwaukie, OR 972221164405692
- Carl Erickson, D.O.Milwaukie, OR 972221710970876
- William Gillanders, MDMilwaukie, OR 972221134157647
- Elizabeth Klein, MDMilwaukie, OR 972221710916051
Common questions
What is Gregory Tsai Guffanti, M.D's NPI number?
Gregory Tsai Guffanti, M.D's National Provider Identifier (NPI) is 1972820967, issued on Apr 29, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Tsai Guffanti, M.D located?
The NPPES record lists a practice address at 10330 SE 32ND Ave, Milwaukie, OR, 97222. Phone: (503) 416-1960. Providers update this record themselves, so call before visiting.
How can I verify Gregory Tsai Guffanti, M.D's license?
NPPES lists Oregon license number MD161630, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Tsai Guffanti, M.D prescribe under Medicare Part D?
In 2024, Gregory Tsai Guffanti, M.D had 5,565 Medicare Part D claims for 356 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.