John Tao-Fan Chen, MD
Internal Medicine Physician · Portland, OR
John Tao-Fan Chen, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1154437945, issued on Aug 22, 2006. Check the license (Oregon MD17764, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Tao-Fan Chen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD17764 OR
Self-reported in NPPES; status is on the state search - Practice location
- 3550 N Interstate Ave, Portland, OR 97227
- Phone
- (503) 285-9321
- Enumerated
- Aug 22, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071231000359); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Also registered at 3550 N Interstate Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Brad Anderson, M.D.Addiction Medicine (Family Medicine) Physician1245323724
- Brenda Annotti, F.N.P.Gerontology Registered Nurse1255335295
Verify John Tao-Fan Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD17764Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
80 Medicare Part D claims for 42 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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
- Kaiser Foundation Health Plan OF The NorthwestClackamas, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Tao-Fan Chen among 2,116 internal medicine physician records in Oregon
John Tao-Fan Chen, MD is one of 2,116 internal medicine physician records with a practice address in Oregon. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 54% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1986 · median 2008 among the 1,232 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
889 internal medicine physician records list a practice address in Portland
They are 889 of the 42,088 NPPES records with a practice address in Portland, and 2,116 internal medicine physician records in Oregon.
All 2,116 in Oregon → Every provider in Portland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Douglas Beers, MDPortland, OR 972271720055197
- Denise Bilbao, M.D.Portland, OR 972271538173943
- Duane Burroughs, MDPortland, OR 972271134197213
- Smitha Chadaga, MDPortland, OR 972271952362295
- Darcy Deering, M.D.Portland, OR 972271205801065
- Lori Farrell, M.D.Portland, OR 972271235103987
- Elise Fulsang, MDPortland, OR 972271952305385
- Ameet Jhooty, M.DPortland, OR 972271295795938
Common questions
What is John Tao-Fan Chen, MD's NPI number?
John Tao-Fan Chen, MD's National Provider Identifier (NPI) is 1154437945, issued on Aug 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Tao-Fan Chen, MD located?
The NPPES record lists a practice address at 3550 N Interstate Ave, Portland, OR, 97227. Phone: (503) 285-9321. Providers update this record themselves, so call before visiting.
How can I verify John Tao-Fan Chen, MD's license?
NPPES lists Oregon license number MD17764, 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 John Tao-Fan Chen, MD prescribe under Medicare Part D?
In 2024, John Tao-Fan Chen, MD had 80 Medicare Part D claims for 42 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.