Nancy Formosan Tsai, MD
Internal Medicine Physician · Portland, OR
Nancy Formosan Tsai, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1447388442, issued on Mar 1, 2007. Check the license (Oregon MD27242, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Nancy Formosan Tsai
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD27242 OR
Self-reported in NPPES; status is on the state search - Practice location
- 10000 SE Main St, Portland, OR 97216
- Phone
- (503) 261-6985
- Enumerated
- Mar 1, 2007
- Record last updated
- Dec 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (503) 261-6790
- Medicare enrollment
- Enrolled (PECOS I20070420000272); 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 10000 SE Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nancy Formosan Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD27242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average internal medicine physician in 2024
917 Medicare Part D claims for 234 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 30 claims were for opioids.
Most prescribed
- Atorvastatin Calcium53 claims
- Clopidogrel42 claims
- Potassium Chloride38 claims
- Losartan Potassium36 claims
- Metoprolol Succinate34 claims
- Metoprolol Tartrate27 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.
Industry payments in 2024: $26.92
1 payment: food and beverage; the largest payer was Dompe US, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The NorthwestPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy Formosan Tsai among 2,116 internal medicine physician records in Oregon
Nancy Formosan Tsai, 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 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1997 · median 2008 among the 1,232 with a school on file
- Record last updated2008 · 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
- Peter Carty, MDPortland, OR 972161326004250
- Ellen Duplain, MDPortland, OR 972161225066301
- Elizabeth Ehrlich, MDPortland, OR 972161609069681
- Craig Foss, MDPortland, OR 972161720044654
- Jill Hansen, MDPortland, OR 972161518050459
- Philip McDaniel, M.D.Portland, OR 972161851327753
- Richard Mishler, MDPortland, OR 972161609832161
- Marc Moroye, MDPortland, OR 972161285698514
Common questions
What is Nancy Formosan Tsai, MD's NPI number?
Nancy Formosan Tsai, MD's National Provider Identifier (NPI) is 1447388442, issued on Mar 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy Formosan Tsai, MD located?
The NPPES record lists a practice address at 10000 SE Main St, Portland, OR, 97216. Phone: (503) 261-6985. Providers update this record themselves, so call before visiting.
How can I verify Nancy Formosan Tsai, MD's license?
NPPES lists Oregon license number MD27242, 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 Nancy Formosan Tsai, MD prescribe under Medicare Part D?
In 2024, Nancy Formosan Tsai, MD had 917 Medicare Part D claims for 234 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.