Richard Z. Tsai, MD
Internal Medicine Physician · Portland, OR
Richard Z. Tsai, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1558387555, issued on Jul 14, 2006. Check the license (Oregon MD22952, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Richard Z. Tsai
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD22952 OR
Self-reported in NPPES; status is on the state search - Practice location
- 417 SW 117TH Ave, Portland, OR 97225
- Phone
- (503) 216-9400
- Enumerated
- Jul 14, 2006
- Record last updated
- Mar 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (503) 216-9499
- Medicaid ID
- 287641 OR
- Medicare enrollment
- Enrolled (PECOS I20100420000903); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Also registered at 417 SW 117TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dianne Eardley, MDInternal Medicine Physician1740210434
Verify Richard Z. Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD22952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average internal medicine physician in 2024
8,140 Medicare Part D claims for 618 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 377 claims were for opioids.
Most prescribed
- Atorvastatin Calcium742 claims
- Amlodipine Besylate350 claims
- Levothyroxine Sodium346 claims
- Lisinopril255 claims
- Tamsulosin Hcl222 claims
- Losartan Potassium207 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
- Providence Health And Services OregonPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Richard Z. Tsai among 2,116 internal medicine physician records in Oregon
Richard Z. 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 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
- Graduated1998 · median 2008 among the 1,232 with a school on file
- Record last updated2021 · 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
- Myrna Casono, MDPortland, OR 972251588666432
- Timothy Cleary, M.D.Portland, OR 972251215933411
- Cynthia Ferrier, M.D.Portland, OR 972251285607440
- Robert Fojtasek, MDPortland, OR 972251306888649
- Steven Gordon, MDPortland, OR 972251285616748
- Thomas Gragnola, MDPortland, OR 972251144220765
- Janette Green, M.D.Portland, OR 972251225029986
- Charles Kilo, M.D.Portland, OR 972251801869078
Common questions
What is Richard Z. Tsai, MD's NPI number?
Richard Z. Tsai, MD's National Provider Identifier (NPI) is 1558387555, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Richard Z. Tsai, MD located?
The NPPES record lists a practice address at 417 SW 117TH Ave, Portland, OR, 97225. Phone: (503) 216-9400. Providers update this record themselves, so call before visiting.
How can I verify Richard Z. Tsai, MD's license?
NPPES lists Oregon license number MD22952, 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 Richard Z. Tsai, MD prescribe under Medicare Part D?
In 2024, Richard Z. Tsai, MD had 8,140 Medicare Part D claims for 618 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.