Ngan-Lien T. Nguyen, MD
Internal Medicine Physician · Portland, OR
Ngan-Lien T. Nguyen, MD is an internal medicine physician with a practice address in Portland, Oregon, and NPI 1487618724, issued on Apr 13, 2006. Check the license (Oregon MD14448, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Ngan-Lien T. Nguyen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD14448 OR
Self-reported in NPPES; status is on the state search - Practice location
- 10201 SE Main St, Portland, OR 97216
- Phone
- (503) 255-7550
- Enumerated
- Apr 13, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (503) 255-0884
- Medicaid IDs
- 165431 OR
8377194 WA - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,116 in Oregon → Look up another NPI →
Also registered at 10201 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 Ngan-Lien T. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD14448Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average internal medicine physician in 2024
7,372 Medicare Part D claims for 500 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 94 claims were for opioids.
Most prescribed
- Losartan Potassium460 claims
- Amlodipine Besylate380 claims
- Atorvastatin Calcium357 claims
- Levothyroxine Sodium289 claims
- Omeprazole283 claims
- Metformin Hcl256 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.
The MIPS final score for 2023 (Medicare payment program): 97.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Ngan-Lien T. Nguyen among 2,116 internal medicine physician records in Oregon
Ngan-Lien T. Nguyen, 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 fileNo · 58% of these records are
- Record last updated2026 · 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 Ngan-Lien T. Nguyen, MD's NPI number?
Ngan-Lien T. Nguyen, MD's National Provider Identifier (NPI) is 1487618724, issued on Apr 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ngan-Lien T. Nguyen, MD located?
The NPPES record lists a practice address at 10201 SE Main St, Portland, OR, 97216. Phone: (503) 255-7550. Providers update this record themselves, so call before visiting.
How can I verify Ngan-Lien T. Nguyen, MD's license?
NPPES lists Oregon license number MD14448, 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 Ngan-Lien T. Nguyen, MD prescribe under Medicare Part D?
In 2024, Ngan-Lien T. Nguyen, MD had 7,372 Medicare Part D claims for 500 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Ngan-Lien T. Nguyen, MD's MIPS final score?
The 2023 MIPS final score is 97.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.