Mark Nguyen, MD
Nephrology Physician · Portland, OR
Mark Nguyen, MD is a nephrology physician with a practice address in Portland, Oregon, and NPI 1427348150, issued on Apr 14, 2011. Check the license (Oregon MD183639, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark Nguyen
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License numbers
- MD183639 OR
MD60742774 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1130 NW 22ND Ave Ste 640, Portland, OR 97210
- Phone
- (503) 229-7976
- Enumerated
- Apr 14, 2011
- Record last updated
- Sep 25, 2025
- Fax
- (503) 274-4867
- Medicare enrollment
- Enrolled (PECOS I20170623002292); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 136 in Oregon → Look up another NPI →
Also registered at 1130 NW 22ND Ave Ste 640
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Chelsea Clark, FNPFamily Nurse Practitioner1083446256
- Alexander Hawkins, MDNephrology Physician1770016198
- Ajay Pradhan, DONephrology Physician1619555612
- Leslie Steed, MDNephrology Physician1043288129
Verify Mark Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD183639Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average nephrology physician in 2024
1,774 Medicare Part D claims for 353 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate132 claims
- Losartan Potassium116 claims
- Jardiance99 claims
- Lisinopril78 claims
- Furosemide67 claims
- Carvedilol62 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: $108.58
6 payments; by number, the most common kind was food and beverage; the largest payer was Otsuka America Pharmaceutical, Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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
- Northwest Renal Clinic IncPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Nguyen among 136 nephrology physician records in Oregon
Mark Nguyen, MD is one of 136 nephrology physician records with a practice address in Oregon. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 73% of them.
- NPI issued2011 · 73% of these records are older, 22% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2011 · median 2003 among the 92 with a school on file
- Record last updated2025 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Oregon
There are 136 nephrology physician records in Oregon.
All 136 in Oregon → Every provider in Portland → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- William Bennett, MDPortland, OR 972101457320525
- Hem Deodhar, MDPortland, OR 972101497723555
- Alexander Hawkins, MDPortland, OR 972101770016198
- Thuy Le, MDPortland, OR 972101578859849
- Ajay Pradhan, DOPortland, OR 972101619555612
- Clayton Smiley, MDPortland, OR 972101679544431
- Leslie Steed, MDPortland, OR 972101043288129
- Julia Tank, MDPortland, OR 972101114995297
Common questions
What is Mark Nguyen, MD's NPI number?
Mark Nguyen, MD's National Provider Identifier (NPI) is 1427348150, issued on Apr 14, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Mark Nguyen, MD located?
The NPPES record lists a practice address at 1130 NW 22ND Ave Ste 640, Portland, OR, 97210. Phone: (503) 229-7976. Providers update this record themselves, so call before visiting.
How can I verify Mark Nguyen, MD's license?
NPPES lists Oregon license number MD183639, 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 Mark Nguyen, MD prescribe under Medicare Part D?
In 2024, Mark Nguyen, MD had 1,774 Medicare Part D claims for 353 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.