MARK NGUYEN MD
NPI 1427348150
Internal Medicine - Nephrology in Portland, OR

Q: What is Mark Nguyen's NPI number?

The NPI number for Mark Nguyen is 1427348150. It was assigned to this individual provider in the NPPES registry on April 14, 2011.

Q: What is Mark Nguyen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Q: When was this NPI record last updated?

The NPPES record for Mark Nguyen was last updated on September 25, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 14, 2011PECOS EnrolledAccepts Medicare Assignment

1130 NW 22ND AVE STE 640, PORTLAND, OR 97210(503) 229-7976(503) 274-4867 Get Directions Write a Review

NPPES record last updated: September 25, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2022, Jun 30, 2021, Jul 24, 2017 (3 updates tracked since 2017).

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About Mark Nguyen Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK NGUYEN MD (NPI 1427348150) is an individual nephrology provider in Portland, Oregon, licensed in Oregon (MD183639) and active in the NPI registry since April 2011. He is enrolled in Medicare PECOS, is affiliated with Legacy Emanuel Medical Center, and is a graduate of Other (2011).

NPPES Registry Identity

NPI1427348150

Entity TypeIndividualMale

Primary Taxonomy207RN0300X

Provider Legal NameMARK NGUYENCredential: MD

Location Address1130 NW 22ND AVE STE 640Portland, OR 97210-2993

Mailing AddressPo Box 3068Portland, OR 97208-3068 · (503) 229-7976 · Fax (503) 274-4867

Phone(503) 229-7976

Fax(503) 274-4867

Sole ProprietorNo

Medical School CMSOtherGraduated 2011

Enumeration DateApril 14, 2011

Last NPPES UpdateSeptember 25, 20253 updates tracked since enumeration

NPPES CertifiedSeptember 25, 2025

✔ NPI 1427348150 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians

Taxonomy Code207RN0300X

Licenses✔ Licensed in OR · MD183639✔ Licensed in WA · MD60742774

Definition

An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.

1130 NW 22ND AVE STE 640, Portland, OR 97210

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, BridgeSpan Health Company, Moda Health Plan, Inc. and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark Nguyen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID547554453

PECOS Enrollment IDI20170623002292

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwest Renal Clinic, Inc.

Same address

Nephrology

1130 NW 22ND AVE STE 640
Portland, OR 97210

Reassigned Medicare billing, Oregon enrollment
31 clinicians in this Medicare group

NPI 1528036662 (503) 229-7976

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

255 services137 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

195 services77 patients

Dialysis services, 4 or more physician visits per month (20 years or older) 90960

Dialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.

123 services22 patients

Hemodialysis procedure with physician evaluation 90935

Hemodialysis is a treatment that uses a machine to filter waste and excess fluid from your blood when your kidneys can't. A physician checks your health before, during, and after the procedure to ensure it's working effectively for you.

104 services57 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

92 services32 patients

Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221

Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.

73 services61 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Legacy Emanuel Medical Center

Acute Care Hospitals · Portland, OR

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380007

Location2801 N Gantenbein AvenuePortland, OR 97227 · Multnomah County

Emergency services Birthing friendly

Ohsu Hospital And Clinics

Acute Care Hospitals · Portland, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number380009

Location3181 SW Sam Jackson Park RoadPortland, OR 97239 · Multnomah County

Emergency services Birthing friendly

Legacy Good Samaritan Medical Center

Acute Care Hospitals · Portland, OR

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number380017

Location1015 NW 22nd Avenue, W121Portland, OR 97210 · Multnomah County

Emergency services Birthing friendly

Providence Hood River Memorial Hospital

Critical Access Hospitals · Hood River, OR

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number381318

Location810 12th StreetHood River, OR 97031 · Hood River County

Emergency services Birthing friendly

Skyline Hospital

Critical Access Hospitals · White Salmon, WA

OwnershipGovernment - Hospital District or Authority

CMS Certification Number501315

Location211 Skyline DriveWhite Salmon, WA 98672 · Klickitat County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97210 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$134.16 typical visit price

range $58.99 – $176.88

Typical copayment $33.54 (range $14.74 – $44.22)

Most-billed visit code 99204

Established Patient

$103.51 typical visit price

range $19.32 – $144.79

Typical copayment $25.87 (range $4.83 – $36.19)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 5

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tacrolimus, immediate release, oral, 1 mg J7507

Treatment-Treatment - Miscellaneous · category RX029N

6 suppliers48 claims8,115 services$0.29 avg. paid by Medicare

Prednisone, immediate release or delayed release, oral, 1 mg J7512

Treatment-Treatment - Miscellaneous · category RX029N

4 suppliers27 claims4,050 services$0.01 avg. paid by Medicare

Mycophenolate mofetil, oral, 250 mg J7517

Treatment-Treatment - Miscellaneous · category RX029N

6 suppliers52 claims7,980 services$0.19 avg. paid by Medicare

Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511

Treatment-Chemotherapy · category RH012N

9 suppliers51 claims51 services$18.92 avg. paid by Medicare

Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period Q0512

Treatment-Chemotherapy · category RH012N

8 suppliers78 claims91 services$12.35 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

LESLIE M STEED MD

Internal Medicine (Nephrology)