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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MATTHEW NGUYEN M.D.
NPI 1669039079
Internal Medicine - Medical Oncology in Los Angeles, CA

Active since May 21, 2019PECOS Enrolled
127 S SAN VICENTE BLVD FL 7, LOS ANGELES, CA 90048(310) 423-8030(310) 659-3928 Get Directions Write a Review

NPPES record last updated: October 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 16, 2026, Jun 8, 2023, May 21, 2019 (3 updates tracked since 2019).

About Matthew Nguyen M.d. NPPES

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

MATTHEW NGUYEN M.D. (NPI 1669039079) is an individual medical oncology provider in Los Angeles, California, licensed in California (A209721) and active in the NPI registry since May 2019. He is enrolled in Medicare PECOS and maintains a secondary practice location in West Hollywood.

NPPES Registry Identity

NPI1669039079
Entity TypeIndividualMale
Primary Taxonomy207RX0202X
Provider Legal NameMATTHEW NGUYENCredential: M.D.
Location Address127 S SAN VICENTE BLVD FL 7Los Angeles, CA 90048-3311
Mailing Address4140 W 190th StTorrance, CA 90504-5513
Phone(310) 423-8030
Fax(310) 659-3928
Sole ProprietorNo
Enumeration DateMay 21, 2019
Last NPPES UpdateOctober 16, 20263 updates tracked since enumeration
NPPES CertifiedOctober 16, 2026
✔ NPI 1669039079 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in CA · A209721
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
127 S SAN VICENTE BLVD FL 7, Los Angeles, CA 90048
Open in Google Maps ↗

Secondary Practice Location 1

Location 18700 Beverly BlvdWest Hollywood, CA 90048-1804 · Phone (310) 423-8030

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Matthew Nguyen M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Matthew Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

St Clair Professional Services Inc
2,140 mi
Critical Care Medicine
1000 BOWER HILL RD
Pittsburgh, PA 15243
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 133 clinicians in this Medicare group
NPI 1326712050 (412) 942-4000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90048 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
$187.60 typical visit price
range $62.96 – $187.60
Typical copayment $46.90 (range $15.74 – $46.90)
Most-billed visit code 99205
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Other Providers at the Same Location NPPES 20

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

JASON EARL CHAN M.D. PH.D.
Internal Medicine (Hematology & Oncology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-8530
DR. NATSAI CHARLENE NYAKUDARIKA M.D.
Obstetrics & Gynecology (Gynecologic Oncology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-5800
DR. NICHOLAS N NISSEN M.D.
Surgery (Surgical Critical Care)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-6746
MR. ALESSIO PIGAZZI M.D.
Colon & Rectal Surgery
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-5874
MARC ATTIYEH
Surgery (Surgical Oncology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-6746
COYIN OH
Internal Medicine (Medical Oncology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-8030
LAWRENCE WAYNE LIU MD
Internal Medicine (Medical Oncology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-1160
HITOMI HOSOYA MD
Internal Medicine (Hematology)
127 S SAN VICENTE BLVD FL 7
LOS ANGELES, CA 90048
Los Angeles County (310) 423-1160

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Matthew Nguyen's NPI number?

The NPI number for Matthew Nguyen is 1669039079. It was assigned to this individual provider in the NPPES registry on May 21, 2019.

Where is Matthew Nguyen located?

Matthew Nguyen practices at 127 S San Vicente Blvd Fl 7, Los Angeles, CA 90048. The listed phone number is (310) 423-8030.

What is Matthew Nguyen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Matthew Nguyen enrolled in Medicare?

Yes. Matthew Nguyen is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Matthew Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Nguyen reassigns Medicare benefits to St Clair Professional Services Inc (Pittsburgh, PA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Matthew Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Matthew Nguyen was last updated on October 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days 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.