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REX CHIU MD
NPI 1366580011
Internal Medicine in Menlo Park, CA

Active since February 02, 2007Opted out of Medicare · through Nov 4, 2026
321 MIDDLEFIELD ROAD, SUITE 275, MENLO PARK, CA 94025(650) 815-9577(650) 289-0166 Get Directions Write a Review

NPPES record last updated: February 20, 2009. Verified against the NPPES registry weekly; last sync: August 23, 2026.

About Rex Chiu Md NPPES

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

REX CHIU MD (NPI 1366580011) is an individual internal medicine provider in Menlo Park, California, licensed in California (G84116) and active in the NPI registry since February 2007. He has opted out of Medicare through November 4, 2026 and remains eligible to order and refer.

NPPES Registry Identity

NPI1366580011
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameREX CHIUCredential: MD
Location Address321 MIDDLEFIELD ROAD, SUITE 275Menlo Park, CA 94025
Mailing Address321 Middlefield Rd, Suite 275Menlo Park, CA 94025-3500 · (650) 815-9577 · Fax (650) 289-0166
Phone(650) 815-9577
Fax(650) 289-0166
Sole ProprietorYes
Enumeration DateFebruary 2, 2007
Last NPPES UpdateFebruary 20, 2009
✔ NPI 1366580011 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G84116
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
321 MIDDLEFIELD ROAD, Menlo Park, CA 94025
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Other Identifiers 1

Medicare UPING59617CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Rex Chiu Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from November 4, 2016 through November 4, 2026.

Opt-Out Effective DateNovember 4, 2016
Opt-Out In Effect ThroughNovember 4, 2026Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94025 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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 2

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

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
2 suppliers12 claims12 services$13.71 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers12 claims12 services$61.42 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 4

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

DANIEL ALLEN HUIE MD
Family Medicine
321 MIDDLEFIELD ROAD
MENLO PARK, CA 94025
San Mateo County (650) 498-6500
DR. SCOTT D FROSS DDS
Dentist (Oral and Maxillofacial Surgery)
321 MIDDLEFIELD ROAD, SUITE 110
MENLO PARK, CA 94025
San Mateo County (650) 328-2322
MRS. JENNIFER MIYE CHAN OTR.,CHT
Occupational Therapist
321 MIDDLEFIELD ROAD
MENLO PARK, CA 94025
San Mateo County (650) 462-0245
DR. JEFFERY ALLAN STARR DDS
Dentist
321 MIDDLEFIELD ROAD, SUITE 145
MENLO PARK, CA 94025
San Mateo County (650) 327-7101

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 Rex Chiu's NPI number?

The NPI number for Rex Chiu is 1366580011. It was assigned to this individual provider in the NPPES registry on February 2, 2007.

Where is Rex Chiu located?

Rex Chiu practices at 321 Middlefield Road Suite 275, Menlo Park, CA 94025. The listed phone number is (650) 815-9577.

What is Rex Chiu's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Rex Chiu enrolled in Medicare?

No. Rex Chiu has opted out of Medicare through November 4, 2026. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Rex Chiu was last updated on February 20, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 years 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.