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DR. MICHAEL TIEU LOI DO
NPI 1861057556
Internal Medicine in Irvine, CA

Active since May 08, 2019PECOS EnrolledAccepts Medicare Assignment
11 TECHNOLOGY DR, IRVINE, CA 92618(949) 923-3200 Get Directions Write a Review

NPPES record last updated: November 23, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Nov 23, 2025, Jul 11, 2024, Jun 16, 2021 and 1 more (4 updates tracked since 2019).

About Dr. Michael Tieu Loi Do NPPES

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

DR. MICHAEL TIEU LOI DO (NPI 1861057556) is an individual internal medicine provider in Irvine, California, licensed in California (20A22634) and active in the NPI registry since May 2019. He is enrolled in Medicare PECOS and is a graduate of At Still Un Of Hlth Sciences, Col Of Osteo Med, Mesa (2021).

NPPES Registry Identity

NPI1861057556
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MICHAEL TIEU LOICredential: DO
Location Address11 TECHNOLOGY DRIrvine, CA 92618-2302
Mailing AddressPo Box 35380Las Vegas, NV 89133-5380 · (702) 579-3203
Phone(949) 923-3200
Sole ProprietorNo
Medical School CMSAt Still Un Of Hlth Sciences, Col Of Osteo Med, MesaGraduated 2021
Enumeration DateMay 8, 2019
Last NPPES UpdateNovember 23, 20254 updates tracked since enumeration
NPPES CertifiedNovember 23, 2025
✔ NPI 1861057556 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · 20A22634
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.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
11 TECHNOLOGY DR, Irvine, CA 92618
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Michael Tieu Loi Do 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 ID2567803067
PECOS Enrollment IDI20240515002227
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92618 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
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.

DR. MARIA TERESA CORPIN AGNER MD
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. SHAHNOOS MAHDAVI M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. JUSTIN D HARRIS M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. SUBRATO GHOSH MD
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. PARAG SHARMA M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. HAI XUAN LE M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. MOLOOD HADI DO
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. ALI AHOUI MD
Hospitalist
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764

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 Michael Loi's NPI number?

The NPI number for Michael Loi is 1861057556. It was assigned to this individual provider in the NPPES registry on May 8, 2019.

Where is Michael Loi located?

Michael Loi practices at 11 Technology Dr, Irvine, CA 92618. The listed phone number is (949) 923-3200.

What is Michael Loi's specialty?

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

Is Michael Loi enrolled in Medicare?

Yes. Michael Loi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Michael Loi was last updated on November 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.