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LOAN T. NGUYEN MD
NPI 1346477858
Hospitalist in Mission Viejo, CA

Active since June 11, 2009PECOS EnrolledAccepts Medicare Assignment
26800 CROWN VALLEY PKWY, 315, MISSION VIEJO, CA 92691(949) 364-6000(949) 364-1204 Get Directions Write a Review

NPPES record last updated: November 9, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 9, 2021, Oct 28, 2020 (2 updates tracked since 2020).

About Loan T. Nguyen Md NPPES

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

LOAN T. NGUYEN MD (NPI 1346477858) is an individual hospitalist provider in Mission Viejo, California, licensed in California (A106830) and active in the NPI registry since June 2009. She is enrolled in Medicare PECOS and is a graduate of St. Louis College Of Physicians And Surgeons (2007).

NPPES Registry Identity

NPI1346477858
Entity TypeIndividualFemale
Primary Taxonomy208M00000X
Provider Legal NameLOAN T. NGUYENCredential: MD
Location Address26800 CROWN VALLEY PKWY, 315Mission Viejo, CA 92691-6384
Mailing Address26522 La Alameda, Suite 120Mission Viejo, CA 92691-6330 · (949) 282-1671 · Fax (949) 367-0518
Phone(949) 364-6000
Fax(949) 364-1204
Sole ProprietorNo
Medical School CMSSt. Louis College Of Physicians And SurgeonsGraduated 2007
Enumeration DateJune 11, 2009
Last NPPES UpdateNovember 9, 20212 updates tracked since enumeration
NPPES CertifiedNovember 9, 2021
✔ NPI 1346477858 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in CA · A106830
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Also ListedInternal MedicineTaxonomy 207R00000X · License A106830 (CA)
26800 CROWN VALLEY PKWY, Mission Viejo, CA 92691
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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

Loan T. 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 ID8921291568
PECOS Enrollment IDI20101015000112
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 Loan Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Providence Medical Foundation
0.1 mi
Family Medicine
26522 LA ALAMEDA, SUITE 120
Mission Viejo, CA 92691
  • Reassigned Medicare billing, California enrollment
  • 1,699 clinicians in this Medicare group
NPI 1427305960 (949) 364-9631

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 7

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.

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.
280 services137 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
161 services157 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
121 services118 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.
118 services53 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
33 services33 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
32 services32 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92691 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.

Referred Medical Equipment & Supplies CMS DME claims

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

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
3 suppliers15 claims15 services$62.08 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 20

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

AMY THU BUI M.D.
Specialist
26800 CROWN VALLEY PKWY, SUITE 230
MISSION VIEJO, CA 92691
Orange County (949) 542-8004
MATT AHMADI, DPM, INC.
Podiatrist (Foot & Ankle Surgery)
26800 CROWN VALLEY PKWY, SUITE 320
MISSION VIEJO, CA 92691
Orange County (949) 276-8900
MICHAEL PM TRUONG M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
26800 CROWN VALLEY PKWY, SUITE 230
MISSION VIEJO, CA 92691
Orange County (949) 364-3330
PETER C. CZULEGER M.D.
Emergency Medicine
26800 CROWN VALLEY PKWY, SUITE 150
MISSION VIEJO, CA 92691
Orange County (949) 276-2111
KATHLEEN MARY POLLOCK M.D.
Obstetrics & Gynecology
26800 CROWN VALLEY PKWY, SUITE 525
MISSION VIEJO, CA 92691
Orange County (949) 364-1040
TRICIA DAVID BATO D.D.S.
Dentist (Periodontics)
26800 CROWN VALLEY PKWY, STE 375
MISSION VIEJO, CA 92691
Orange County (949) 388-3877
DR. RICHARD JACOB M.D.
Internal Medicine (Cardiovascular Disease)
26800 CROWN VALLEY PKWY, SUITE 250
MISSION VIEJO, CA 92691
Orange County (949) 364-3570
HABIB AZAD M.D.
Internal Medicine (Nephrology)
26800 CROWN VALLEY PKWY, SUITE 250
MISSION VIEJO, CA 92691
Orange County (949) 364-0644

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 Loan Nguyen's NPI number?

The NPI number for Loan Nguyen is 1346477858. It was assigned to this individual provider in the NPPES registry on June 11, 2009.

Where is Loan Nguyen located?

Loan Nguyen practices at 26800 Crown Valley Pkwy 315, Mission Viejo, CA 92691. The listed phone number is (949) 364-6000.

What is Loan Nguyen's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Loan Nguyen enrolled in Medicare?

Yes. Loan Nguyen 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.

Which organization bills Medicare for Loan Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Loan Nguyen reassigns Medicare benefits to Providence Medical Foundation (Mission Viejo, CA). 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 Loan 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 Loan Nguyen was last updated on November 9, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.