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KEITH CHUNYEN HSU MD
NPI 1891921458
Hospitalist in Mission Viejo, CA

Active since June 09, 2009PECOS EnrolledAccepts Medicare Assignment
26800 CROWN VALLEY PKWY, SUITE 305, MISSION VIEJO, CA 92691(949) 364-6000(949) 367-0518 Get Directions Write a Review

NPPES record last updated: October 28, 2020. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Oct 28, 2020, Feb 25, 2019 (2 updates tracked since 2019).

About Keith Chunyen Hsu Md NPPES

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

KEITH CHUNYEN HSU MD (NPI 1891921458) is an individual hospitalist provider in Mission Viejo, California, licensed in California (A110787C) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS and is a graduate of Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University (2008).

NPPES Registry Identity

NPI1891921458
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameKEITH CHUNYEN HSUCredential: MD
Location Address26800 CROWN VALLEY PKWY, SUITE 305Mission Viejo, CA 92691-6384
Mailing Address26800 Crown Valley Pkwy Ste 305Mission Viejo, CA 92691-8017 · (949) 364-6000
Phone(949) 364-6000
Fax(949) 367-0518
Sole ProprietorNo
Medical School CMSClvlnd Clinic Lerner College Of Med Of Case Wstn Rsv UniversityGraduated 2008
Enumeration DateJune 9, 2009
Last NPPES UpdateOctober 28, 20202 updates tracked since enumeration
NPPES CertifiedOctober 28, 2020
✔ NPI 1891921458 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in CA · A110787C
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.
26800 CROWN VALLEY PKWY, Mission Viejo, CA 92691
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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

Keith Chunyen Hsu 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 ID7012189210
PECOS Enrollment IDI20111012000521
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.

Areas of Expertise CMS Part B claims 5

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 straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
649 services194 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.
160 services153 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.
137 services136 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.
35 services29 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.
14 services14 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 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 suppliers18 claims18 services$14.05 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
3 suppliers28 claims28 services$57.84 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 Keith Hsu's NPI number?

The NPI number for Keith Hsu is 1891921458. It was assigned to this individual provider in the NPPES registry on June 9, 2009.

Where is Keith Hsu located?

Keith Hsu practices at 26800 Crown Valley Pkwy Suite 305, Mission Viejo, CA 92691. The listed phone number is (949) 364-6000.

What is Keith Hsu's specialty?

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

Is Keith Hsu enrolled in Medicare?

Yes. Keith Hsu 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 Keith Hsu was last updated on October 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.