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Hospitalists in Irvine, CA

Browse 39 Hospitalist providers listed in NPPES with a practice address in Irvine, California.

39 Healthcare Providers

How Irvine compares with the U.S.

Irvine has 13 Hospitalists per 100,000 residents, about 1.5 times the U.S. rate of 8.3.

That is 39 active Hospitalists with a practice address in Irvine, for a population of 311,690.

The California rate is 7.9 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

97% of Hospitalists in Irvine listed in the CMS Medicare file (37 of 38) accept Medicare assignment. That is similar to the California share of 98%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

8% of Hospitalists in Irvine listed in the CMS Medicare file (3 of 38) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the California share of 6%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Hospitalist Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Hospitalist practitioners in Irvine, CA

Source: CMS PECOS
PECOS Enrolled Specialists 39 In Irvine, CA
Part B Lab & Imaging Eligible 39 Diagnostic Referrals
DME Ordering Eligible 39 Durable Medical Equipment
Home Health Agency Referrals 39 HHA Ordering Eligible
Showing 1โ€“20 of 39 providers
With recent CMS data first, then Aโ€“Z

Dr. Ali Ahoui , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
11 Technology Dr, Irvine, CA 926182302
Phone: 8552066764
NPI Identifier 1093964769
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Dr. Ghazal N Bahri , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
1000 Fivepoint, Irvine, CA 926182621
Phone: 9496718000
NPI Identifier 1770013146
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Reza Bashtar

Hospitalist

Active NPI Status Accepts Medicare Assignment
13204 Telmo, Irvine, CA 926180281
Phone: 8582086550
NPI Identifier 1285868729
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Dr. Michael Caberto , DO

Hospitalist

Active NPI Status Accepts Medicare Assignment
1000 Fivepoint Ste A, Irvine, CA 926182621
Phone: 8008264673
NPI Identifier 1932565637
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Dr. John Chien , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1790043651
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Dr. Michael Thomas Cho , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9498736181
NPI Identifier 1184915001
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Dr. Robert D Cho , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1760578512
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Dr. Scott A Derkum , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1588660849
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Dr. John Dieckhoff , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1700068152
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Dr. Veejay N Geria , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1821193467
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Dr. Rasha Adnan Hindiyeh , MD, MBA

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1811127855
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Dr. Derrick Makoto Hong , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1124040696
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Dr. May Kam , DO

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 8886559463
NPI Identifier 1437500162
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Dr. Nam Uk Kim , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1861572513
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Dr. Ewa Kontny , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 8886558463
NPI Identifier 1598916587
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Dr. Meenu Kwatra , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
6640 Alton Pkwy, Irvine, CA 926183734
Phone: 9499325000
NPI Identifier 1265510028
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Dr. David Liao , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1316979909
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Dr. Susan Marie Marron , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
11 Technology Dr, Irvine, CA 926182302
Phone: 9499233200
NPI Identifier 1922006618
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Active NPI Status Accepts Medicare Assignment
16200 Sand Canyon Ave, Irvine, CA 926183714
Phone: 9496107245
NPI Identifier 1134548639
View Full Profile

Dr. Siamak N Nabili , MD

Hospitalist

Active NPI Status Accepts Medicare Assignment
11 Technology Dr, Irvine, CA 926182302
Phone: 8552066764
NPI Identifier 1407892490
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Frequently Asked Questions about Hospitalist in Irvine

How do I check a Hospitalist practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.