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Internal Medicine - Infectious Diseases in Pasadena, CA

Browse 16 Internal Medicine - Infectious Disease providers listed in NPPES with a practice address in Pasadena, California.

16 Healthcare Providers

How Pasadena compares with the U.S.

Pasadena has 12 clinicians in Internal Medicine - Infectious Disease per 100,000 residents, 3.6 times the U.S. rate of 3.2.

That is 16 active clinicians in Internal Medicine - Infectious Disease with a practice address in Pasadena, for a population of 136,969.

The California rate is 2.9 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.

91% of clinicians in Internal Medicine - Infectious Disease in Pasadena listed in the CMS Medicare file (10 of 11) accept Medicare assignment. That is similar to the California share of 96%.

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.

18% of clinicians in Internal Medicine - Infectious Disease in Pasadena listed in the CMS Medicare file (2 of 11) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the California share of 44%.

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).

Internal Medicine - Infectious Disease Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine - Infectious Disease practitioners in Pasadena, CA

Source: CMS PECOS
PECOS Enrolled Specialists 14 In Pasadena, CA
Part B Lab & Imaging Eligible 14 Diagnostic Referrals
DME Ordering Eligible 14 Durable Medical Equipment
Home Health Agency Referrals 14 HHA Ordering Eligible
Showing 1โ€“16 of 16 providers
With recent CMS data first, then Aโ€“Z

Dr. Grace Sevilla Bautista , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
675 Arroyo Parkway, Suite 330, Pasadena, CA 90640
Phone: 6263955268
NPI Identifier 1215021720
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Dr. Elisa Lee Chang , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1811284193
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Dr. David Peter Delbello , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1790988269
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Dr. Ryan Hyun Wook Joo , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1639301922
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Dr. Praneet Kalkat , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1013440114
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Dr. Arbi Khodadadi , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
959 E Walnut St, Suite 120, Pasadena, CA 911061451
Phone: 6263040782
NPI Identifier 1730271099
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Dr. Joseph Kim , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1568623049
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Dr. Luong T Ly , MD

Internal Medicine - Infectious Disease

Active NPI Status
99 S Raymond Ave # 610, Pasadena, CA 911052046
Phone: 6268907973
NPI Identifier 1538101670
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Dr. David Gee Man , MD

Internal Medicine - Infectious Disease

Active NPI Status
50 Alessandro Pl, Suite 360, Pasadena, CA 911053149
Phone: 6267936133
NPI Identifier 1366450637
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Dr. Mark Edmund Miller , MD

Internal Medicine - Infectious Disease

Active NPI Status
800 Fairmount Ave, 205, Pasadena, CA 911053150
Phone: 6264051513
NPI Identifier 1881647139
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Dr. Paul Henry Nieberg , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
960 E Green St Ste 105, Pasadena, CA 911062443
Phone: 6263040782
NPI Identifier 1902909187
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Dr. Steven Anthony Pavkovic , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6264601796
NPI Identifier 1205918422
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Dr. Kimberly Anne Shriner , MD

Internal Medicine - Infectious Disease

Active NPI Status
50 Alessandro Pl, Suite 360, Pasadena, CA 911053149
Phone: 6267936133
NPI Identifier 1003926882
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Dr. Sara Ayesha Sirajuddin , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
100 W California Blvd, Pasadena, CA 911053010
Phone: 6263975000
NPI Identifier 1568706059
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Dr. Sandra Louise Wallace , MD

Internal Medicine - Infectious Disease

Active NPI Status
50 Alessandro Pl, Suite 360, Pasadena, CA 911053149
Phone: 6267936133
NPI Identifier 1235140930
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Dr. Vivian Yeh , MD

Internal Medicine - Infectious Disease

Active NPI Status
1845 N Fair Oaks Ave, Suite G-151, Pasadena, CA 911031620
Phone: 6267446140
NPI Identifier 1407057318
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Frequently Asked Questions about Internal Medicine - Infectious Disease in Pasadena

How do I check a Internal Medicine - Infectious Disease 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.