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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

KAREN XIAO MD
NPI 1063153088
Emergency Medicine in Pasadena, CA

Active since April 05, 2022PECOS Enrolled
100 W CALIFORNIA BLVD, PASADENA, CA 91105(855) 522-7898 Get Directions Write a Review

NPPES record last updated: July 7, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 7, 2026, Apr 5, 2022 (2 updates tracked since 2022).

About Karen Xiao Md NPPES

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

KAREN XIAO MD (NPI 1063153088) is an individual emergency medicine provider in Pasadena, California, licensed in California (A207900) and active in the NPI registry since April 2022. She is enrolled in Medicare PECOS and is a graduate of Drexel University College Of Medicine (2022).

NPPES Registry Identity

NPI1063153088
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameKAREN XIAOCredential: MD
Location Address100 W CALIFORNIA BLVDPasadena, CA 91105-3010
Mailing AddressPo Box 60259Los Angeles, CA 90060-0259 · (877) 346-2211
Phone(855) 522-7898
Sole ProprietorNo
Medical School CMSDrexel University College Of MedicineGraduated 2022
Enumeration DateApril 5, 2022
Last NPPES UpdateJuly 7, 20262 updates tracked since enumeration
NPPES CertifiedJuly 7, 2026
✔ NPI 1063153088 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A207900
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
100 W CALIFORNIA BLVD, Pasadena, CA 91105
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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 (PECOS)

Karen Xiao Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID42775496
PECOS Enrollment IDI20260716003576
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 91105 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
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.

SARAH STEPHENS NP
Nurse Practitioner (Acute Care)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-8300
AUSTIN WU MD
Anesthesiology
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (310) 267-8654
ROMELIA JALEH BATANG GARCIA RNFA
Registered Nurse (Registered Nurse First Assistant)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5012
DR. RICHARD A. REED MEDICAL DOCTOR
Radiology (Diagnostic Radiology)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5139
DR. HENRY LEVENSON M.D.
Pain Medicine (Pain Medicine)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 256-6010
PASADENA HOSPITAL ASSOCIATION, LTD.
Rehabilitation Unit
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5555
ANIL K HANUMAN D,O.
Hospitalist
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-8300
DR. NICHOLAS WITHROW GRECO M.D.
Emergency Medicine
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5112

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 Karen Xiao's NPI number?

The NPI number for Karen Xiao is 1063153088. It was assigned to this individual provider in the NPPES registry on April 5, 2022.

Where is Karen Xiao located?

Karen Xiao practices at 100 W California Blvd, Pasadena, CA 91105. The listed phone number is (855) 522-7898.

What is Karen Xiao's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Karen Xiao enrolled in Medicare?

Yes. Karen Xiao is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Karen Xiao was last updated on July 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 42 days 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.