KAREN XIAO MD
NPI 1063153088
Emergency Medicine in Pasadena, CA
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, maintains a secondary practice location in Brooklyn, and is a graduate of Drexel University College Of Medicine (2022).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Karen Xiao 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.
Medicare Billing Reassignments
2Medicare enrollment records show Karen Xiao reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pasadena, CA 91105
- Reassigned Medicare billing, California enrollment
- 64 clinicians in this Medicare group
Calabasas, CA 91302
- Reassigned Medicare billing, California enrollment
- 256 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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.
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.
PASADENA, CA 91105
PASADENA, CA 91105
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 system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karen Xiao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Xiao reassigns Medicare benefits to 2 organizations: Hmh Emergency Medical Group, Inc. (Pasadena, CA) and Exer Medical Corporation (Calabasas, CA). Each 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 Karen Xiao'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 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 3 months 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.
# Karen Xiao, MD · NPI 1063153088
Emergency Medicine physician in Pasadena, California. Individual provider, active in the CMS NPPES registry since April 5, 2022.
## Identity
- **NPI:** 1063153088 (Entity type: Individual)
- **Enumerated:** April 5, 2022
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A207900 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 W CALIFORNIA BLVD, Pasadena, CA 91105-3010
- **Phone:** (855) 522-7898
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Hmh Emergency Medical Group, Inc. (NPI 1659383024, Pasadena, CA); Exer Medical Corporation (NPI 1588901532, Calabasas, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Drexel University College Of Medicine, class of 2022
## Record status
- **NPPES last updated:** July 7, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1063153088) · Data from the CMS NPPES public registry.