KEITH CHUNYEN HSU MD
NPI 1891921458
Hospitalist in Mission Viejo, CA
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
Specialties & Licenses
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
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.
Medicare Billing Reassignment
Medicare enrollment records show Keith Hsu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Mission Viejo, CA 92691
- Reassigned Medicare billing, California enrollment
- 1,699 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.
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.
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.
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.
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.
MISSION VIEJO, CA 92691
MISSION VIEJO, CA 92691
MISSION VIEJO, CA 92691
MISSION VIEJO, CA 92691
MISSION VIEJO, CA 92691
MISSION VIEJO, CA 92691
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.
Which organization bills Medicare for Keith Hsu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Keith Hsu reassigns Medicare benefits to Providence Medical Foundation (Mission Viejo, CA). The 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 Keith Hsu'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 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 6 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.
# Keith Chunyen Hsu, MD · NPI 1891921458
Hospitalist physician in Mission Viejo, California. Individual provider, active in the CMS NPPES registry since June 9, 2009.
## Identity
- **NPI:** 1891921458 (Entity type: Individual)
- **Enumerated:** June 9, 2009
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A110787C (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 26800 CROWN VALLEY PKWY, SUITE 305, Mission Viejo, CA 92691-6384
- **Phone:** (949) 364-6000 · **Fax:** (949) 367-0518
## 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:** Providence Medical Foundation (NPI 1427305960, Mission Viejo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, class of 2008
## Record status
- **NPPES last updated:** October 28, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1891921458) · Data from the CMS NPPES public registry.