DR. MARK CHU XU MD
NPI 1003699471
Orthopaedic Surgery in San Francisco, CA
About Dr. Mark Chu Xu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK CHU XU MD (NPI 1003699471) is an individual orthopaedic surgery provider in San Francisco, California, licensed in California (A188903) and active in the NPI registry since August 2023. He is enrolled in Medicare PECOS and is a graduate of University Of Manitoba, Faculty Of Medicine (2016).
NPPES Registry Identity
Specialties & Licenses 3
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
Dr. Mark Chu Xu 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
5Medicare enrollment records show Mark Xu reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 81 clinicians in this Medicare group
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 121 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 2
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 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Mark Xu's NPI number?
The NPI number for Mark Xu is 1003699471. It was assigned to this individual provider in the NPPES registry on August 17, 2023.
Where is Mark Xu located?
Mark Xu practices at 2540 23rd St Bldg 7, San Francisco, CA 94143. The listed phone number is (415) 476-2124.
What is Mark Xu's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Mark Xu enrolled in Medicare?
Yes. Mark Xu 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 Mark Xu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Xu reassigns Medicare benefits to 5 organizations: University Of California Sfgh Medical Group (San Francisco, CA), City & County Of San Francisco (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Washington Township Medical Foundation (Fremont, 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 Mark Xu'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 Mark Xu was last updated on August 17, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Mark Chu Xu, MD · NPI 1003699471
Orthopaedic Surgery physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since August 17, 2023.
## Identity
- **NPI:** 1003699471 (Entity type: Individual)
- **Enumerated:** August 17, 2023
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **State license:** A188903 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2540 23RD ST BLDG 7, San Francisco, CA 94143-2500
- **Phone:** (415) 476-2124
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): University Of California Sfgh Medical Group (NPI 1700057908, San Francisco, CA); City & County Of San Francisco (NPI 1083648810, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Washington Township Medical Foundation (NPI 1669360681, Fremont, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Manitoba, Faculty Of Medicine, class of 2016
## Record status
- **NPPES last updated:** August 17, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1003699471) · Data from the CMS NPPES public registry.