Willem Xu, MD
NPI 1013570480 · Anesthesiology Physician · Santa Ana, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Willem Xu, MD is a Anesthesiology Physician provider in Santa Ana, CA (NPI 1013570480).
Provider details
- NPI number
- 1013570480
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A187501 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-04-20
- Last updated
- 2024-06-17
- Certified
- 2024-06-17
Frequently asked questions
- What is Willem Xu's NPI number?
- Willem Xu's National Provider Identifier (NPI) is 1013570480, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Willem Xu's specialty?
- Willem Xu is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Willem Xu located?
- Willem Xu's practice location on file with NPPES is 400 N Tustin Ave, Santa Ana, CA 92705-3813.
- What is Willem Xu's phone number?
- The practice phone number listed in the NPPES registry for Willem Xu is (714) 619-5391.
- Does Willem Xu accept Medicare?
- Willem Xu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Willem Xu's NPI active?
- Yes — Willem Xu's NPI (1013570480) is active in the NPPES registry as of the last update on 2024-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.