SIWEN LIU D.O.
NPI 1972037158
Surgery in Baldwin, WI
About Siwen Liu D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SIWEN LIU D.O. (NPI 1972037158) is an individual surgery provider in Baldwin, Wisconsin, licensed in Wisconsin (81075) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, is affiliated with Western Wisconsin Health, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 2
Accepted Insurance
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
Siwen Liu D.o. 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 Siwen Liu reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baldwin, WI 54002
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1467496133 (Wisconsin)
- 211 clinicians in this Medicare group
Baldwin, WI 54002
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Hudson Physicians Sc
- 74 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Western Wisconsin Health
Critical Access Hospitals · Baldwin, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54002 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.
BALDWIN, WI 54002
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 Siwen Liu's NPI number?
The NPI number for Siwen Liu is 1972037158. It was assigned to this individual provider in the NPPES registry on April 14, 2017. The provider is also known as Wendy Liu D.O..
Where is Siwen Liu located?
Siwen Liu practices at 1100 Bergslien St, Baldwin, WI 54002. The listed phone number is (715) 684-1111.
What is Siwen Liu's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Siwen Liu enrolled in Medicare?
Yes. Siwen Liu 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 Siwen Liu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Siwen Liu reassigns Medicare benefits to 2 organizations: Baldwin Area Medical Center, Inc. (Baldwin, WI) and Hudson Physicians, S.C (Baldwin, WI). 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 Siwen Liu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Siwen Liu accept?
Health plans from Anthem Blue Cross and Blue Shield, HealthPartners and Security Health Plan list Siwen Liu as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Siwen Liu affiliated with any hospitals?
According to CMS data, Siwen Liu is affiliated with Western Wisconsin Health.
When was this NPI record last updated?
The NPPES record for Siwen Liu was last updated on December 29, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Siwen Liu, D.O. · NPI 1972037158
Surgery physician in Baldwin, Wisconsin. Individual provider, active in the CMS NPPES registry since April 14, 2017.
## Identity
- **NPI:** 1972037158 (Entity type: Individual)
- **Enumerated:** April 14, 2017
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** 81075 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1100 BERGSLIEN ST, Baldwin, WI 54002-2600
- **Phone:** (715) 684-1111 · **Fax:** (715) 684-1119
## 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): Baldwin Area Medical Center, Inc. (NPI 1336228865, Baldwin, WI); Hudson Physicians, S.C (NPI 1093238347, Baldwin, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** December 29, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1972037158) · Data from the CMS NPPES public registry.