NGASSA A MSSIKA DO
NPI 1932410461
Emergency Medicine in Oshkosh, WI
About Ngassa A Mssika Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NGASSA A MSSIKA DO (NPI 1932410461) is an individual emergency medicine provider in Oshkosh, Wisconsin, licensed in Wisconsin (81255) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS, is affiliated with Marshfield Medical Center - Rice Lake, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
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
Ngassa A Mssika Do 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
8Medicare enrollment records show Ngassa Mssika reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waupun, WI 53963
- Reassigned Medicare billing, Wisconsin enrollment
- 1,447 clinicians in this Medicare group
Sheboygan, WI 53081
- Reassigned Medicare billing, Wisconsin enrollment
- 4,609 clinicians in this Medicare group
Plover, WI 54467
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1952890873 (Wisconsin)
- 2,476 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,283 clinicians in this Medicare group
Black River Falls, WI 54615
- Reassigned Medicare billing, Wisconsin enrollment
- 174 clinicians in this Medicare group
Park Falls, WI 54552
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1700963048 (Wisconsin)
- 1,351 clinicians in this Medicare group
Chetek, WI 54728
- Reassigned Medicare billing, Wisconsin enrollment
- 1,616 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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marshfield Medical Center - Rice Lake
Acute Care Hospitals · Rice Lake, WIMarshfield Medical Center
Acute Care Hospitals · Marshfield, WIBay Area Medical Center
Acute Care Hospitals · Marinette, WIAurora Medical Ctr Oshkosh
Acute Care Hospitals · Oshkosh, WIMarshfield Medical Center - Minocqua
Acute Care Hospitals · Minocqua, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54904 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
OSHKOSH, WI 54904
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 Ngassa Mssika's NPI number?
The NPI number for Ngassa Mssika is 1932410461. It was assigned to this individual provider in the NPPES registry on June 30, 2010.
Where is Ngassa Mssika located?
Ngassa Mssika practices at 855 N Westhaven Dr, Oshkosh, WI 54904. The listed phone number is (920) 303-8700.
What is Ngassa Mssika's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ngassa Mssika enrolled in Medicare?
Yes. Ngassa Mssika 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 Ngassa Mssika's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ngassa Mssika reassigns Medicare benefits to 8 organizations: Beaver Dam Community Hospitals Inc (Waupun, WI), Aurora Medical Group, Inc. (Sheboygan, WI), Mchs Hospitals, Inc. (Plover, WI), Marshfield Clinic Inc (Marshfield, WI), Memorial Hospital, Inc (Neillsville, WI) and 3 more organizations, listed in the Medicare section above. 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 Ngassa Mssika's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ngassa Mssika accept?
Health plans from CareSource (Common Ground Healthcare) and Sanford Health Plan list Ngassa Mssika 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 Ngassa Mssika affiliated with any hospitals?
According to CMS data, Ngassa Mssika is affiliated with Marshfield Medical Center - Rice Lake, Marshfield Medical Center, Bay Area Medical Center, Aurora Medical Ctr Oshkosh and Marshfield Medical Center - Minocqua.
When was this NPI record last updated?
The NPPES record for Ngassa Mssika was last updated on January 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Ngassa A Mssika, DO · NPI 1932410461
Emergency Medicine physician in Oshkosh, Wisconsin. Individual provider, active in the CMS NPPES registry since June 30, 2010.
## Identity
- **NPI:** 1932410461 (Entity type: Individual)
- **Enumerated:** June 30, 2010
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 81255 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 855 N WESTHAVEN DR, Oshkosh, WI 54904-7668
- **Phone:** (920) 303-8700
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Beaver Dam Community Hospitals Inc (NPI 1629374780, Waupun, WI); Aurora Medical Group, Inc. (NPI 1174670244, Sheboygan, WI); Mchs Hospitals, Inc. (NPI 1386249894, Plover, WI); Marshfield Clinic Inc (NPI 1952347981, Marshfield, WI); Memorial Hospital, Inc (NPI 1679746747, Neillsville, WI); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** January 8, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1932410461) · Data from the CMS NPPES public registry.