Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ngassa A Mssika, DO

Individual provider Emergency Medicine Physician · NPI 1932410461

Ngassa A Mssika, DO practises Emergency Medicine in Oshkosh, Wisconsin. Qualified in 2020, 6 years ago. Practices with Mchs Hospitals Inc, a 1,194-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
6
Licensed in
WI
In the registry since
2010
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

855 N Westhaven Dr
Oshkosh, WI 54904-7668
Phone: (920) 303-8700
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 164 N Broadway, Green Bay, WI 54303-2728 — (920) 490-9046
  • 1700 W Stout St, Rice Lake, WI 54868-5000 — (715) 387-5511

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 81255 (WI)

Record details

NPI number1932410461
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 30, 2010
Last updated in NPPESJanuary 8, 2026
Certification dateJanuary 8, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice McHs Hospitals Inc — 1194 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations8 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients295
Services billed 467 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Mchs Hospitals Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1194 clinicians in the practice; 12 are shown here.

Other providers in Oshkosh