Ngassa A. Mssika, DO
Emergency Medicine Physician · Oshkosh, WI
Ngassa A. Mssika, DO is an emergency medicine physician with a practice address in Oshkosh, Wisconsin, and NPI 1932410461, issued on Jun 30, 2010. Check the license (Wisconsin 81255, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Ngassa A. Mssika
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 81255 WI
Self-reported in NPPES; status is on the state search - Practice location
- 855 N Westhaven Dr, Oshkosh, WI 54904
- Phone
- (920) 303-8700
- Enumerated
- Jun 30, 2010
- Record last updated
- Jan 8, 2026
- Medicare enrollment
- Enrolled (PECOS I20231018002782); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Also registered at 855 N Westhaven Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rami Abumasmah, MDHematology & Oncology Physician1972779551
- Abdulmajid AdamHospitalist Physician1528362258
- Awais Ahmed, MDGastroenterology Physician1316213481
- Kate Alexander, PA-CPhysician Assistant1700466414
- Hussein Alramini, M.D.Hospitalist Physician1497106512
- Ammar Alzoubi, MDInternal Medicine Physician1598773152
Verify Ngassa A. Mssika in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 81255Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% more Medicare Part D claims than the average emergency medicine physician in 2024
368 Medicare Part D claims for 251 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 60 claims were for opioids.
Most prescribed
- Tramadol Hcl38 claims
- Cephalexin34 claims
- Ondansetron Odt31 claims
- Prednisone25 claims
- Doxycycline Monohydrate24 claims
- Methylprednisolone22 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $85.93
1 payment: food and beverage; the largest payer was Amgen Inc. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Aurora Medical Group, Inc.Oshkosh, WI
- Lakeview Medical Center Inc OF Rice LakeRice Lake, WI
- Mchs Hospitals IncMarshfield, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ngassa A. Mssika among 1,464 emergency medicine physician records in Wisconsin
Ngassa A. Mssika, DO is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 56% of them.
- NPI issued2010 · 56% of these records are older, 42% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2020 · median 2011 among the 844 with a school on file
- Record last updated2026 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 emergency medicine physician records list a practice address in Oshkosh
They are 22 of the 1,527 NPPES records with a practice address in Oshkosh, and 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Oshkosh → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Benjamin Genesis Bautista, MDOshkosh, WI 549041396051561
- Craig Brewster, DOOshkosh, WI 549041700378130
- Christopher Chancey, DOOshkosh, WI 549041588833370
- Daniel Gale, MDOshkosh, WI 549041346530979
- Darren Heesacker, MDOshkosh, WI 549041013953561
- Thomas Plank, MDOshkosh, WI 549041811914245
- Kevin Polglaze, DOOshkosh, WI 549041053555367
- Jane Reid, MDOshkosh, WI 549041528042793
Common questions
What is Ngassa A. Mssika, DO's NPI number?
Ngassa A. Mssika, DO's National Provider Identifier (NPI) is 1932410461, issued on Jun 30, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ngassa A. Mssika, DO located?
The NPPES record lists a practice address at 855 N Westhaven Dr, Oshkosh, WI, 54904. Phone: (920) 303-8700. Providers update this record themselves, so call before visiting.
How can I verify Ngassa A. Mssika, DO's license?
NPPES lists Wisconsin license number 81255, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ngassa A. Mssika, DO prescribe under Medicare Part D?
In 2024, Ngassa A. Mssika, DO had 368 Medicare Part D claims for 251 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Ngassa A. Mssika, DO's MIPS final score?
The 2023 MIPS final score is 100 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.