Bobby Byung Sun Yun, MD
Family Medicine Physician · Oshkosh, WI
Bobby Byung Sun Yun, MD is a family medicine physician with a practice address in Oshkosh, Wisconsin, and NPI 1154399061, issued on Mar 8, 2006. Check the license (Wisconsin 46857, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Bobby Byung Sun Yun
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 46857 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1855 S Koeller St, Oshkosh, WI 54902
- Phone
- (920) 223-7010
- Enumerated
- Mar 8, 2006
- Record last updated
- Nov 19, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20040824000155); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1998
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 1855 S Koeller St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kristian Bastress, DNP, APNP, FNP-BCFamily Nurse Practitioner1154947851
- Angela Beach, NP-CFamily Nurse Practitioner1881197028
- Brenda Brusky, NPAdult Health Nurse Practitioner1760749097
- Steven Cavness, PHDPsychologist1669466421
- David Coleman, MDFamily Medicine Physician1639170301
Verify Bobby Byung Sun Yun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 46857Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average family medicine physician in 2024
215 Medicare Part D claims for 125 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone38 claims
- Azithromycin28 claims
- Doxycycline Hyclate19 claims
- Cephalexin16 claims
- Nitrofurantoin Mono-Macro11 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.
Industry payments in 2024: $15.70
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 55,478 providers of this specialty with any payment received $902.55 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 one group practice
- Urgent Care Physcians, LtdAppleton, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Bobby Byung Sun Yun among 3,765 family medicine physician records in Wisconsin
Bobby Byung Sun Yun, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1998 · median 2007 among the 2,347 with a school on file
- Record last updated2013 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
52 family medicine physician records list a practice address in Oshkosh
They are 52 of the 1,527 NPPES records with a practice address in Oshkosh, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Oshkosh → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- David Coleman, MDOshkosh, WI 549021639170301
- Katherine Hartstern, MDOshkosh, WI 549021437773652
- David Maruska, MDOshkosh, WI 549021508848847
- Christal Sakrison, MDOshkosh, WI 549021073508487
- James Smrecek, MDOshkosh, WI 549021063407385
- Glenn Vogelsang, M.D., PHDOshkosh, WI 549021538245642
- Thomas Wex, MDOshkosh, WI 549021508851825
- Sarah Wypiszynski, MDOshkosh, WI 549021568994853
Common questions
What is Bobby Byung Sun Yun, MD's NPI number?
Bobby Byung Sun Yun, MD's National Provider Identifier (NPI) is 1154399061, issued on Mar 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Bobby Byung Sun Yun, MD located?
The NPPES record lists a practice address at 1855 S Koeller St, Oshkosh, WI, 54902. Phone: (920) 223-7010. Providers update this record themselves, so call before visiting.
How can I verify Bobby Byung Sun Yun, MD's license?
NPPES lists Wisconsin license number 46857, 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 Bobby Byung Sun Yun, MD prescribe under Medicare Part D?
In 2024, Bobby Byung Sun Yun, MD had 215 Medicare Part D claims for 125 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.