Justin J. Yoon, M.D.
Endocrinology, Diabetes & Metabolism Physician · Grafton, WI
Justin J. Yoon, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Grafton, Wisconsin, and NPI 1669815247, issued on Apr 12, 2013. Check the license (Wisconsin 69491-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Justin J. Yoon
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 69491-20 WI
LP03680 RI
Self-reported in NPPES; status is on the state search - Practice location
- 215 W Washington St, Grafton, WI 53024
- Phone
- (262) 375-3700
- Enumerated
- Apr 12, 2013
- Record last updated
- Aug 5, 2024
- Medicaid ID
- 100080051 WI
- Medicare enrollment
- Enrolled (PECOS I20180827000002); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 187 in Wisconsin → Look up another NPI →
Also registered at 215 W Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Richard Bunting, MDInternal Medicine Physician1730111964
- Thomas Chatton, MDPediatrics Physician1306878541
- Kathryn Hayes, PTPhysical Therapist1740215136
Verify Justin J. Yoon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 69491-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
6,049 Medicare Part D claims for 655 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Levothyroxine Sodium532 claims
- Ozempic320 claims
- Jardiance294 claims
- Metformin Hcl Er292 claims
- Mounjaro288 claims
- Alendronate Sodium259 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.
Bills Medicare through one group practice
- Aurora Advanced Healthcare, Inc.Grafton, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin J. Yoon among 187 endocrinology, diabetes & metabolism physician records in Wisconsin
Justin J. Yoon, M.D. is one of 187 endocrinology, diabetes & metabolism physician records with a practice address in Wisconsin. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 28% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2013 · median 2003 among the 134 with a school on file
- Record last updated2024 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Wisconsin
There are 187 endocrinology, diabetes & metabolism physician records in Wisconsin.
All 187 in Wisconsin → Every provider in Grafton → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Samuel Yoon, M.D.Hartland, WI 530291043692627
- Nicolas Mungo, MDBrookfield, WI 530451245627991
- James Findling, MDMenomonee Falls, WI 530511295803401
- Bradley Javorsky, M.D.Menomonee Falls, WI 530511568402139
- Steven Magill, MDMenomonee Falls, WI 530511508973066
- Tiffany Mork, MDMenomonee Falls, WI 530511376650671
- Joseph Shaker, MDMenomonee Falls, WI 530511164561247
- Bhavin Shastri, MDMenomonee Falls, WI 530511689875734
Common questions
What is Justin J. Yoon, M.D.'s NPI number?
Justin J. Yoon, M.D.'s National Provider Identifier (NPI) is 1669815247, issued on Apr 12, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Justin J. Yoon, M.D. located?
The NPPES record lists a practice address at 215 W Washington St, Grafton, WI, 53024. Phone: (262) 375-3700. Providers update this record themselves, so call before visiting.
How can I verify Justin J. Yoon, M.D.'s license?
NPPES lists Wisconsin license number 69491-20, 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 Justin J. Yoon, M.D. prescribe under Medicare Part D?
In 2024, Justin J. Yoon, M.D. had 6,049 Medicare Part D claims for 655 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.