Stephen R. Dernlan, MD
Internal Medicine Physician · Appleton, WI
Stephen R. Dernlan, MD is an internal medicine physician with a practice address in Appleton, Wisconsin, and NPI 1083646608, issued on Jul 6, 2006. Check the license (Wisconsin 30115-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Stephen R. Dernlan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 30115-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3916 N Intertech CT, Appleton, WI 54913
- Phone
- (920) 996-1000
- Enumerated
- Jul 6, 2006
- Record last updated
- Jun 1, 2023
- Fax
- (920) 997-8302
- Medicaid ID
- 31480500 WI
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 3916 N Intertech CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicholas Brice, PAPhysician Assistant1699262378
- Brandon Bukovitz, MDInternal Medicine Physician1831768399
- Christina Carnes, PA-CPhysician Assistant1376616417
- David Cupp, MDFamily Medicine Physician1184373789
- Aaron Douglas, MDFamily Medicine Physician1346252442
- Sonya Eiben, MDInternal Medicine Physician1710916812
Verify Stephen R. Dernlan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 30115-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average internal medicine physician in 2024
709 Medicare Part D claims for 231 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Atorvastatin Calcium40 claims
- Amlodipine Besylate37 claims
- Lisinopril33 claims
- Omeprazole27 claims
- Losartan Potassium25 claims
- Simvastatin25 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.
Stephen R. Dernlan among 2,078 internal medicine physician records in Wisconsin
Stephen R. Dernlan, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2023 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 internal medicine physician records list a practice address in Appleton
They are 39 of the 3,249 NPPES records with a practice address in Appleton, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Appleton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Brandon Bukovitz, MDAppleton, WI 549131831768399
- Arun Cherian, M.DAppleton, WI 549131235478538
- Joan Crennan, MDAppleton, WI 549131679666952
- Sonya Eiben, MDAppleton, WI 549131710916812
- Chenhao Fan, M.D.Appleton, WI 549131831351105
- Scott Gyorog, MDAppleton, WI 549131235346586
- Roderick Hubert, MDAppleton, WI 549131942350947
- Mbonu Ikezuagu, M.D.Appleton, WI 549131871721696
Common questions
What is Stephen R. Dernlan, MD's NPI number?
Stephen R. Dernlan, MD's National Provider Identifier (NPI) is 1083646608, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen R. Dernlan, MD located?
The NPPES record lists a practice address at 3916 N Intertech CT, Appleton, WI, 54913. Phone: (920) 996-1000. Providers update this record themselves, so call before visiting.
How can I verify Stephen R. Dernlan, MD's license?
NPPES lists Wisconsin license number 30115-020, 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 Stephen R. Dernlan, MD prescribe under Medicare Part D?
In 2024, Stephen R. Dernlan, MD had 709 Medicare Part D claims for 231 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.