Brenda J. Grass, MD
Adolescent Medicine (Internal Medicine) Physician · Fond Du Lac, WI
Brenda J. Grass, MD is an adolescent medicine (internal medicine) physician with a practice address in Fond Du Lac, Wisconsin, and NPI 1356332753, issued on Nov 3, 2005. Check the license (Wisconsin 43233, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Brenda J. Grass
- Credential
- MD
- Primary taxonomy
- Adolescent Medicine (Internal Medicine) Physician 207RA0000X
- License number
- 43233 WI
Self-reported in NPPES; status is on the state search - Practice location
- 420 E Division St, Fond Du Lac, WI 54935
- Phone
- (920) 926-8615
- Enumerated
- Nov 3, 2005
- Record last updated
- Dec 10, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 34090400 WI
- Medicare enrollment
- Enrolled (PECOS I20100406000469); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1992
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
3 nearest adolescent medicine (internal medicine) physician records → All 4 in Wisconsin → Look up another NPI →
Also registered at 420 E Division St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elizabeth Berenz, FNP-BCFamily Nurse Practitioner1619386885
- Melissa Berggren, PA-CPhysician Assistant1639377617
- Louann Biddick, NPNurse Practitioner1770566721
- Jennifer Bissell, MDFamily Medicine Physician1316146962
- Tiffany Boelk, APNPNurse Practitioner1700459690
- David Bowman, M.D.Cardiovascular Disease Physician1962492397
Verify Brenda J. Grass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 43233Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average adolescent medicine (internal medicine) physician in 2024
3,597 Medicare Part D claims for 287 beneficiaries, against an average of 3,639 among the 177 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 21 claims were for opioids.
Most prescribed
- Simvastatin275 claims
- Rosuvastatin Calcium185 claims
- Lisinopril178 claims
- Levothyroxine Sodium168 claims
- Amlodipine Besylate148 claims
- Metformin Hcl105 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
- Agnesian Healthcare IncFond Du Lac, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Adolescent Medicine (Internal Medicine) Physician providers in Wisconsin
There are 4 adolescent medicine (internal medicine) physician records in Wisconsin.
All 4 in Wisconsin → Every provider in Fond Du Lac → Adolescent Medicine (Internal Medicine) Physician nationwide →
The 3 adolescent medicine (internal medicine) physician records with the nearest ZIP codes
- Dharmesh Babaria, MDEau Claire, WI 547011053421206
- Mariano Rosales, M.D.Waupun, WI 539631982658118
- Miroslaw Rogalski, MDUnion Grove, WI 531821598868630
Common questions
What is Brenda J. Grass, MD's NPI number?
Brenda J. Grass, MD's National Provider Identifier (NPI) is 1356332753, issued on Nov 3, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Brenda J. Grass, MD located?
The NPPES record lists a practice address at 420 E Division St, Fond Du Lac, WI, 54935. Phone: (920) 926-8615. Providers update this record themselves, so call before visiting.
How can I verify Brenda J. Grass, MD's license?
NPPES lists Wisconsin license number 43233, 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 Brenda J. Grass, MD prescribe under Medicare Part D?
In 2024, Brenda J. Grass, MD had 3,597 Medicare Part D claims for 287 beneficiaries; the average among adolescent medicine (internal medicine) physician prescribers was 3,639. 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.