Casey Birschbach, MD
Internal Medicine Physician · Madison, WI
Casey Birschbach, MD is an internal medicine physician with a practice address in Madison, Wisconsin, and NPI 1366005928, issued on Apr 19, 2019. Check the license on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Casey Birschbach
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2021-03455 NC
Self-reported in NPPES; status is on the state search - Practice location
- 4410 Regent St, Madison, WI 53705
- Phone
- (608) 233-9746
- Enumerated
- Apr 19, 2019
- Entity
- Type 1 · individual
Also registered at 4410 Regent St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Thomas Ansfield, M.D.Internal Medicine Physician1700848538
- Amy Buencamino, M.D.Pediatrics Physician1619939493
- Puneet Dhillon, M.D.Internal Medicine Physician1073855474
- Nicole Ertl, M.D.Pediatrics Physician1457664385
- John Ewalt, M.D.Internal Medicine Physician1518923283
- Amy Fothergill, M.D.Internal Medicine Physician1063646370
Verify Casey Birschbach in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
49% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,609 Medicare Part D claims for 230 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 96 claims were for opioids.
Most prescribed
- Losartan Potassium80 claims
- Amlodipine Besylate76 claims
- Levothyroxine Sodium72 claims
- Atorvastatin Calcium71 claims
- Lisinopril44 claims
- Omeprazole42 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
- Associated Physicians, LLPMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
417 internal medicine physician records list a practice address in Madison
They are 417 of the 15,014 NPPES records with a practice address in Madison, and 2,078 internal medicine physician records in Wisconsin.
All 417 in Madison → All 2,078 in Wisconsin → Every provider in Madison →
Other internal medicine physician records in Wisconsin
- Sheetal Aatrai, MDMarshfield, WI1417568965
- Khalid Abdelgadir, MDManitowoc, WI1407433295
- Mesfin Abdissa, MDMilwaukee, WI1376579417
- Anas Abed, MDMadison, WI1659002566
- Margaret Abel, MDRhinelander, WI1477590487
- Mesfin Abera, M.D.Beaver Dam, WI1972852390
- Vidthya Abraham, M.D.Madison, WI1861836058
- Ismael Abu Limon, MDGreenfield, WI1467945543
- Amjed Abu Muhanna, MDMarinette, WI1861514135
- Satish Achanti, MDAppleton, WI1982711198
Common questions
What is Casey Birschbach, MD's NPI number?
Casey Birschbach, MD's National Provider Identifier (NPI) is 1366005928, issued on Apr 19, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Casey Birschbach, MD located?
The NPPES record lists a practice address at 4410 Regent St, Madison, WI, 53705. Phone: (608) 233-9746. Providers update this record themselves, so call before visiting.
How can I verify Casey Birschbach, MD's license?
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 Casey Birschbach, MD prescribe under Medicare Part D?
In 2024, Casey Birschbach, MD had 1,609 Medicare Part D claims for 230 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), loaded Aug 27, 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 27, 2026.