NPPES file of Aug 9, 2026

Casey Ann Birschbach, MD

Internal Medicine Physician · Madison, WI

Casey Ann 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.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1366005928
Name
Casey Ann 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
Record last updated
Jun 27, 2024
Fax
(608) 236-1981
Medicare enrollment
Enrolled (PECOS I20230831004156); accepts Medicare assignment
Medical or professional school
University Of Wisconsin School Of Medicine, 2019
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 4410 Regent St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Thomas Ansfield, M.D.Internal Medicine Physician1700848538
  2. Amy Buencamino, M.D.Pediatrics Physician1619939493
  3. Puneet Dhillon, M.D.Internal Medicine Physician1073855474
  4. Nicole Ertl, M.D.Pediatrics Physician1457664385
  5. John Ewalt, M.D.Internal Medicine Physician1518923283
  6. Amy Fothergill, M.D.Internal Medicine Physician1063646370

Verify Casey Ann Birschbach in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
Open the Wisconsin license search

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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.

  1. Casey Birschbach1,609
  2. Specialty average3,176

Most prescribed

  1. Losartan Potassium80 claims
  2. Amlodipine Besylate76 claims
  3. Levothyroxine Sodium72 claims
  4. Atorvastatin Calcium71 claims
  5. Lisinopril44 claims
  6. 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

  1. 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.

Other internal medicine physician records in Wisconsin

  1. Sheetal Aatrai, MDMarshfield, WI1417568965
  2. Khalid Abdelgadir, MDManitowoc, WI1407433295
  3. Mesfin Abdissa, MDMilwaukee, WI1376579417
  4. Anas Abed, MDMadison, WI1659002566
  5. Margaret Abel, MDRhinelander, WI1477590487
  6. Mesfin Abera, M.D.Beaver Dam, WI1972852390
  7. Vidthya Abraham, M.D.Madison, WI1861836058
  8. Ismael Abu Limon, MDGreenfield, WI1467945543
  9. Amjed Abu Muhanna, MDMarinette, WI1861514135
  10. Satish Achanti, MDAppleton, WI1982711198

Common questions

What is Casey Ann Birschbach, MD's NPI number?

Casey Ann 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 Ann 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 Ann 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 Ann Birschbach, MD prescribe under Medicare Part D?

In 2024, Casey Ann 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), 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.