NPPES file of Aug 9, 2026

Arthur Mark Altbuch, M.D.

Geriatric Medicine (Family Medicine) Physician · Janesville, WI

Arthur Mark Altbuch, M.D. is a geriatric medicine (family medicine) physician with a practice address in Janesville, Wisconsin, and NPI 1821021429, issued on Jul 8, 2006. Check the license (Wisconsin 41950, as entered in NPPES) 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
1821021429
Name
Arthur Mark Altbuch
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Family Medicine) Physician 207QG0300X
License numbers
41950 WI
30493 FL
30494 FL
Self-reported in NPPES; status is on the state search
Practice location
849 Kellogg Ave, Janesville, WI 53546
Phone
(608) 755-7960
Enumerated
Jul 8, 2006
Record last updated
Mar 7, 2023
Medicaid ID
32631600 WI
Medicare enrollment
Enrolled (PECOS I20040903001225); accepts Medicare assignment
Medical or professional school
Albany Medical College Of Union University, 1976
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 849 Kellogg Ave

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

  1. Raphael Agbavitor, MDStudent in an Organized Health Care Education/Training Program1538009212
  2. Fayyaz Ahmed, MDFamily Medicine Physician1760273049
  3. Melissa Amertil, MDStudent in an Organized Health Care Education/Training Program1174814859
  4. Jane Anderson, MDFamily Medicine Physician1942220140
  5. Sama AzeezStudent in an Organized Health Care Education/Training Program1679400915
  6. Meryum Baig, MDStudent in an Organized Health Care Education/Training Program1750107579

Verify Arthur Mark Altbuch in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 41950    Check 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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97% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024

162 Medicare Part D claims for 47 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.

  1. Arthur Altbuch162
  2. Specialty average5,222

Most prescribed

  1. Atorvastatin Calcium11 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. Mercy Health System CorporationJanesville, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Geriatric Medicine (Family Medicine) Physician providers in Wisconsin

There are 17 geriatric medicine (family medicine) physician records in Wisconsin.

All 17 in Wisconsin → Every provider in Janesville →

Other geriatric medicine (family medicine) physician records in Wisconsin

  1. Abisoye Adebayo, MDAppleton, WI1942720727
  2. John Barkmeier, MDMenasha, WI1386676062
  3. Jean FrizzellWest Bend, WI1871675603
  4. Irene Hamrick, MDFitchburg, WI1801888623
  5. Sarwat Jabeen, M.D.Marinette, WI1710186705
  6. Marcie Janz, APNPFond Du Lac, WI1164415634
  7. Shayna Kamin, DOAppleton, WI1609281567
  8. David Rebedew, MDMonroe, WI1184966509
  9. Melissa Ricker-Bouche, MDSun Prairie, WI1184253775
  10. Tracy Sherman, M.D.Two Rivers, WI1437373586

Common questions

What is Arthur Mark Altbuch, M.D.'s NPI number?

Arthur Mark Altbuch, M.D.'s National Provider Identifier (NPI) is 1821021429, issued on Jul 8, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Arthur Mark Altbuch, M.D. located?

The NPPES record lists a practice address at 849 Kellogg Ave, Janesville, WI, 53546. Phone: (608) 755-7960. Providers update this record themselves, so call before visiting.

How can I verify Arthur Mark Altbuch, M.D.'s license?

NPPES lists Wisconsin license number 41950, 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 Arthur Mark Altbuch, M.D. prescribe under Medicare Part D?

In 2024, Arthur Mark Altbuch, M.D. had 162 Medicare Part D claims for 47 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.