Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Arthur Mark Altbuch, M.D.

Geriatric Medicine (Family Medicine) Physician in Janesville, WI · enumerated 2006 · practices at Mercy Health System Corporation.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821021429

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Registry record

Entity type Individual (Type 1)

Name Dr. Arthur Mark Altbuch

Credential M.D.

Sex Male

Practice address Janesville, WI, 53546

Phone (608) 755-7960

Enumeration date Jul 8, 2006

Last updated in NPPES Mar 7, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 41950 (WI) Secondary

207QG0300X Geriatric Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 41950 (WI) Secondary

207QS0010X Sports Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 41950 (WI) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 30494 (FL) Secondary

207QG0300X Geriatric Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 30493 (FL) Primary

207QS0010X Sports Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 30494 (FL) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
32631600	Medicaid	WI	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Arthur Altbuch practice?

The practice location on file with NPPES is in Janesville, WI. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Arthur Altbuch?

The National Provider Identifier (NPI) for Arthur Altbuch is 1821021429, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.