Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Kathleen Bister, M.D.

Family Medicine Physician in Hartford, WI · enumerated 2010.

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

National Provider Identifier

1144546086

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Registry record

Entity type Individual (Type 1)

Name Mary Kathleen Bister

Credential M.D.

Sex Female

Practice address 1640 E Sumner St, Hartford, WI, 53027

Phone (262) 670-4000

Fax (262) 640-4451

Enumeration date Apr 16, 2010

Last updated in NPPES Jul 9, 2026

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 35.123233 (OH) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 86675 (WI) Primary

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
100412525	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

What specialty is Mary Bister?

Mary Bister is registered in NPPES with the primary taxonomy of Family Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-09.