Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Miroslaw A Mazurczak, M.D.

Hematology & Oncology Physician in Sioux Falls, SD · enumerated 2005.

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

National Provider Identifier

1437155140

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Registry record

Entity type Individual (Type 1)

Name Miroslaw A Mazurczak

Credential M.D.

Sex Male

Practice address 1309 W 17th St, Ste 101, Sioux Falls, SD, 57104

Phone (605) 328-8000

Fax (605) 328-8001

Enumeration date Jun 27, 2005

Last updated in NPPES Mar 25, 2022

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 4451 (SD) 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
6003705	Medicaid	SD	-

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 Miroslaw Mazurczak?

Miroslaw Mazurczak is registered in NPPES with the primary taxonomy of Hematology & Oncology 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 2022-03-25.