Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Mark W Fox MD PC

Neurological Surgery Physician in Sioux Falls, SD · enumerated 2008 · authorized official Mark Fox, Owner.

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

National Provider Identifier

1366613473

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Registry record

Entity type Organization (Type 2)

Legal business name Mark W Fox MD PC

Practice address 1100 E 21st St, Suite 220, Sioux Falls, SD, 57105

Phone (605) 322-4825

Fax (605) 322-4826

Enumeration date Mar 17, 2008

Last updated in NPPES Jul 18, 2008

Taxonomy & classification

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Mark Fox

Title Owner

Phone (605) 322-4825

Other identifiers

Identifier	Type	State	Issuer
63D15FO	Other	SD	BLUE SHIELD OF MN

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.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-07-18. Verify at npiregistry.cms.hhs.gov.

Where is Mark W Fox MD PC located?

The practice location on file with NPPES is in Sioux Falls, SD.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-07-18.