Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Warren Fox, MD

Neurological Surgery Physician in Sioux Falls, SD · enumerated 2006.

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

National Provider Identifier

1750355236

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Registry record

Entity type Individual (Type 1)

Name Mark Warren Fox

Credential MD

Sex Male

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

Phone (605) 322-4825

Fax (605) 322-4826

Enumeration date Feb 14, 2006

Last updated in NPPES Jan 15, 2009

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 4319 (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
320715300	Medicaid	MN	-
4319	Other	SD	DAKOTACARE
57105AU02	Other	SD	WPS TRICARE
63D16FO	Other	MN	CC SYSTEMS/BLUE PLUS FOR DATES PRIOR TO 9-1-07
1750355236	Other	SD	ARAZ/ AMERICA'S PPO
0600325	Other	SD	MEDICA
231714	Other	SD	MIDLANDS CHOICE
46L94FO	Other	MN	CC SYSTEMS/BLUE PLUS
C83121001265	Other	-	PREFERRED ONE
6100533	Medicaid	SD	-
10025562500	Medicaid	NE	-
4992870	Other	SD	BLUE CROSS
HP13310	Other	SD	HEALTHPARTNERS

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

What specialty is Mark Fox?

Mark Fox is registered in NPPES with the primary taxonomy of Neurological Surgery 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 2009-01-15.