Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Dermatology Associates of Siouxland, PC

Specialist in Sioux City, IA · enumerated 2007 · authorized official J. Mark Demay, Dermatologist.

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

National Provider Identifier

1417088907

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Registry record

Entity type Organization (Type 2)

Legal business name Dermatology Associates of Siouxland, PC

Other name <Unavail>

Practice address 2930 Hamilton Blvd, Ste. 102, Sioux City, IA, 51104

Phone (712) 277-9370

Fax (712) 252-4733

Enumeration date Mar 8, 2007

Last updated in NPPES Aug 17, 2016

Taxonomy & classification

174400000X Specialist Other Service Providers · License 31906 (IA) Primary

Authorized official

Name J. Mark Demay

Title Dermatologist

Phone (712) 277-9370

Other identifiers

Identifier	Type	State	Issuer
1417088907	Other	IA	WELLMARK BLUE CROSS & BLUE SHIELD GROUP NPI
IB2763	Other	IA	MEDICARE GROUP PTAN
DT7736	Other	IA	MEDICARE RR GROUP PTAN

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 type of organization is Dermatology Associates of Siouxland, PC?

Dermatology Associates of Siouxland, PC is registered in NPPES as a Specialist (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

Browse all →

John Demay Dermatology Physician · Sioux City, IA NPI 1366447294 David Grote Medical Physician Assistant · Sioux City, IA NPI 1164465019 Tod Knopik General Practice Dentistry · Sioux City, IA NPI 1154332450

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-17.