Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Melissa Nichole Holtz, MD

Obstetrics & Gynecology Physician in Sioux City, IA · enumerated 2007 · practices at Siouxland Obstetrics & Gynecology, P.C..

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

National Provider Identifier

1427254002

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Registry record

Entity type Individual (Type 1)

Name Dr. Melissa Nichole Holtz

Credential MD

Sex Female

Practice address 2730 Pierce St Ste 201, Sioux City, IA, 51104

Phone (712) 277-3141

Fax (712) 277-2645

Enumeration date Jun 21, 2007

Last updated in NPPES Oct 18, 2022

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 39393 (IA) 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
1427254002	Medicaid	IA	-
IB2715001	Other	-	MEDICARE PTAN
1427254002	Medicaid	NE	-
1427254002	Medicaid	SD	-
P01198031	Other	-	MEDICARE PTAN RAILROAD

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 Melissa Holtz?

Melissa Holtz is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology 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.

Other providers at this practice address

Browse all →

Tauhni Hunt Obstetrics & Gynecology Physician · Sioux City, IA NPI 1962409862 Paul Eastman Obstetrics & Gynecology Physician · Sioux City, IA NPI 1295732139 Siouxland Obstetrics & Gynecology, P.C. Obstetrics & Gynecology Physician · Sioux City, IA NPI 1134250939 Chandler Kasuske Obstetrics & Gynecology Physician · Sioux City, IA NPI 1831684992 Emily Oberle Obstetrics & Gynecology Physician · Sioux City, IA NPI 1265057533

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-10-18.