Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Grant Sizemore, M.D.

Surgery Physician in Dubuque, IA · enumerated 2015.

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

National Provider Identifier

1942682281

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Registry record

Entity type Individual (Type 1)

Name Dr. Grant Sizemore

Credential M.D.

Sex Male

Practice address 1000 Langworthy St, Dubuque, IA, 52001

Phone (563) 584-3450

Fax (563) 584-3171

Enumeration date Jun 23, 2015

Last updated in NPPES Jun 29, 2026

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License MD-56679 (IA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

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.

What specialty is Grant Sizemore?

Grant Sizemore is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Marc Dicklin Physician Assistant · Dubuque, IA NPI 1205837408 Rebecca Watts Family Medicine Physician · Dubuque, IA NPI 1245217223 Ryan Stille Family Medicine Physician · Dubuque, IA NPI 1083694681 Martin Bagby Family Medicine Physician · Dubuque, IA NPI 1942269402 Karen Scott Neonatal-Perinatal Medicine Physician · Dubuque, IA NPI 1447210562 Kevin Mullen Pediatrics Physician · Dubuque, IA NPI 1710942701 Paula Aston Neurology Physician · Dubuque, IA NPI 1144286675 Katy Wethal Family Nurse Practitioner · Dubuque, IA NPI 1699732529

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-29.