Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Marsha Horwitz, M.D.
Neurology Physician in Dubuque, IA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1992757553
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Registry record
Entity type Individual (Type 1)
Name Marsha Horwitz
Credential M.D.
Sex Female
Practice address 1000 Langworthy St, Dubuque, IA, 52001
Phone (563) 584-3495
Fax (563) 584-3395
Enumeration date May 16, 2006
Last updated in NPPES Jan 12, 2011
Taxonomy & licenses
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 |
|---|---|---|---|
| 0217026 | Medicaid | IA | - |
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.
Frequently asked questions
Is NPI 1992757553 active?
Yes, as of the latest NPPES snapshot, NPI 1992757553 is active (record last updated 2011-01-12).
How do I verify Marsha Horwitz's NPI record?
Cross-check NPI 1992757553 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → 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 2011-01-12.