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MARSHA HORWITZ M.D.
NPI 1992757553
Psychiatry & Neurology - Neurology in Dubuque, IA

Active since May 16, 2006PECOS Enrolled
1000 LANGWORTHY ST, DUBUQUE, IA 52001(563) 584-3495(563) 584-3395 Get Directions Write a Review

NPPES record last updated: January 12, 2011. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Marsha Horwitz M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARSHA HORWITZ M.D. (NPI 1992757553) is an individual neurology provider in Dubuque, Iowa, licensed in Iowa (33757) and active in the NPI registry since May 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1992757553
Entity TypeIndividualFemale
Primary Taxonomy2084N0400X
Provider Legal NameMARSHA HORWITZCredential: M.D.
Location Address1000 LANGWORTHY STDubuque, IA 52001-7313
Mailing Address1500 Associates DrDubuque, IA 52002-2201 · (563) 584-4100 · Fax (563) 584-4110
Phone(563) 584-3495
Fax(563) 584-3395
Sole ProprietorNo
Enumeration DateMay 16, 2006
Last NPPES UpdateJanuary 12, 2011
✔ NPI 1992757553 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
Licenses✔ Licensed in IA · 33757✔ Licensed in WI · 48570
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
1000 LANGWORTHY ST, Dubuque, IA 52001
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Other Identifiers 3

Medicare ID-Type UnspecifiedI0686IA
Medicare UPIND13938
Medicaid0217026IA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Marsha Horwitz M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Marsha Horwitz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Medical Associates Clinic P C
3.1 mi
Multi-Specialty
1500 ASSOCIATES DR
Dubuque, IA 52002
  • Reassigned Medicare billing, Iowa enrollment
  • 272 clinicians in this Medicare group
NPI 1457300790 (563) 584-4100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 52001 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$122.23 typical visit price
range $52.96 – $161.40
Typical copayment $30.55 (range $13.24 – $40.35)
Most-billed visit code 99204
Established Patient
$94.05 typical visit price
range $16.91 – $131.98
Typical copayment $23.51 (range $4.22 – $32.99)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ALLISON MILLER MD
Internal Medicine (Nephrology)
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3550
LARISSA R DEHNING PA-C
Physician Assistant
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3226
KIM M. EHLERS A.R.N.P.
Nurse Practitioner
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3430
SUSAN G. BUSHMAN A.R.N.P.
Nurse Practitioner
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3480
BRIAN LEO LOC D.O.
Internal Medicine (Cardiovascular Disease)
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3425
REILLY KUHN WOJCIEHOWSKI MD
Family Medicine
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3226
JOSEPH BERNARD FULLER M.D.
Surgery
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3450
THOMAS ANTHONY SINSKY M.D.
Internal Medicine
1000 LANGWORTHY ST
DUBUQUE, IA 52001
Dubuque County (563) 584-3430

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marsha Horwitz's NPI number?

The NPI number for Marsha Horwitz is 1992757553. It was assigned to this individual provider in the NPPES registry on May 16, 2006.

Where is Marsha Horwitz located?

Marsha Horwitz practices at 1000 Langworthy St, Dubuque, IA 52001. The listed phone number is (563) 584-3495.

What is Marsha Horwitz's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

Is Marsha Horwitz enrolled in Medicare?

Yes. Marsha Horwitz is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Marsha Horwitz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marsha Horwitz reassigns Medicare benefits to Medical Associates Clinic P C (Dubuque, IA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marsha Horwitz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Marsha Horwitz was last updated on January 12, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.