MARSHA HORWITZ (M.D.) – Neurology Physician, NPI 1992757553
Neurology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for MARSHA HORWITZ (M.D.)
Medical Associates Clinic, 1500, Associates Drive, Dubuque, Dubuque County, Iowa, 52002, United States
DUBUQUE, IA 520022201
Phone: (563) 584-4100
Fax: (563) 584-4110
Type: Mailing
Medical Associates Clinic, 1000, Langworthy Street, Dubuque, Dubuque County, Iowa, 52001, United States
DUBUQUE, IA 520017313
Phone: (563) 584-3495
Fax: (563) 584-3395
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $33.
Total Amount is formed as General ($33) + Research ($0) + Ownership ($0) = $33.
Last reported payment date: 2024-09-19 • Largest payer in this snapshot: ARGENX US, INC. ($33).
Total Amount
$33
General + Research + Ownership
Payments
1
Total payment records
General Amount
$33
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-09-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ARGENX US, INC. | $33 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-11-18
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20041118000556 | I | Neurology | IA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 15 | 15 | $0 |
Insurance plans in this area (ZIP 52002)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | IA | |
| - | IA | |
| D E R M A T O L O G Y | WI | |
| Physical Medicine And Rehabilitation | IA | |
| - | IA | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| Nurse Practitioner | IA | |
| - | IA | |
| Physician Assistant | IA | |
| Physical Therapist In Private Practice | IA |
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