Walter Marbach, MD
NPI 1891703591 · Rheumatology Physician · Crestwood, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter Marbach, MD is a Rheumatology Physician provider in Crestwood, IL (NPI 1891703591).
Provider details
- NPI number
- 1891703591
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-057150 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,563 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 1,013 | $64 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 289 | $132 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 244 | $73 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 161 | $29 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 151 | $93 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 144 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 36 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 204 | 48 |
| Hydroxychloroquine Sulfate | 140 | 31 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 123 | 18 |
| Prednisone | 108 | 31 |
| Azathioprine | 73 | 16 |
| Alprazolam | 65 | — |
| Meloxicam |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$953 across 35 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-04
- Last updated
- 2015-05-13
Frequently asked questions
- What is Walter Marbach's NPI number?
- Walter Marbach's National Provider Identifier (NPI) is 1891703591, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter Marbach's specialty?
- Walter Marbach is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Walter Marbach located?
- Walter Marbach's practice location on file with NPPES is 13755 Cicero Ave, Crestwood, IL 60445-1824.
- What is Walter Marbach's phone number?
- The practice phone number listed in the NPPES registry for Walter Marbach is (888) 220-6432.
- Does Walter Marbach accept Medicare?
- Walter Marbach is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walter Marbach's NPI active?
- Yes — Walter Marbach's NPI (1891703591) is active in the NPPES registry as of the last update on 2015-05-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.