Quick answers
- Does Marianna B. Ruzinova accept Medicare assignment?
- Yes. Medicare's clinician data says Marianna B. Ruzinova accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marianna B. Ruzinova see?
- In 2024, CMS data shows 278 Original Medicare patients and 3,222 services for Marianna B. Ruzinova. This counts Original Medicare only and measures volume, not quality.
- What is Marianna B. Ruzinova's NPI number?
- 1194917278. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marianna B. Ruzinova, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 278 |
|---|---|
| Services billed to Medicare | 3,222 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Special stained specimen slides to examine tissue, each additional procedure (88341)712 services
- Special stained specimen slides to examine tissue including interpretation and report (88313)445 services
- Evaluation of specimen enzymes (88319)351 services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)342 services
- Microscopic genetic analysis of tumor, manual (88360)252 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Ischemic heart disease37%
- Chronic kidney disease35%
- Anxiety32%
Hospitals where Marianna B. Ruzinova works
Medicare's Facility Affiliation Data lists Marianna B. Ruzinova at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260032
- Barnes-Jewish St Peters HospitalSaint Peters, MO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 260191
- Barnes-Jewish West County HospitalCreve Coeur, MO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 260162
- Christian Hospital NortheastSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260180
- Memorial HospitalBelleville, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140185
Practice locations
Addresses where Marianna B. Ruzinova is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Barnes Jewish Hospital Plz, Fl 3Saint Louis, MO 63110 (314) 362‑5641
Group practices
Medicare enrollment lists Marianna B. Ruzinova as a member of this group (CMS data updated October 2, 2026).
- Washington University3,029 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in Washington University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194917278 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians