Quick answers
- Does Katy M. Stewart accept Medicare assignment?
- Yes. Medicare's clinician data says Katy M. Stewart 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 Katy M. Stewart see?
- In 2024, CMS data shows 166 Original Medicare patients and 369 services for Katy M. Stewart. This counts Original Medicare only and measures volume, not quality.
- What is Katy M. Stewart's NPI number?
- 1437576600. 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 Katy M. Stewart, 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 | 166 |
|---|---|
| Services billed to Medicare | 369 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)179 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)148 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)20 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 cholesterol72%
- High blood pressure70%
- Arthritis49%
- Diabetes33%
- Chronic kidney disease31%
- Ischemic heart disease30%
Hospitals where Katy M. Stewart works
Medicare's Facility Affiliation Data lists Katy M. Stewart 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
Practice locations
Addresses where Katy M. Stewart is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Barnes Jew Hosp PlzSaint Louis, MO 63110 (314) 747‑3000
- 10 Barnes W DrSaint Louis, MO 63141
- 10 Barnes W Dr, 200 Asthma and Allergy Center Wash UnivSt Louis, MO 63141 (314) 996‑8670
- 1418 Cross St, Suite 180Shiloh, IL 62269 (618) 607‑1340
- 4500 Forest Park AveSaint Louis, MO 63108
Group practices
Medicare enrollment lists Katy M. Stewart as a member of these groups (CMS data updated October 2, 2026).
- Washington University3,029 clinicians in the group
- Washington University Physicians in Illinois Inc175 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners 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 | NP |
|---|---|
| School | Saint Louis University School Of Medicine |
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1437576600 |
| 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