Quick answers
- Does Katherine K. Katsoyannis accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine K. Katsoyannis 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 Katherine K. Katsoyannis see?
- In 2024, CMS data shows 621 Original Medicare patients and 2,106 services for Katherine K. Katsoyannis. This counts Original Medicare only and measures volume, not quality.
- What is Katherine K. Katsoyannis's NPI number?
- 1023123015. 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 Katherine K. Katsoyannis, 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 | 621 |
|---|---|
| Services billed to Medicare | 2,106 |
| Different services or procedures | 47 |
| Participating Medicare provider | Yes |
| Average age of these patients | 84 |
Most frequent services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)479 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)326 services
- Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes (99348)138 services
- Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes (99349)126 services
- Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310)120 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%
- Arthritis62%
- Alzheimer's disease or dementia59%
- Depression51%
- Anxiety45%
Hospitals where Katherine K. Katsoyannis works
Medicare's Facility Affiliation Data lists Katherine K. Katsoyannis 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.
- Advocate Lutheran General HospitalPark Ridge, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140223
- Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140010
- Northwest Community Hospital 1Arlington Heights, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140252
Practice locations
Addresses where Katherine K. Katsoyannis is enrolled with Medicare (CMS data updated October 2, 2026).
- 1221 E Golf RdDes Plaines, IL 60016 (847) 768‑1300
- 1600 W Dempster St, Suite 120Park Ridge, IL 60068 (847) 590‑1500
Group practices
Medicare enrollment lists Katherine K. Katsoyannis as a member of this group (CMS data updated October 2, 2026).
- Geri Care Ltd12 clinicians in the group
Specialties
- Internal Medicineprimary
- Geriatric Medicinealso
Other internal medicine doctors in Des Plaines
Clinicians with the same Medicare primary specialty in Des Plaines, IL — not a recommendation.
Other clinicians in Geri Care Ltd
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 1987 (39 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023123015 |
| 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