Nicholas J. Ruys, MD

Medicare activity in 2024

Official CMS public-use data for Nicholas J. Ruys, 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.

Most frequent services

1. Continuous infusion of anesthetic agent and/or steroid into thigh nerve (femoral nerve) through catheter (64448)29 services
2. Anesthesia for procedure for total knee joint replacement (01402)28 services
3. Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)21 services
4. Other procedure on nervous system (64999)18 services
5. Anesthesia for other procedure on urinary system through urethra (00910)15 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%
• Arthritis63%
• Chronic kidney disease29%
• Anxiety28%
• Atrial fibrillation28%

Hospitals where Nicholas J. Ruys works

Medicare's Facility Affiliation Data lists Nicholas J. Ruys 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.

• Oconomowoc Memorial HospitalOconomowoc, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520062
• Waukesha Memorial HospitalWaukesha, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520008

Practice locations

Addresses where Nicholas J. Ruys is enrolled with Medicare (CMS data updated October 2, 2026).

• 725 S American AveWaukesha, WI 53188 (262) 544‑2011

Group practices

Medicare enrollment lists Nicholas J. Ruys as a member of this group (CMS data updated October 2, 2026).

• Anex, S.C.38 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Wisconsin →

Other anesthesiologists in Waukesha

Clinicians with the same Medicare primary specialty in Waukesha, WI — not a recommendation.

• Magnolia C. Printz, MD
• Amanda M. McQueen Klein, MD
• Marina I. Polianska, MD
• Eric R. Wohlfeil, MD
• William M. Stewart, MD
• Francisco Perez, MD
• Robyn L. Dwan, MD
• Sarah R. Kesavabhotla, MD

All anesthesiologists in Waukesha →

Other clinicians in Anex, S.C.

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Magnolia C. Printz, MD
• Amanda M. McQueen Klein, MD
• Marina I. Polianska, MD
• Eric R. Wohlfeil, MD
• William M. Stewart, MD
• Angela M. Zeng, MD

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians