Dariusz G. Walczak, MD

Medicare activity in 2024

Official CMS public-use data for Dariusz G. Walczak, 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. Anesthesia for other procedure on large bowel using an endoscope (00811)68 services
2. Anesthesia for procedure on small and large bowel using an endoscope (00813)25 services
3. Anesthesia for exam of colon using an endoscope (00812)18 services
4. Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)16 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 pressure62%
• Arthritis43%
• Diabetes26%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)15%
• Anxiety14%

Hospitals where Dariusz G. Walczak works

Medicare's Facility Affiliation Data lists Dariusz G. Walczak 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.

• Valley Medical CenterRenton, WA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 500088

Practice locations

Addresses where Dariusz G. Walczak is enrolled with Medicare (CMS data updated October 2, 2026).

• 400 S 43rd StRenton, WA 98055 (800) 540‑1814

Group practices

Medicare enrollment lists Dariusz G. Walczak as a member of this group (CMS data updated October 2, 2026).

• Valley Anesthesia Associates PLLC44 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Washington →

Other anesthesiologists in Renton

Clinicians with the same Medicare primary specialty in Renton, WA — not a recommendation.

• Carli D. Hoaglan, MD
• Julian H. Broad, MD
• Jenna K. Masters, MD
• Andrew J. Faraci, MD
• David L. Dycus, MD
• Lotanna Obiora, MD
• William Tang, MD
• Pakawadee Khovidhunkit, MD

All anesthesiologists in Renton →

Other clinicians in Valley Anesthesia Associates PLLC

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

• Aaron R. Gonzalez-Birr, CNA
• Carli D. Hoaglan, MD
• Michael A. Grabach, CNA
• Thuy H. Nguyen, CNA
• Pakawadee Khovidhunkit, MD
• David L. Dycus, 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