Chang S. Joo, MD

Medicare activity in 2024

Official CMS public-use data for Chang S. Joo, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)374 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)238 services
3. Dialysis services, 4 or more physician visits per month (20 years or older) (90960)190 services
4. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)163 services
5. Dialysis services, 2-3 physician visits per month (20 years or older) (90961)117 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%
• Chronic kidney disease75%
• Diabetes64%
• Arthritis50%
• Ischemic heart disease43%

Hospitals where Chang S. Joo works

Medicare's Facility Affiliation Data lists Chang S. Joo 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.

• Doctors Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050464
• Emanuel Medical CenterTurlock, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050179
• Memorial Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050557
• Oak Valley Hospital DistrictOakdale, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050067

Practice locations

Addresses where Chang S. Joo is enrolled with Medicare (CMS data updated October 2, 2026).

• 305 E Granger Ave, Suite 202Modesto, CA 95350 (209) 526‑1606

Group practices

Medicare enrollment lists Chang S. Joo as a member of this group (CMS data updated October 2, 2026).

• Modesto Kidney Medical Group5 clinicians in the group

Specialties

• Nephrologyprimary
• Internal Medicinealso

Find other Nephrology doctors in California →

Other nephrologists in Modesto

Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.

• Meenal A. Shah, MD
• Sukhdip K. Kang, MD
• Han-Cheng Chen, DO
• Ronak C. Shah, MD
• Ravikiran Vegasana, MD
• Sithu Lin, MD
• Laide Jinadu, MD
• Swarna Byri, MD

All nephrologists in Modesto →

Other clinicians in Modesto Kidney Medical Group

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

• Han-Cheng Chen, DO
• Yuqiang Ge, 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