Zachary L. Nichols, DO

Medicare activity in 2024

Official CMS public-use data for Zachary L. Nichols, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)731 services
2. Hospital discharge day management, more than 30 minutes (99239)389 services
3. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)296 services
4. Critical care, first 30-74 minutes (99291)205 services
5. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)167 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%
• Arthritis52%
• COPD40%
• Diabetes38%
• Ischemic heart disease36%

Hospitals where Zachary L. Nichols works

Medicare's Facility Affiliation Data lists Zachary L. Nichols 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.

• Adventist Health SonoraSonora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050335
• Doctors Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050464
• Memorial Medical CenterModesto, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050557

Practice locations

Addresses where Zachary L. Nichols is enrolled with Medicare (CMS data updated October 2, 2026).

• 1000 Greenley RdSonora, CA 95370 (209) 536‑5000

Group practices

Medicare enrollment lists Zachary L. Nichols as a member of this group (CMS data updated October 2, 2026).

• Galen Inpatient Physicians PC1,077 clinicians in the group

Specialties

• Hospitalistprimary
• Internal Medicinealso

Find other Hospitalist doctors in California →

Other hospitalists in Sonora

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

• Michael B. Hajduk, MD
• Arturo Alvarez Antezana, MD
• Kevin Gandhi, DO
• Sanjay Udani, MD
• Jay Vithalani, MD
• Caroline Nyamweya Tekes, DO
• Daniel C. Meador, MD
• Rohin Dhir

All hospitalists in Sonora →

Other clinicians in Galen Inpatient Physicians PC

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

• Joseph Levay, DO
• Jahangir M. Hossain, MD
• Tracy J. Upton, MD
• Michael B. Azarkh, MD
• Chelsea A. McCoy, DO
• Nur Mando, 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