Zachary C. Lum, DO

Medicare activity in 2024

Official CMS public-use data for Zachary C. Lum, 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. Injection, methylprednisolone acetate, 1 mg (J1010)1,112 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)144 services
3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)111 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)88 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)78 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).

• Arthritis75%
• High cholesterol72%
• High blood pressure71%
• Diabetes26%
• Depression26%
• Ischemic heart disease24%

Hospitals where Zachary C. Lum works

Medicare's Facility Affiliation Data lists Zachary C. Lum 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.

• Sierra Nevada Memorial HospitalGrass Valley, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050150
• University of California Davis Medical CenterSacramento, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050599

Practice locations

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

• 1535 River Park Dr, Suite 2000Sacramento, CA 95815 (916) 286‑1080
• 2315 Stockton BlvdSacramento, CA 95817
• 4860 Y StSacramento, CA 95817
• 4861 Y StSacramento, CA 95817 (916) 734‑2525
• 4868 X StSacramento, CA 95817

Group practices

Medicare enrollment lists Zachary C. Lum as a member of these groups (CMS data updated October 2, 2026).

• Regents of the Univ of Ca1,584 clinicians in the group
• Regents of the University of California567 clinicians in the group

Specialties

• Orthopedic Surgeryprimary

Find other Orthopedic Surgery doctors in California →

Other orthopedic surgeons in Sacramento

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

• Kent P. Sheridan, MD
• Parker B. Goodell, MD
• Alexandra Ernst, MD
• David M. Broderick, MD
• Jacob H. Fennessy, MD
• John McKeon, MD
• Tennyson L. Block, MD
• Amanda Anderson, MD

All orthopedic surgeons in Sacramento →

Other clinicians in Regents of the Univ of Ca

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

• Gary Stock, CNA
• Kristen H. Lee, MD
• Aman K. Parikh, MD
• Hugh B. Black, MD
• Adrienne Atencio, MD
• Venkat Tirumala, 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