Christal Y. Nishikawa, MD

Medicare activity in 2024

Official CMS public-use data for Christal Y. Nishikawa, 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 low level od decision making, if using time, 20 minutes or more (99213)284 services
2. Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)74 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)33 services
4. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)22 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)14 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 cholesterol70%
• Diabetes36%
• Arthritis36%
• Ischemic heart disease34%
• Chronic kidney disease31%

Hospitals where Christal Y. Nishikawa works

Medicare's Facility Affiliation Data lists Christal Y. Nishikawa 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.

• Oroville HospitalOroville, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050030

Practice locations

Addresses where Christal Y. Nishikawa is enrolled with Medicare (CMS data updated October 2, 2026).

• 2767 Olice HwyOroville, CA 95966
• 2767 Olive HwyOroville, CA 95966 (530) 532‑8544

Group practices

Medicare enrollment lists Christal Y. Nishikawa as a member of this group (CMS data updated October 2, 2026).

• Orohealth Corporation a Non Profit Healthcare System120 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Oroville

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

• Socheat Cheam, DO
• Ardavan Afrasiabi, MD
• Robert Abbott, DO
• Sidharth Bagga, MD
• Andrew Le, DO
• Charles A. Garretson, MD
• Marytere Carrasquillo Navarro, MD
• Phuc D. Tran Sr., DO

All internal medicine doctors in Oroville →

Other clinicians in Orohealth Corporation a Non Profit Healthcare System

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

• Socheat Cheam, DO
• Ardavan Afrasiabi, MD
• Randell S. Skau, MD
• Matthew J. Bazzani, MD
• Daniel E. Link, MD
• Brian T. Ching, 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