Joanna J. Xie, MD

Medicare activity in 2024

Official CMS public-use data for Joanna J. Xie, 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. Pathology examination of tissue using a microscope, intermediate complexity (88305)2,056 services
2. Special stained specimen slides to examine tissue, each additional procedure (88341)661 services
3. Special stained specimen slides to identify organisms including interpretation and report (88312)384 services
4. Special stained specimen slides to examine tissue, initial procedure (88342)327 services
5. Preparation of tissue for examination by removing any calcium present (88311)324 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%
• Arthritis57%
• Diabetes43%
• Ischemic heart disease40%
• Chronic kidney disease36%

Hospitals where Joanna J. Xie works

Medicare's Facility Affiliation Data lists Joanna J. Xie 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.

• St Johns Regional Medical CenterOxnard, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050082

Practice locations

Addresses where Joanna J. Xie is enrolled with Medicare (CMS data updated October 2, 2026).

• 1600 N Rose AveOxnard, CA 93030 (805) 988‑2500
• 2309 Antonio AveCamarillo, CA 93010 (805) 389‑5880

Group practices

Medicare enrollment lists Joanna J. Xie as a member of this group (CMS data updated October 2, 2026).

• Perfect Pathology Medical PC2 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in California →

Other pathologists in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

• Bryan T. Lin, MD
• Roger Chan, MD
• Luke R. Watson, MD
• Jian-Hua Qiao, MD
• Mark Zuckerman, MD
• Lijun Xue, MD
• Jaydeep J. Johal, MD
• Dehua Wang, MD

All pathologists in California →

Other clinicians in Perfect Pathology Medical PC

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

• Bryan T. Lin, 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