Rena R. Xian, MD

Medicare activity in 2024

Official CMS public-use data for Rena R. Xian, 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. Special stained specimen slides to examine tissue, each additional procedure (88341)307 services
2. Molecular pathology procedure; physician interpretation and report (G0452)255 services
3. Special stained specimen slides to examine tissue including interpretation and report (88313)88 services
4. Pathology examination of tissue using a microscope, intermediate complexity (88305)79 services
5. Preparation of tissue for examination by removing any calcium present (88311)68 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%
• Arthritis50%
• Chronic kidney disease31%
• Diabetes29%
• Ischemic heart disease28%

Hospitals where Rena R. Xian works

Medicare's Facility Affiliation Data lists Rena R. Xian 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.

• Johns Hopkins Bayview Medical CenterBaltimore, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210029
• Sibley Memorial HospitalWashington, DC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 090005
• Suburban HospitalBethesda, MD · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 210022
• The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210009

Practice locations

Addresses where Rena R. Xian is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 4940 Eastern AveBaltimore, MD 21224
• 5755 Cedar LnColumbia, MD 21044 (410) 740‑7890
• 5759 Cedar LnColumbia, MD 21044
• 600 N Wolf StBaltimore, MD 21287
• 600 N Wolfe St, Blalock 266Baltimore, MD 21287 (410) 502‑4340

Group practices

Medicare enrollment lists Rena R. Xian as a member of these groups (CMS data updated October 2, 2026).

• Johns Hopkins University2,909 clinicians in the group
• Johns Hopkins University713 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in Maryland →

Other pathologists in Baltimore

Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.

• Jacqueline Birkness, MD
• Sarayu Chandrashekhar, MD
• Lindsay B. Goicochea, MD
• Rofieda R. Alwaqfi, MD
• Nathan A. Dunsmore, MD
• Philip R. McDowell, MD
• Benjamin Mazer, MD
• Heather M. Ames, MD

All pathologists in Baltimore →

Other clinicians in Johns Hopkins University

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

• Jacqueline Birkness, MD
• Kendall Moseley, MD
• Heather Winger, PA
• Anna B. Gitterman, MD
• Elizabeth L. Daugherty, MD
• Bruce D. Smith, 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