Nina Wagner Johnston, MD

Medicare activity in 2024

Official CMS public-use data for Nina Wagner Johnston, 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. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)211 services
2. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)133 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)101 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)31 services
5. Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or (G2212)26 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 cholesterol70%
• High blood pressure66%
• Arthritis49%
• Ischemic heart disease30%
• Atrial fibrillation25%
• Anxiety24%

Hospitals where Nina Wagner Johnston works

Medicare's Facility Affiliation Data lists Nina Wagner Johnston 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.

• Sibley Memorial HospitalWashington, DC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 090005
• 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 Nina Wagner Johnston is enrolled with Medicare (CMS data updated October 2, 2026).

• 5255 Loughboro Rd NWWashington, DC 20016 (202) 537‑4000
• 600 N Wolf StBaltimore, MD 21287 (410) 955‑5000
• 8600 Old Georgetown RdBethesda, MD 20814 (301) 896‑3100

Group practices

Medicare enrollment lists Nina Wagner Johnston as a member of these groups (CMS data updated October 2, 2026).

• Johns Hopkins University2,909 clinicians in the group
• Johns Hopkins University197 clinicians in the group

Specialties

• Hematology/Oncologyprimary

Find other Hematology/Oncology doctors in District of Columbia →

Other hematologist-oncologists in Washington

Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.

• Ami A. Chitalia, MD
• Chul Kim, MD
• Andrew D. Campbell, MD
• Sarah Waheed, MD
• Craig Kessler, MD
• Salem Kim, MD
• Candace B. Mainor, MD
• Karan Jatwani, MD

All hematologist-oncologists in Washington →

Other clinicians in Johns Hopkins University

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

• Vincent K. Lam, MD
• Samantha Roche, MD
• Syed Abbas Ali, MD
• Richard W. Davis, CNA
• Janis M. Taube, MD
• Valerie Lee, 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