Ronald J. Sweren, MD

Medicare activity in 2024

Official CMS public-use data for Ronald J. Sweren, 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)851 services
2. Therapy procedure using ultraviolet radiation with tar or petroleum jelly application (96910)778 services
3. Destruction of precancer skin growth, 2-14 growths (17003)521 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)433 services
5. Destruction of precancer skin growth, 1 growth (17000)294 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 cholesterol75%
• High blood pressure68%
• Arthritis48%
• Ischemic heart disease28%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)22%
• Diabetes21%

Hospitals where Ronald J. Sweren works

Medicare's Facility Affiliation Data lists Ronald J. Sweren 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.

• 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 Ronald J. Sweren is enrolled with Medicare (CMS data updated October 2, 2026).

• 10755 Falls RdLutherville, MD 21093 (410) 583‑2727

Group practices

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

• Johns Hopkins University2,909 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in Maryland →

Other dermatologists in Lutherville

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

• Elisabeth G. Richard, MD
• Tina R. Nandi, MD
• Nancy Nkansah-Mahaney, MD
• Zain U. Syed, MD
• Saif U. Syed, MD
• Linda C. Wang, MD
• Douglas Buethe, MD
• Howard N. Robinson, MD

All dermatologists in Lutherville →

Other clinicians in Johns Hopkins University

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

• Meagan Bedsaul, NP
• Anna M. Powell, MD
• Pardis Hosseinzadeh, MD
• Angela Llufrio, NP
• Michelle Li, NP
• Rabbia Saeed, 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