Nicholas Mahoney, MD

Medicare activity in 2024

Official CMS public-use data for Nicholas Mahoney, 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. Injection, onabotulinumtoxina, 1 unit (J0585)3,900 services
2. Injection, incobotulinumtoxin a, 1 unit (J0588)2,700 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)544 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)96 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)81 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 pressure69%
• Arthritis55%
• Diabetes25%
• Ischemic heart disease25%
• Osteoporosis25%

Hospitals where Nicholas Mahoney works

Medicare's Facility Affiliation Data lists Nicholas Mahoney 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 Nicholas Mahoney is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 10751 Falls RdLutherville, MD 21093
• 1800 Orleans StBaltimore, MD 21287 (410) 955‑5000
• 5255 Loughboro NwrdWashington, DC 20016 (202) 660‑6500
• 600 N Wolf StBaltimore, MD 21287
• 600 N Wolfe St, Blalock 266Baltimore, MD 21287 (410) 502‑4340

Group practices

Medicare enrollment lists Nicholas Mahoney 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

• Ophthalmologyprimary

Find other Ophthalmology doctors in Maryland →

Other ophthalmologists in Lutherville

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

• Bryn M. Burkholder, MD
• Thomas V. Johnson Iii, MD
• Bo Wang, MD
• Uri Soiberman, MD
• Mira Sachdeva, MD
• Kathryn G. Turner, MD
• Everardo Hernandez Quintela, MD
• Cindy Cai, MD

All ophthalmologists in Lutherville →

Other clinicians in Johns Hopkins University

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

• Frederick C. Nucifora Jr., DO
• Bruce W. Huntley, PA
• Louis Chang, MD
• Zoe Fisher, MD
• Dean F. Mackinnon, MD
• Kathryn J. Thomas, CNS

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