Ana Lopez Osullivan, MD

Medicare activity in 2024

Official CMS public-use data for Ana Lopez Osullivan, 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. Emergency department visit with high level of medical decision making (99285)166 services
2. Emergency department visit with moderate level of medical decision making (99284)89 services
3. Electrocardiogram (ecg) 1 to 3 leads with review by physician only (93042)80 services
4. Critical care, first 30-74 minutes (99291)77 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)11 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%
• Arthritis49%
• Diabetes42%
• Chronic kidney disease39%
• Ischemic heart disease33%

Hospitals where Ana Lopez Osullivan works

Medicare's Facility Affiliation Data lists Ana Lopez Osullivan 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.

• Rex HospitalRaleigh, NC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 340114

Practice locations

Addresses where Ana Lopez Osullivan is enrolled with Medicare (CMS data updated October 2, 2026).

• 4420 Lake Boone TrlRaleigh, NC 27607 (919) 784‑3100
• 850 S Main StHolly Springs, NC 27540 (919) 784‑3100

Group practices

Medicare enrollment lists Ana Lopez Osullivan as a member of this group (CMS data updated October 2, 2026).

• Raleigh Emergency Medicine Associates Inc29 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in North Carolina →

Other emergency medicine doctors in Raleigh

Clinicians with the same Medicare primary specialty in Raleigh, NC — not a recommendation.

• Amy H. Williams, MD
• Randolph N. Brown, MD
• Robert A. Dilorenzo, MD
• Richard K. Carmona, MD
• Robert D. Hagan Jr., DO
• Christine T. Knettel
• Erik A. Manring, MD
• Kenneth J. Michau, MD

All emergency medicine doctors in Raleigh →

Other clinicians in Raleigh Emergency Medicine Associates Inc

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

• Robert A. Dilorenzo, MD
• Richard K. Carmona, MD
• John D. Lilley, MD
• Kathleen A. Glass, NP
• Christian H. Simpson, MD
• Jonathan A. Hancher, 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