Margaret Sullivan, MD

Medicare activity in 2024

Official CMS public-use data for Margaret Sullivan, 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 moderate level of decision making, if using time, 30 minutes or more (99214)402 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)289 services
3. Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)144 services
4. Injection, octafluoropropane microspheres, per ml (Q9956)77 services
5. Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional (99211)57 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%
• Ischemic heart disease46%
• Heart failure37%
• Diabetes36%

Hospitals where Margaret Sullivan works

Medicare's Facility Affiliation Data lists Margaret Sullivan 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.

• Baylor Scott & White Heart & Vascular Hospital - DallasDallas, TX · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 450851
• Ennis Regional Medical CenterEnnis, TX · Acute Care Hospital · Emergency services: listed by Medicare · CCN 450833

Practice locations

Addresses where Margaret Sullivan is enrolled with Medicare (CMS data updated October 2, 2026).

• 2201 W Lampasas StEnnis, TX 75119 (972) 875‑0900
• 802 W Lampasas StEnnis, TX 75119 (972) 875‑4700

Group practices

Medicare enrollment lists Margaret Sullivan as a member of this group (CMS data updated October 2, 2026).

• Texas Specialty Physicians64 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary

Find other Cardiovascular Disease (Cardiology) doctors in Texas →

Other cardiologists in Texas

Clinicians with the same Medicare primary specialty in Texas — not a recommendation.

• Marc S. Shalek, MD
• Kelly Shum, MD
• Wafi Momin, DO
• Annika S. Illum, MD
• Mohammed Chamsi Pasha, MD
• Rodolfo P. Sotolongo, MD
• Don Pham, MD
• Javid Alakbarli, MD

All cardiologists in Texas →

Other clinicians in Texas Specialty Physicians

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

• Patrick Rushford, MD
• Mark S. Hill, MD
• Sherry E. McIlwain, NP
• Candice M. Buckles, DO
• Delores G. Cook, NP
• Amy Sheridan, NP

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