Mark D. Siegel, MD

Medicare activity in 2024

Official CMS public-use data for Mark D. Siegel, 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. Critical care, first 30-74 minutes (99291)36 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)35 services
3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)24 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)17 services
5. Test to measure rate of airflow (94375)13 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%
• Arthritis59%
• COPD54%
• Ischemic heart disease51%
• Heart failure49%

Hospitals where Mark D. Siegel works

Medicare's Facility Affiliation Data lists Mark D. Siegel 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.

• Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070022

Practice locations

Addresses where Mark D. Siegel is enrolled with Medicare (CMS data updated October 2, 2026).

• 789 Howard AveNew Haven, CT 06519 (203) 688‑2471

Group practices

Medicare enrollment lists Mark D. Siegel as a member of this group (CMS data updated October 2, 2026).

• Yale University2,645 clinicians in the group

Specialties

• Pulmonary Diseaseprimary
• Critical Care (Intensivists)also

Find other Pulmonary Disease doctors in Connecticut →

Other pulmonologists in New Haven

Clinicians with the same Medicare primary specialty in New Haven, CT — not a recommendation.

• Jonathan Koff, MD
• Denyse D. Lutchmansingh, MD
• Shyoko Honiden, MD
• Kyle T. Bramley, MD
• Brian J. Clark, MD
• Seyedtaghi Takyar, MD
• John L. Davis Jr., MD
• Jacqueline H. Geer, MD

All pulmonologists in New Haven →

Other clinicians in Yale University

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

• Thomas Laux, MD
• Beth L. Morgan
• Alisa Rybkin
• Elisabeth Makubika
• Lisa L. Lattanza, MD
• Fatima Zeba, 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