Vivian N. Siu, DO

Medicare activity in 2024

Official CMS public-use data for Vivian N. Siu, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)182 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)112 services
3. Hospital discharge day management, more than 30 minutes (99239)32 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)22 services
5. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)17 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%
• Chronic kidney disease72%
• Arthritis66%
• Ischemic heart disease63%
• Diabetes60%

Hospitals where Vivian N. Siu works

Medicare's Facility Affiliation Data lists Vivian N. Siu 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.

• NYU Langone HospitalsNew York, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330214

Practice locations

Addresses where Vivian N. Siu is enrolled with Medicare (CMS data updated October 2, 2026).

• 111 BroadwayNew York, NY 10006 (212) 263‑9700
• 259 1st StMineola, NY 11501

Group practices

Medicare enrollment lists Vivian N. Siu as a member of this group (CMS data updated October 2, 2026).

• New York University6,134 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in New York →

Other internal medicine doctors in New York

Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.

• Kerrianne P. Page, MD
• Tanzina Nawrin, DO
• Tarek Mousa, MD
• Christian O. Miller, MD
• Christine Chang, MD
• Allen Wang, MD
• Gregory M. Spisak, MD
• John E. Poff, MD

All internal medicine doctors in New York →

Other clinicians in New York University

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

• Sandra R. Kuefner
• Stephen Slavin, MD
• Timothy T. Chen, MD
• Roland Gray, MD
• Rachel Tischler
• David Lee, 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