Stephen D. Vaughan, MD

Medicare activity in 2024

Official CMS public-use data for Stephen D. Vaughan, 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 50 minutes (99233)207 services
2. Hospital discharge day management, more than 30 minutes (99239)102 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)97 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)94 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%
• Arthritis51%
• Chronic kidney disease48%
• Ischemic heart disease46%
• Atrial fibrillation45%

Hospitals where Stephen D. Vaughan works

Medicare's Facility Affiliation Data lists Stephen D. Vaughan 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.

• Sequoia HospitalRedwood City, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050197

Practice locations

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

• 170 Alameda De Las PulgasRedwood City, CA 94062 (650) 369‑5811

Group practices

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

• Vituity Hospitalists PC79 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Redwood City

Clinicians with the same Medicare primary specialty in Redwood City, CA — not a recommendation.

• Swati Didonato, MD
• Jasmeen Pombra, MD
• Jonathan H. Chen, MD
• Sally L. Yu, MD
• Kirth Cucueco, MD
• Jenny Torres, MD
• Ami R. Kapadia, MD
• Herbert C. Szeto

All internal medicine doctors in Redwood City →

Other clinicians in Vituity Hospitalists PC

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

• Tatyana L. Reznik, MD
• Michael M. Ngumi, MD
• Justin T. Curran, MD
• Michelle Yen, MD
• Hunter Huang, PA
• Joseph G. Mallon, 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