Steven B. Machtinger, MD

Medicare activity in 2024

Official CMS public-use data for Steven B. Machtinger, 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. Test for allergy using allergenic extract (95004)903 services
2. Professional service for preparation and provision of 1 or more antigens (95165)600 services
3. Professional service for multiple injections of allergen (95117)207 services
4. Professional service for single injection of allergen (95115)206 services
5. Injection of drug or substance under skin or into muscle (96372)200 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 cholesterol75%
• High blood pressure58%
• Asthma56%
• Arthritis43%
• Anxiety26%
• Osteoporosis25%

Hospitals where Steven B. Machtinger works

Medicare's Facility Affiliation Data lists Steven B. Machtinger 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.

• Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050007
• Sequoia HospitalRedwood City, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050197

Practice locations

Addresses where Steven B. Machtinger is enrolled with Medicare (CMS data updated October 2, 2026).

• 100 S Ellsworth Ave, Suite 707San Mateo, CA 94401 (650) 696‑8230
• 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000

Group practices

Medicare enrollment lists Steven B. Machtinger as a member of these groups (CMS data updated October 2, 2026).

• Regents of the University of California - UCSF80 clinicians in the group
• Steven Machtinger MD and Associates Inc2 clinicians in the group

Specialties

• Allergy/Immunologyprimary

Find other Allergy/Immunology doctors in California →

Other allergist and immunologists in San Mateo

Clinicians with the same Medicare primary specialty in San Mateo, CA — not a recommendation.

• Robert C. Bocian, MD
• Nisha Patel, MD
• Madeleine B. Chollet, MD
• Rajashri S. Iyengar, MD
• Dai Park, MD
• Dean G. Kardassakis, MD
• Erika D. Cherk, MD
• Andrew C. Engler, MD

All allergist and immunologists in San Mateo →

Other clinicians in Regents of the University of California - UCSF

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

• Alexis Gandarilla, PA
• Corbin H. Wirta, PA
• Brooke E. Leonard, AU
• Michael J. Roberts, MD
• Jeffrey J. Lampert, AU
• Dana Feigenbaum, 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