Knee replacement volume in San Francisco, California

42 clinicians CMS lists under Orthopedic Surgery, Sports Medicine, or Hand Surgery billed at least one knee replacement in San Francisco in the June 2026 release.

Clinicians

Clinician	Knee replacements billed	Percentile rank
Derek Ward, MD	223	99%
Robert Mayle, MD	159	97%
Peter Callander, MD	136	96%
Erik Hansen, MD	97	91%
Jeffrey Barry, MD	88	89%
John Belzer, MD	68	83%
Christopher Cox, MD	68	83%
Vibhu Banala, MD	62	81%
Arthur Mcdowell, MD	56	78%
Stefano Bini, MD	55	78%
Nicholas Gannon, MD	42	70%
Jennifer Van Warmerdam, MD	42	70%
Michael Feldstein, MD	39	67%
Thomas Barber, MD	38	66%
Brendan Comer, MD	34	63%
Claudio Diaz Ledezma, MD	24	52%
Meir Marmor, MD	18	44%
Christopher Walter, DO	18	44%
David Goltz, MD	17	43%
Patrick Mcgahan, MD	17	43%
Eric Bava, MD	14	38%
Kenneth Akizuki, MD	1-10	32% or below
Afshin Anoushiravani, MD	1-10	32% or below
Dave Atkin, MD	1-10	32% or below
James Chen, MD	1-10	32% or below
Ephraim Dickinson, MD	1-10	32% or below
Kanwaljit Gill, MD	1-10	32% or below
Timothy Kahn, MD	1-10	32% or below
Ajith Malige, MD	1-10	32% or below
Jothi Murali, MD	1-10	32% or below
Kiauntee Murray, MD	1-10	32% or below
Victor Prieto, MD	1-10	32% or below
Robert Purchase, MD	1-10	32% or below
Mark Schrumpf, MD	1-10	32% or below
Daniel Solomon, MD	1-10	32% or below
Robert Teasdale, MD	1-10	32% or below
Paul Toogood, MD	1-10	32% or below
Kudret Usmani, MD	1-10	32% or below
Anthony Wiggins, MD	1-10	32% or below
Nikolaj Wolfson, MD	1-10	32% or below
Rosanna Wustrack, MD	1-10	32% or below
Melissa Zimel, MD	1-10	32% or below

Sorted by the number of knee replacements billed to Medicare, highest first. This is an ordering of one published figure, not a ranking of quality, skill, or outcomes. CMS suppresses counts of 10 and below to protect patient privacy and publishes the range instead, which is not a count of zero; 21 of these clinicians carry that range.

Understanding CMS Data

These figures are based on knee replacements billed to Original Medicare and Medicare Advantage as reported by the Centers for Medicare & Medicaid Services (CMS) in their June 2026 data release. The CMS data doesn't include procedures performed for patients who have other health care coverage (e.g., commercially insured, self pay, or VA). Furthermore, CMS sums up specific billing codes that cover first-time knee replacement, partial knee replacement, and revision of a previous knee replacement to calculate the total number of knee replacements. Billing variation and coding errors could potentially affect CMS's data. Therefore, the knee replacement volume data reported by CMS may be higher or lower than the actual total knee replacements performed by a clinician. We share the total knee replacement figures for the clinicians CMS lists under Orthopedic Surgery, Sports Medicine, or Hand Surgery as CMS publishes them, without alteration.

Source: Centers for Medicare & Medicaid Services (June 2026 release).