A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of Christopher Bray Shaffer, M.D. with clinicians in the same registry specialty: Anesthesiology.

CA · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Tobechi Okoronkwo, M.D.

Anesthesiology · Oakland, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
85%Service-mix similarityView profile →

Joseph Thomas Nitti, MD

Anesthesiology · Encino, CA

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for procedure for total knee joint replacement (01402)
77%Service-mix similarityView profile →

Andrew Ding

Anesthesiology · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
75%Service-mix similarityView profile →

Zakir Rangwala, MD

Anesthesiology · Torrance, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
74%Service-mix similarityView profile →

Kevin Nash, MD

Anesthesiology · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Insertion of artery tube for blood sampling or infusion through skin (36620)
73%Service-mix similarityView profile →

Mark Seth Christofferson, MD

Anesthesiology · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Insertion of artery tube for blood sampling or infusion through skin (36620)
73%Service-mix similarityView profile →

Oren Erlichman, M.D.

Anesthesiology · Davis, CA

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Insertion of artery tube for blood sampling or infusion through skin (36620)
71%Service-mix similarityView profile →

Derek Joseph Gee, M.D.

Anesthesiology · San Francisco, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Insertion of artery tube for blood sampling or infusion through skin (36620)
  • Anesthesia for other procedure on upper abdomen (00790)
70%Service-mix similarityView profile →

Mark-Neil Ledesma, M.D.

Anesthesiology · Temecula, CA

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on upper abdomen (00790)
70%Service-mix similarityView profile →

Mark R Logvin, M.D.

Anesthesiology · Folsom, CA

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on upper abdomen (00790)
69%Service-mix similarityView profile →

Li M. Tsang, MD

Anesthesiology · Vallejo, CA

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for procedure for total knee joint replacement (01402)
69%Service-mix similarityView profile →

Qing Wang, MD

Anesthesiology · San Jose, CA

Shared published services
3 shared services · view billing descriptions
  • Ultrasonic guidance for blood vessel access (76937)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for procedure for total knee joint replacement (01402)
68%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.