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Compare the published Medicare service mix of John Jiwoong Ryu, MD with clinicians in the same registry specialty: Anesthesiology.

WALNUT CREEK, CA · Exact areaEdit location

2024 published service data · 46 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Oscar Fernandez, MD

Anesthesiology · Walnut Creek, CA

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for lens surgery (00142)
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Anesthesia for other procedure on nose and sinuses (00160)
76%Service-mix similarityView profile →

Melissa Louise Ennen, M.D.

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)
46%Service-mix similarityView profile →

John Gainey, MD

Anesthesiology · Walnut Creek, CA

Shared published services
1 shared services · view billing descriptions
  • Anesthesia for lens surgery (00142)
45%Service-mix similarityView profile →

Young Sin Lin, M.D.

Anesthesiology · Walnut Creek, CA

Shared published services
1 shared services · view billing descriptions
  • Anesthesia for lens surgery (00142)
45%Service-mix similarityView profile →

Christopher L Reeves, MD

Anesthesiology · Walnut Creek, CA

Shared published services
1 shared services · view billing descriptions
  • Anesthesia for lens surgery (00142)
45%Service-mix similarityView profile →

Kurt Dieter Dittmar, MD

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)
38%Service-mix similarityView profile →

San Shing Yuan, MD

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)
37%Service-mix similarityView profile →

Julie Yeh, MD

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)
36%Service-mix similarityView profile →

Johannes Gerhard Peters, MD

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)
  • Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)
36%Service-mix similarityView profile →

Kenneth Chou Wong, MD

Anesthesiology · Walnut Creek, CA

Shared published services
2 shared services · view billing descriptions
  • Anesthesia for lens surgery (00142)
  • Anesthesia for procedure on anus and rectum (00902)
30%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.