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Compare the published Medicare service mix of Mark Chan with clinicians in the same registry specialty: Physician Assistant (CMS).

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.

Jonathan Kajohn

Specialty details in registry · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
89%Service-mix similarityView profile →

Diana Tran, PA-C

Specialty details in registry · Tracy, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
89%Service-mix similarityView profile →

Xavier Fernando Varela, PA-C

Specialty details in registry · Riverside, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
89%Service-mix similarityView profile →

Ada Wei Hsin Lien, PA-C, MPH

Physician Assistant (CMS) · San Leandro, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
89%Service-mix similarityView profile →

Tameem Hazem Sabry, PA-C

Physician Assistant (CMS) · Fontana, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
88%Service-mix similarityView profile →

Skylar Golden James, PHYSICIAN ASSISTANT

Physician Assistant (CMS) · Oakland, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
88%Service-mix similarityView profile →

Bryan Malcolm, PA

Specialty details in registry · Travis Afb, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
88%Service-mix similarityView profile →

Caleb Paul Roe, PA

Specialty details in registry · Ventura, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
86%Service-mix similarityView profile →

Jessica Lynne Bugbee, PAC

Physician Assistant (CMS) · Placerville, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
82%Service-mix similarityView profile →

Aide Brito-Nadjmabadi, PA-C

Specialty details in registry · Bakersfield, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
81%Service-mix similarityView profile →

Sofia Carmen Bustillo

Physician Assistant (CMS) · Seal Beach, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
81%Service-mix similarityView profile →

Brooke Morrison, PA-C

Specialty details in registry · Eureka, CA

Shared published services
3 shared services · view billing descriptions
  • Emergency department visit with high level of medical decision making (99285)
  • Emergency department visit with moderate level of medical decision making (99284)
  • Emergency department visit with low level of medical decision making (99283)
81%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.