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Compare the published Medicare service mix of Sergio R Casillas-Romero, MD. with clinicians in the same registry specialty: Colorectal Surgery (Proctology) (CMS).

CT · Exact areaEdit location

2024 published service data · 35 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Christina Czyrko, M.D.

Colorectal Surgery (Proctology) · General Surgery (CMS) · New Britain, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
85%Service-mix similarityView profile →

Christine Marie Bartus, MD

Colorectal Surgery (Proctology) · General Surgery (CMS) · New Britain, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
81%Service-mix similarityView profile →

Daniel Sylvan Lavy, M.D.

Colorectal Surgery (Proctology) · General Surgery (CMS) · Derby, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
81%Service-mix similarityView profile →

Shahzad Zafar, M.D.

Colorectal Surgery (Proctology) · General Surgery (CMS) · Stamford, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Diagnostic exam of anus using an endoscope (46600)
  • Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)
76%Service-mix similarityView profile →

Stuart Bussell, M.D.

Colorectal Surgery (Proctology) (CMS) · Danbury, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
75%Service-mix similarityView profile →

Marc Joseph Casasanta, MD

Colorectal Surgery (Proctology) (CMS) · Danbury, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
69%Service-mix similarityView profile →

Marilee L Freitas, M.D.

Colorectal Surgery (Proctology) (CMS) · Stamford, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
68%Service-mix similarityView profile →

James M Mcclane, M.D.

Colorectal Surgery (Proctology) · General Surgery (CMS) · Norwalk, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
67%Service-mix similarityView profile →

Amanda Stevenson Ayers, M.D.

Colorectal Surgery (Proctology) (CMS) · Bloomfield, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
67%Service-mix similarityView profile →

Rafal Barczak, MD

Colorectal Surgery (Proctology) · General Surgery (CMS) · Meriden, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
67%Service-mix similarityView profile →

John M. Aversa, D.O

Colorectal Surgery (Proctology) (CMS) · Hamden, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
66%Service-mix similarityView profile →

Nicole Marie Saur, M.D.

Colorectal Surgery (Proctology) (CMS) · Fairfield, CT

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Diagnostic exam of anus using an endoscope (46600)
66%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.