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Compare the published Medicare service mix of Dmitry B Opolinsky, DO with clinicians in the same registry specialty: Internal Medicine · Nephrology (CMS).

BRUNSWICK, ME · 25 milesEdit location
Within 25 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 24 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Carl J. Blond, M.D.

Internal Medicine · Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hospital discharge day management, more than 30 minutes (99239)
84%Service-mix similarity~22.6 milesView profile →

Jonathan Amatruda, M.D.

Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
60%Service-mix similarity~22.6 milesView profile →

John Patrick Vella, M.D.

Internal Medicine · Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
56%Service-mix similarity~22.6 milesView profile →

Hassan Mahmoud, M.D.

Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
50%Service-mix similarity~22.6 milesView profile →

Gary Diperna, DO

Internal Medicine · Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Hemodialysis procedure with physician evaluation (90935)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
43%Service-mix similarity~22.6 milesView profile →

Zain Mousa Aref Alshanableh, MD

Nephrology (CMS) · Portland, ME

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
43%Service-mix similarity~22.6 milesView profile →

Ioan Cosma, MD

Internal Medicine · Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
43%Service-mix similarity~22.6 milesView profile →

Grant Oakley, D.O.

Nephrology (CMS) · Portland, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
42%Service-mix similarity~22.6 milesView profile →

Matthew G Pyenta, D.O.

Nephrology (CMS) · Lewiston, ME

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
41%Service-mix similarity~17.5 milesView profile →

Abd Assalam Qannus, M.D.

Nephrology (CMS) · Portland, ME

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
40%Service-mix similarity~22.6 milesView profile →

Robert Morse Hayden, MD

Nephrology (CMS) · Portland, ME

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
39%Service-mix similarity~22.6 milesView profile →

Stepfany Fuentes, DO

Internal Medicine · Nephrology (CMS) · Portland, ME

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Hemodialysis procedure with physician evaluation (90935)
34%Service-mix similarity~22.6 milesView 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 approximate distance 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.