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Compare the published Medicare service mix of Mark Herbert Barney, MD with clinicians in the same registry specialty: Nephrology (CMS).

LAS VEGAS, NV · Exact areaEdit location

2024 published service data · 71 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Luana Pillon, M.D.

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
2 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
63%Service-mix similarityView profile →

Vincent L Yang, M.D.

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
56%Service-mix similarityView profile →

Kevin Alexander Yu, D.O.

Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
56%Service-mix similarityView profile →

Shadi Nijim, M.D.

Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
55%Service-mix similarityView profile →

Jay Koe Chu, M.D.

Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
54%Service-mix similarityView profile →

Adin Boldur, MD

Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
54%Service-mix similarityView profile →

Chidi Okafor, MD

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
52%Service-mix similarityView profile →

Mark Vishnepolsky, M.D.

Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
52%Service-mix similarityView profile →

Jeffrey Y Ryu, M.D.

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
2 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
52%Service-mix similarityView profile →

Samuel Adam Kantor, M.D.

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
2 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
50%Service-mix similarityView profile →

Seyedqumars Mirfendereski, MD

Internal Medicine · Nephrology (CMS) · Las Vegas, NV

Shared published services
3 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
50%Service-mix similarityView profile →

Sayed Z Qazi, M.D.

Nephrology (CMS) · Las Vegas, NV

Shared published services
2 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
49%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.