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Compare the published Medicare service mix of Zack A Nash, MD with clinicians in the same registry specialty: General Surgery · Vascular Surgery (CMS).

SAN ANTONIO, TX · Exact areaEdit location

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

Christine Johnson, MD

Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
69%Service-mix similarityView profile →

Celso Frederick Uribe, M.D.

Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
59%Service-mix similarityView profile →

Michael Peck, M.D.

Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
57%Service-mix similarityView profile →

Lucas Manuel Ferrer Cardona, M.D.

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
2 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
56%Service-mix similarityView profile →

Syed Zulfiqar Hyder Rizvi, M.D.

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
54%Service-mix similarityView profile →

Boulos Toursarkissian, MD

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
54%Service-mix similarityView profile →

Grady Dee Alsabrook, M.D.

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • 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 low level of medical decision making, if using time, 30 minutes or more (99203)
54%Service-mix similarityView profile →

Kevin Engledow, DO

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • 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 low level of medical decision making, if using time, 30 minutes or more (99203)
53%Service-mix similarityView profile →

William Overton Kirk, MD

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
53%Service-mix similarityView profile →

Gabriel J Bietz, M.D.

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
49%Service-mix similarityView profile →

Seth Harlon Fritcher, M.D.

General Surgery · Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
49%Service-mix similarityView profile →

Thomas John Gianis, M.D.

Vascular Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • 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 low level of medical decision making, if using time, 30 minutes or more (99203)
48%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.