Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Robert A. Marciniak, MD

Individual provider Medical Oncology Physician · NPI 1700889201

Dr. Robert A. Marciniak, MD is a Medical Oncology Physician in San Antonio, Texas. Licensed in Texas. Registered with an NPI since 2005.

Licensed in
TX
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

7979 Wurzbach Rd
San Antonio, TX 78229-4427 Not confirmed with CMS for 16 years — call before visiting
Phone: (210) 450-1000
Fax: (210) 450-1150
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence L3005 (TX)

Record details

NPI number1700889201
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 27, 2005
Last updated in NPPESAugust 18, 2010

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients37
Services billed 47 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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