Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark A Isaeff, MD

Individual provider Internal Medicine Physician · NPI 1104815075

Mark A Isaeff, MD is an Internal Medicine in San Antonio, Texas. Graduated from Georgetown University School of Medicine in 1998, 28 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
28
Trained at
Georgetown University School of Medicine
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

1303 McCullough Ave Ste 542
San Antonio, TX 78212-5607
Phone: (210) 572-4431
Fax: (210) 572-4435
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence K8638 (TX)

Record details

NPI number1104815075
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 13, 2005
Last updated in NPPESApril 21, 2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1998 (28 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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