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

Mark A. Isaeff, MD PA

Organization Internal Medicine Physician · NPI 1891090221

Mark A. Isaeff, MD PA is an Internal Medicine Physician in San Antonio, Texas. Registered with an NPI since 2011.

In the registry since
2011
What do these letters mean?
PA — Professional association
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1303 McCullough Ave 542
San Antonio, TX 78212-5609
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

Record details

NPI number1891090221
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Isaeff — President · (210) 572-4431
NPI enumeratedJanuary 16, 2011
Last updated in NPPESApril 14, 2011
Mailing address1303 McCullough Ave, 542, San Antonio, TX 78212-5609

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