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

Mark Harrison MD PLLC

Organization Radiation Oncology Physician · NPI 1104234640

Mark Harrison MD PLLC provides Radiation Oncology Physician services in Harlingen, Texas. Licensed in Texas. Registered with an NPI since 2014.

Licensed in
TX
In the registry since
2014
What do these letters mean?
PLLC — Professional limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1719 Treasure Hills Blvd
Harlingen, TX 78550-8912 Not confirmed with CMS for 12 years — call before visiting
Phone: (956) 430-9400
Fax: (956) 440-1189
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X (TX)

Record details

NPI number1104234640
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Harrison — President · (956) 430-6400
NPI enumeratedJuly 29, 2014
Last updated in NPPESJuly 29, 2014
Mailing address1719 Treasure Hills Blvd, Harlingen, TX 78550-8912

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