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

Mark A. Casillas Jr., MD

Individual provider Surgery Physician · NPI 1245458082

Mark A. Casillas Jr., MD is a Colorectal Surgery (Proctology) in Knoxville, Tennessee. Qualified in 2006, 20 years ago. Practices with University Health System, Inc, a 529-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Rhode Island and Tennessee.

Years since qualifying
20
Licensed in
RI, TN
In the registry since
2007
Specialties on file
2
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

1934 Alcoa Hwy Bldg D Ste 370
Knoxville, TN 37920
Phone: (865) 305-5335
Fax: (865) 305-8840
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence LP00968 (RI)
Colon & Rectal Surgery Physician Taxonomy 208C00000X · Licence 48676 (TN)

Record details

NPI number1245458082
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 24, 2007
Last updated in NPPESFebruary 4, 2014

Medicare enrollment

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

Medicare specialtyCOLORECTAL SURGERY (PROCTOLOGY)
Also practisesGENERAL SURGERY
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice University Health System, Inc. — 529 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

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