Dr. Mark A. Casillas Jr., MD

Dr. Casillas practices at The University of Tennessee Medical Center in Knoxville, Tennessee, part of Ut Medical.

Dr. Casillas' NPI, 1245458082, was assigned on April 24, 2007. Dr. Casillas graduated from Heersink School of Medicine - Birmingham in 2006. Dr. Casillas' Rhode Island license number on file is LP00968.

Dr. Casillas' primary practice is The University of Tennessee Medical Center, at 1924 Alcoa Highway, Knoxville, TN 37920 in Knox County. The practice phone is (865) 305-9000.

Dr. Casillas' primary practice is The University of Tennessee Medical Center in Knoxville, Tennessee, part of Ut Medical. Dr. Casillas is also affiliated with Holston Valley Medical Center. The medical group on file is UT Internal Medicine - Pellissippi. Dmand AI also links Dr. Casillas to 1 more group practice or clinic, named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Casillas practices, 3 sites in all. Vendor and product names are available with a free account.

Surgery is Dr. Casillas' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Casillas is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery. Dmand AI has Dr. Casillas' licenses on file in 4 states: Rhode Island, Tennessee, Indiana and Michigan.

Dmand AI lists colonoscopy, colon removal and hemorrhoids among the conditions Dr. Casillas treats.

CMS data shows 271 Medicare services from Dr. Casillas across 10 procedure codes in 2024, for 166 Medicare patients. Medicare paid $24,702 for them.

CMS counts 166 Medicare patients who saw Dr. Casillas in 2024. The largest group is 65 to 74, with 79 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 8% are also on Medicaid. Their average risk score is 1.51, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Casillas' median patient age at 66, with 58% women.

In 2024, Dr. Casillas wrote 308 Medicare Part D claims for 146 patients. 85% of them were for generic drugs. CMS names the drug for 198 of them, across 5 drugs with 11 or more claims each, at $6,569 in total drug cost. In 2023, CMS named 151 claims across 4 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 96 out of 100 for Dr. Casillas for performance year 2024, reported through an alternative payment model (APM). Dr. Casillas accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 70 procedures of colonoscopy by Dr. Casillas, more than 71% of the clinicians it reports for that procedure.

Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)

Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)

Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)

Dmand AI links 16 papers to Dr. Casillas, published from 2013 to 2024. 2018 was the busiest year, with 2. The most frequent topics are Postoperative Complications, Colectomy and Laparoscopy. Dr. Casillas has published most often in Am Surg. Dr. Casillas' most frequent co-authors are Andrew J. Russ, MD, James Martin McLoughlin, MD and Sneha G. Bhat, MD.

CMS Open Payments shows 212 general payments to Dr. Casillas from 52 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 92% of the total. Intuitive Surgical, Inc. paid the most, $1,483.

Dmand AI lists 1 award for Dr. Casillas.

Dr. Casillas graduated from Heersink School of Medicine - Birmingham in 2006. Dr. Casillas is a member of ACS, ASCRS and SAGES.

Dr. Casillas is in network with 17 carriers, including Aetna, Cigna and United Healthcare. PPO plans come from the most carriers, 12. Check the plan with the practice before a visit.