Doctor profile · Federal record
Dr. Mark Casillas, M.D.
Surgery Physician (CMS: Colorectal Surgery (Proctology)) · Colon & Rectal Surgery Physician · Knoxville, TN
- NPI 1245458082
- Accepts Medicare
- MIPS 92.6 / 100 · 2023
- 20 yrs in practice
- Licensed in 2 states
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
1934 Alcoa Highway, Bldg D, Suite 370
Knoxville, TN 37920
(865) 305-5335
fax (865) 305-8840
Credentials & registration
- NPI registered
- April 2007 — 19 yrs on file
- Profile last updated
- February 4, 2014
- Year of graduation
- 2006 — 20 yrs since
- Specialty taxonomy
- 208600000X — NUCC code
- State licenses (2)
- Rhode Island #LP00968 · Tennessee #48676
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1245458082. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
255
Distinct HCPCS
10
Medicare allowed
$28,438
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
46600 |
Diagnostic exam of anus using an endoscope | 54 | 51 | $109 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 53 | 48 | $83 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 32 | 32 | $152 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 25 | 25 | $205 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 21 | 21 | $104 | |
45300 |
Diagnostic exam of rectum and lower large bowel using an endoscope | 18 | 17 | $118 | |
15860 |
Injection of agent into vein to assess blood flow of skin graft or flap | 15 | 15 | $49 | |
45384 |
Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery | 14 | 14 | $121 | |
45330 |
Diagnostic exam of lower portion of large bowel using a flexible endoscope | 12 | 11 | $28 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 11 | 11 | $100 |
In context: peer comparison
Among 17 peers in this city , average services per provider: 43. This provider delivers 5.9× the peer median.Open Payments
Industry payments received
All-time total
$554
Transactions
15
Manufacturers
9
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Medtronic, Inc. | 3 | $152.50 | |
| Kerecis Limited | 3 | $141.51 | |
| Stryker Corporation | 2 | $66.25 | |
| ABBVIE INC. | 2 | $55.57 | |
| Ethicon US, LLC | 1 | $33.50 | |
| Ferring Pharmaceuticals Inc. | 1 | $28.78 | |
| THD America, Inc. | 1 | $28.42 | |
| Integra LifeSciences Corporation | 1 | $26.12 | |
| La Jolla Pharmaceutical Company | 1 | $21.18 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
151
Patients
142
Total drug cost
$2,325
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Metronidazole | Generic | 59 | 55 | $112 |
| Ciprofloxacin Hcl | Generic | 52 | 48 | $105 |
| Ondansetron Hcl | Generic | 28 | 27 | $61 |
| Sutab (Sod Sulf/Pot Chloride/Mag Sulf) | Brand | 12 | 12 | $2,047 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Casillas's medical specialty?
Dr. Mark Casillas practices Surgery Physician in Knoxville, TN.
Where does Dr. Mark Casillas practice?
Dr. Mark Casillas practices at 1934 Alcoa Highway, Knoxville, TN 37920. Office phone: 8653055335.
What is Dr. Mark Casillas's NPI?
Dr. Mark Casillas's National Provider Identifier (NPI) is 1245458082, issued by NPPES.
Does Dr. Mark Casillas accept Medicare assignment?
Yes. Dr. Mark Casillas accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Casillas commonly perform?
Top Medicare-reported procedures in 2023: Diagnostic exam of anus using an endoscope (HCPCS 46600); Established patient office or other outpatient visit (HCPCS 99213); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.