Doctor profile · Federal record
Dr. Derek Illastron, MD
Internal Medicine Physician (CMS: Hospitalist) · Internal Medicine Physician · Kahului, HI
- NPI 1790949956
- Accepts Medicare
- MIPS 87.0 / 100 · 2023
- 21 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
110 E Kaahumanu Ave
Kahului, HI 967322118
(808) 242-6464
fax (808) 243-2367 - Mailing address
-
2180 Main St
Wailuku, HI 967931625
Credentials & registration
- NPI registered
- July 2008 — 18 yrs on file
- Profile last updated
- March 19, 2019
- Year of graduation
- 2005 — 21 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State licenses (2)
- Hawaii #MD-18353 · Massachusetts #235414
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1790949956. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
443
Distinct HCPCS
3
Medicare allowed
$52,841
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 373 | 92 | $118 | |
99239 |
Hospital discharge day management, more than 30 minutes | 55 | 54 | $113 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 15 | 15 | $175 |
In context: peer comparison
Among 3 peers in this city , average services per provider: 117. This provider delivers 3.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
222
Patients
42
Total drug cost
$21,617
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Azathioprine | Generic | 23 | 0 | $927 |
| Atorvastatin Calcium | Generic | 20 | 15 | $402 |
| Eliquis (Apixaban) | Brand | 19 | 0 | $10,575 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 16 | 16 | $209 |
| Gabapentin | Generic | 15 | 0 | $109 |
| Lisinopril | Generic | 15 | 0 | $92 |
| Advair Diskus (Fluticasone Propion/Salmeterol) | Brand | 14 | 0 | $5,731 |
| Famotidine | Generic | 14 | 0 | $188 |
| Levothyroxine Sodium | Generic | 14 | 0 | $168 |
| Methotrexate (Methotrexate Sodium) | Brand | 14 | 0 | $265 |
Frequently asked questions
What is Dr. Derek Illastron's medical specialty?
Dr. Derek Illastron practices Internal Medicine Physician in Kahului, HI.
Where does Dr. Derek Illastron practice?
Dr. Derek Illastron practices at 110 E Kaahumanu Ave, Kahului, HI 967322118. Office phone: 8082426464.
What is Dr. Derek Illastron's NPI?
Dr. Derek Illastron's National Provider Identifier (NPI) is 1790949956, issued by NPPES.
Does Dr. Derek Illastron accept Medicare assignment?
Yes. Dr. Derek Illastron accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Derek Illastron commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Hospital discharge day management (HCPCS 99239); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.