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

Individual provider Internal Medicine Physician · NPI 1790949956

Derek R Illastron, MD is a Hospitalist in Kahului, Hawaii. Qualified in 2005, 21 years ago. Practices with Hawaii Permanente Medical Group Inc, a 705-clinician group and accepts Medicare assignment. Licensed in Hawaii and Massachusetts.

Years since qualifying
21
Licensed in
HI, MA
In the registry since
2008
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

110 E Kaahumanu Ave
Kahului, HI 96732-2118
Phone: (808) 242-6464
Fax: (808) 243-2367
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD-18353 (HI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 235414 (MA)

Record details

NPI number1790949956
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 16, 2008
Last updated in NPPESMarch 19, 2019
Mailing address2180 Main St, Wailuku, HI 96793-1625

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Hawaii Permanente Medical Group Inc — 705 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Other providers in Kahului