William T. Eilert, MD
Emergency Medicine Physician · Wailuku, HI
William T. Eilert, MD is an emergency medicine physician with a practice address in Wailuku, Hawaii, and NPI 1003859653, issued on Jun 13, 2006. Check the license (Hawaii 4415, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- William T. Eilert
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 4415 HI
Self-reported in NPPES; status is on the state search - Practice location
- 221 Mahalani St, Wailuku, HI 96793
- Phone
- (808) 879-6071
- Enumerated
- Jun 13, 2006
- Record last updated
- Oct 9, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 02105301 HI
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 370 in Hawaii → Look up another NPI →
Also registered at 221 Mahalani St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Naira ArellanoAcute Care Nurse Practitioner1831525898
- Danielle Aubert-Anderson, LMSWSocial Worker1508369422
- James Bendon, MDDiagnostic Radiology Physician1780725432
- Miriam BerchukAnesthesiology Physician1013573823
- Ariel Berrios, PA-CPhysician Assistant1669911640
Verify William T. Eilert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license 4415Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average emergency medicine physician in 2024
21 Medicare Part D claims, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
William T. Eilert among 370 emergency medicine physician records in Hawaii
William T. Eilert, MD is one of 370 emergency medicine physician records with a practice address in Hawaii. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 64% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 55% of these records are
- Record last updated2008 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 emergency medicine physician records list a practice address in Wailuku
They are 19 of the 1,087 NPPES records with a practice address in Wailuku, and 370 emergency medicine physician records in Hawaii.
All 370 in Hawaii → Every provider in Wailuku → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Daniel Brandes, MDWailuku, HI 967931326075565
- Marc Emde, MDWailuku, HI 967931609819010
- Mark Haddad, MDWailuku, HI 967931861435430
- Jon Jancaterino, MDWailuku, HI 967931063402469
- William Langston, MDWailuku, HI 967931013903640
- Jenwei Luu, MDWailuku, HI 967931891738464
- Benjamin Massenburg, MDWailuku, HI 967931841238532
- John Mills, MDWailuku, HI 967931508809146
Common questions
What is William T. Eilert, MD's NPI number?
William T. Eilert, MD's National Provider Identifier (NPI) is 1003859653, issued on Jun 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William T. Eilert, MD located?
The NPPES record lists a practice address at 221 Mahalani St, Wailuku, HI, 96793. Phone: (808) 879-6071. Providers update this record themselves, so call before visiting.
How can I verify William T. Eilert, MD's license?
NPPES lists Hawaii license number 4415, as entered by the provider. Search the Hawaii Medical Board at https://cca.hawaii.gov/pvl/boards/medical/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William T. Eilert, MD prescribe under Medicare Part D?
In 2024, William T. Eilert, MD had 21 Medicare Part D claims; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.