Samuel Ernest William Johnsen, M.D.
Internal Medicine Physician · Lahaina, HI
Samuel Ernest William Johnsen, M.D. is an internal medicine physician with a practice address in Lahaina, Hawaii, and NPI 1669491858, issued on Jul 19, 2006. Check the license (Hawaii MD12422, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Samuel Ernest William Johnsen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD12422 HI
Self-reported in NPPES; status is on the state search - Practice location
- 180 Dickenson St Ste 103, Lahaina, HI 96761
- Phone
- (808) 214-5985
- Enumerated
- Jul 19, 2006
- Record last updated
- Oct 2, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (808) 214-6766
- Medicaid ID
- 824532282 HI
- Medicare enrollment
- Enrolled (PECOS I20100317000222); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 902 in Hawaii → Look up another NPI →
Also registered at 180 Dickenson St Ste 103
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elizabeth Schusser, M.D.Family Medicine Physician1457494445
Verify Samuel Ernest William Johnsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD12422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average internal medicine physician in 2024
5,021 Medicare Part D claims for 300 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 474 claims were for opioids.
Most prescribed
- Atorvastatin Calcium313 claims
- Rosuvastatin Calcium170 claims
- Hydrocodone-Acetaminophen139 claims
- Levothyroxine Sodium139 claims
- Amlodipine Besylate137 claims
- Lisinopril134 claims
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.
Industry payments in 2024: $858.39
41 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Samuel Ernest William Johnsen among 902 internal medicine physician records in Hawaii
Samuel Ernest William Johnsen, M.D. is one of 902 internal medicine physician records with a practice address in Hawaii. 71% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 55% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated1992 · median 2001 among the 491 with a school on file
- Record last updated2018 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Lahaina
They are 3 of the 195 NPPES records with a practice address in Lahaina, and 902 internal medicine physician records in Hawaii.
All 902 in Hawaii → Every provider in Lahaina → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Norman Estin, M.D.Lahaina, HI 967611760542914
- Fredrick Sands, MDLahaina, HI 967611225181803
- Christine Baptiste Freeman, M.D.Lihue, HI 967661194213710
- Michael Braun, M.D.Lihue, HI 967661316996358
- Anne Dempsey, M.D.Lihue, HI 967661376571125
- Arnulfo Diaz, M.D.Lihue, HI 967661245335678
- Constante Flora, M.D.Lihue, HI 967661376548297
- Luke Fornari, M.D.Lihue, HI 967661114001617
Common questions
What is Samuel Ernest William Johnsen, M.D.'s NPI number?
Samuel Ernest William Johnsen, M.D.'s National Provider Identifier (NPI) is 1669491858, issued on Jul 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Samuel Ernest William Johnsen, M.D. located?
The NPPES record lists a practice address at 180 Dickenson St Ste 103, Lahaina, HI, 96761. Phone: (808) 214-5985. Providers update this record themselves, so call before visiting.
How can I verify Samuel Ernest William Johnsen, M.D.'s license?
NPPES lists Hawaii license number MD12422, 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 Samuel Ernest William Johnsen, M.D. prescribe under Medicare Part D?
In 2024, Samuel Ernest William Johnsen, M.D. had 5,021 Medicare Part D claims for 300 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.