Kaumakaokalani Shimatsu, M.D.
Internal Medicine Physician · Marysville, CA
Kaumakaokalani Shimatsu, M.D. is an internal medicine physician with a practice address in Marysville, California, and NPI 1194014357, issued on Mar 28, 2011. Check the license (California A123592, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kaumakaokalani Shimatsu
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A123592 CA
H00329654 HI
Self-reported in NPPES; status is on the state search - Practice location
- 5730 Packard Ave Ste 500, Marysville, CA 95901
- Phone
- (530) 749-3242
- Enumerated
- Mar 28, 2011
- Record last updated
- Dec 11, 2023
- Medicare enrollment
- Enrolled (PECOS I20161111001108); accepts Medicare assignment
- Medical or professional school
- University Of Hawaii John A. Burns School Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 5730 Packard Ave Ste 500
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kaumakaokalani Shimatsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123592Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,409 Medicare Part D claims for 246 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 70 claims were for opioids.
Most prescribed
- Atorvastatin Calcium83 claims
- Amlodipine Besylate69 claims
- Losartan Potassium46 claims
- Metformin Hcl46 claims
- Lisinopril45 claims
- Hydrocodone-Acetaminophen38 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: $21.10
1 payment: food and beverage; the largest payer was Gilead Sciences, 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.
Bills Medicare through 2 group practices
- Hawaii Permanente Medical Group IncWailuku, HI
- Peach Tree HealthcareSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kaumakaokalani Shimatsu among 17,696 internal medicine physician records in California
Kaumakaokalani Shimatsu, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2011 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 61% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 internal medicine physician records list a practice address in Marysville
They are 10 of the 708 NPPES records with a practice address in Marysville, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Marysville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hari Goyal, M.D.Marysville, CA 959011770571515
- Jerry Gross, D.O.Marysville, CA 959011386647709
- Shalini Gupta, M.D.Marysville, CA 959011891783692
- Dilip K CMarysville, CA 959011528684818
- Tam Nguyen, D.O.Marysville, CA 959011841200854
- Nathan Tang, M.D.Marysville, CA 959011215947247
- Baljinder Virdi, MDMarysville, CA 959011811383789
- Bisrat Woldemichael, MDMarysville, CA 959011568022663
Common questions
What is Kaumakaokalani Shimatsu, M.D.'s NPI number?
Kaumakaokalani Shimatsu, M.D.'s National Provider Identifier (NPI) is 1194014357, issued on Mar 28, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Kaumakaokalani Shimatsu, M.D. located?
The NPPES record lists a practice address at 5730 Packard Ave Ste 500, Marysville, CA, 95901. Phone: (530) 749-3242. Providers update this record themselves, so call before visiting.
How can I verify Kaumakaokalani Shimatsu, M.D.'s license?
NPPES lists California license number A123592, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kaumakaokalani Shimatsu, M.D. prescribe under Medicare Part D?
In 2024, Kaumakaokalani Shimatsu, M.D. had 1,409 Medicare Part D claims for 246 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.