Dr. Mari K. Otsuka I, MD
- Medicare services, 2018
- 293
- Part D claims, 2019
- 17
- Industry payments
- $4,847
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 321 N Kuakini St Ste 811 Suite 811, Honolulu, HI 96817-2362
- Practice phone
- Call (808) 531-2731
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Russell Wong
Multi-specialty group site · Honolulu, Hawaii
Find Dr. Otsuka's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mari K. Otsuka I is an internist in Honolulu, Hawaii
Dr. Otsuka practices at Russell Wong in Honolulu, Hawaii.
Dr. Otsuka's NPI, 1538165188, was assigned on June 27, 2005. Dr. Otsuka graduated from University of California, San Francisco School of Medicine in 1979. Dr. Otsuka holds Hawaii license MD4561.
- NPI
- 1538165188NPI Registry (opens in a new tab)
- NPI enumeration date
- June 27, 2005
- NPI status
- Active
- Practice phone
- (808) 531-2731
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mari K. Otsuka I practices at Russell Wong in Honolulu, Hawaii
Dr. Otsuka's primary practice is Russell Wong, at 321 N Kuakini St Ste 811 Suite 811, Honolulu, HI 96817-2362. The practice phone is (808) 531-2731.
- Russell Wong321 N Kuakini St Ste 811 Suite 811, Honolulu, HI 96817-2362Phone(808) 531-2731
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mari K. Otsuka I is affiliated with 1 site of care and 1 medical group
Dr. Otsuka's primary practice is Russell Wong in Honolulu, Hawaii. Dmand AI also links Dr. Otsuka to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Mari K. Otsuka I's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Otsuka practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Russell Wong | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mari K. Otsuka I is one of 771 internists in Hawaii
Internal medicine is Dr. Otsuka's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Otsuka is licensed in Hawaii.
Specialties and state licenses
- Internal medicine, HawaiiPrimary
Internists near Dr. Otsuka
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mari K. Otsuka I billed Medicare for 293 services in 2018
CMS data shows 293 Medicare services from Dr. Otsuka across 3 procedure codes in 2018. Medicare paid $11,239 for them. Every service was in an office.
Dr. Otsuka's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 2852018: 22322%
- Tests and treatments
- 2017: 362018: 7094%
- Other services
- 2017: 112018: 0100%
Dr. Otsuka compared with the Hawaii median for internists, 2018
- Dr. Otsuka
- Hawaii median
- Medicare services
- 293vs 34214% below
- Part D claims
- 17vs 67097% below
Medians across 699 internists in Hawaii with Dmand AI profiles that report each measure.
Dr. Otsuka's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Otsuka?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Otsuka and other internists in Hawaii.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mari K. Otsuka I's patients have a median age of 70
Across all payers, Dmand AI patient panel data puts Dr. Otsuka's median patient age at 70, with 86% women.
Dr. Otsuka's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women86%
- Men14%
Source: Dmand AI Patient Panel Data
Dr. Mari K. Otsuka I wrote 17 Medicare Part D claims in 2019
In 2019, Dr. Otsuka wrote 17 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $237 in total drug cost. In 2018, CMS named 1,082 claims across 27 drugs.
Dr. Otsuka's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 1,0822019: 1798%
Drugs named by CMS: 1 in 2019, 27 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Mari K. Otsuka I received $4,847 in industry payments from 2016 to 2021
CMS Open Payments shows 154 general payments to Dr. Otsuka from 22 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 99% of the total. Novo Nordisk Inc paid the most, $757.
General payments to Dr. Otsuka by program year, 2016 to 2021
General payments to Dr. Otsuka by kind, 2016 to 2021
- Food and beverage$4,81299%
- Education$341%
Companies that paid Dr. Otsuka the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mari K. Otsuka I graduated from University of California, San Francisco School of Medicine
Dr. Otsuka graduated from University of California, San Francisco School of Medicine in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mari K. Otsuka I's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mari K. Otsuka I
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mari K. Otsuka I's NPI number?
Dr. Mari K. Otsuka I's NPI number is 1538165188. It was assigned on June 27, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mari K. Otsuka I?
Dr. Mari K. Otsuka I is an internist in Honolulu, Hawaii. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mari K. Otsuka I practice?
Dr. Otsuka practices at 321 N Kuakini St Ste 811 Suite 811, Honolulu, HI 96817-2362. Dr. Otsuka's primary practice is Russell Wong in Honolulu, Hawaii. Dmand AI also links Dr. Otsuka to 1 medical group.
What is Dr. Mari K. Otsuka I's office phone number?
The practice phone on file for Dr. Otsuka is (808) 531-2731.
What is Dr. Mari K. Otsuka I's medical license number?
Dr. Otsuka holds Hawaii license MD4561.
Does Dr. Mari K. Otsuka I accept Medicare?
Yes. CMS data shows Dr. Otsuka billed Medicare for 293 services in 2018.
What services does Dr. Mari K. Otsuka I bill to Medicare?
In 2018, Dr. Otsuka's most billed Medicare services were office visit, established patient (99213), health assessment (96127) and office visit, established patient (99214).
Where did Dr. Mari K. Otsuka I go to medical school?
Dr. Otsuka graduated from University of California, San Francisco School of Medicine in 1979.
What drugs does Dr. Mari K. Otsuka I prescribe most?
In 2019 Medicare Part D data, Dr. Otsuka's most prescribed drugs by claims were Atorvastatin Calcium.
Has Dr. Mari K. Otsuka I received payments from drug or device companies?
CMS Open Payments shows $4,847 in general payments to Dr. Otsuka from 22 companies from 2016 to 2021. The largest total came from Novo Nordisk Inc.
How long has Dr. Mari K. Otsuka I been practicing?
Dr. Otsuka graduated from medical school in 1979, 47 years ago.
Selling to internal medicine practices?
See internists in Hawaii by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card