Walter Brennan Igawa-Silva, M.D.
Internal Medicine Physician · Honolulu, HI
Walter Brennan Igawa-Silva, M.D. is an internal medicine physician with a practice address in Honolulu, Hawaii, and NPI 1437593688, issued on Apr 18, 2013. Check the license (Hawaii MD-18785, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Walter Brennan Igawa-Silva
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MD-18785 HI
A136674 CA
Self-reported in NPPES; status is on the state search - Practice location
- 459 Patterson RD, Honolulu, HI 96819
- Phone
- (808) 433-0360
- Enumerated
- Apr 18, 2013
- Record last updated
- Jul 27, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (808) 433-0327
- Medicare enrollment
- Enrolled (PECOS I20161004001037); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 902 in Hawaii → Look up another NPI →
Also registered at 459 Patterson RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Darrin Aase, PH.D.Clinical Psychologist1184960304
- Charles AbadRegistered Nurse1366298192
- Lorene AbalosRegistered Nurse1891540134
- Blessilda Concepcion Abarquez, RNRegistered Nurse1174376073
- Jay Ablog, RNRegistered Nurse1174377832
- Logan AceboPharmacist1053289090
Verify Walter Brennan Igawa-Silva in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD-18785Check 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 internal medicine physician in 2024
271 Medicare Part D claims for 108 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium20 claims
- Amoxicillin-Clavulanate Potass13 claims
- Prednisone13 claims
- Cefdinir12 claims
- Eliquis12 claims
- Metoprolol Tartrate11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Straub Clinic And HospitalHonolulu, HI · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Walter Brennan Igawa-Silva among 902 internal medicine physician records in Hawaii
Walter Brennan Igawa-Silva, 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 2013, is newer than 68% of them.
- NPI issued2013 · 68% of these records are older, 31% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated2013 · median 2001 among the 491 with a school on file
- Record last updated2019 · 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).
579 internal medicine physician records list a practice address in Honolulu
They are 579 of the 12,408 NPPES records with a practice address in Honolulu, and 902 internal medicine physician records in Hawaii.
All 902 in Hawaii → Every provider in Honolulu → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jochebed Carter, MDHonolulu, HI 968191205826492
- Shubhangini Devine, M.D.Honolulu, HI 968191568456796
- Jo-Ann Garrigan, MDHonolulu, HI 968191760432074
- Randolph Leon Guerrero, M.D.Honolulu, HI 968191184689671
- Jhoanna Mabutas, MDHonolulu, HI 968191841281599
- Maria Cecilia Mangrobang, M.D.Honolulu, HI 968191265481063
- Matthew Matko, M.D.Honolulu, HI 968191033171640
- Laura Nagata, M.D.Honolulu, HI 968191972552883
Common questions
What is Walter Brennan Igawa-Silva, M.D.'s NPI number?
Walter Brennan Igawa-Silva, M.D.'s National Provider Identifier (NPI) is 1437593688, issued on Apr 18, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Walter Brennan Igawa-Silva, M.D. located?
The NPPES record lists a practice address at 459 Patterson RD, Honolulu, HI, 96819. Phone: (808) 433-0360. Providers update this record themselves, so call before visiting.
How can I verify Walter Brennan Igawa-Silva, M.D.'s license?
NPPES lists Hawaii license number MD-18785, 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 Walter Brennan Igawa-Silva, M.D. prescribe under Medicare Part D?
In 2024, Walter Brennan Igawa-Silva, M.D. had 271 Medicare Part D claims for 108 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Walter Brennan Igawa-Silva, M.D.'s MIPS final score?
The 2023 MIPS final score is 86.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.