Mary Ann Santos Pefanco, M.D.
Internal Medicine Physician · Hilo, HI
Mary Ann Santos Pefanco, M.D. is an internal medicine physician with a practice address in Hilo, Hawaii, and NPI 1780769703, issued on Oct 26, 2006. Check the license (Hawaii MD13875, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mary Ann Santos Pefanco
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD13875 HI
Self-reported in NPPES; status is on the state search - Practice location
- 1178B Kinoole St, Hilo, HI 96720
- Phone
- (808) 969-1427
- Enumerated
- Oct 26, 2006
- Record last updated
- Mar 20, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (808) 961-4909
- Medicare enrollment
- Enrolled (PECOS I20130508000593); 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 1178B Kinoole St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charlotte Grimm, APRNFamily Nurse Practitioner1316905045
- Maylayne Luis, RNRegistered Nurse1003139551
- Rochelle Mathieu, APRNFamily Nurse Practitioner1942258892
Verify Mary Ann Santos Pefanco in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD13875Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average internal medicine physician in 2024
9,292 Medicare Part D claims for 548 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 193 claims were for opioids.
Most prescribed
- Levothyroxine Sodium573 claims
- Atorvastatin Calcium460 claims
- Amlodipine Besylate391 claims
- Losartan Potassium334 claims
- Gabapentin311 claims
- Donepezil Hcl233 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 MIPS final score for 2023 (Medicare payment program): 83.9 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- King County Public Hospital District NO 2Kirkland, WA
- Select Outpatient Services IncGlenview, IL
- Select Rehabilitation, LLCGlenview, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Ann Santos Pefanco among 902 internal medicine physician records in Hawaii
Mary Ann Santos Pefanco, 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
- Graduated1999 · median 2001 among the 491 with a school on file
- Record last updated2008 · 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).
34 internal medicine physician records list a practice address in Hilo
They are 34 of the 1,758 NPPES records with a practice address in Hilo, and 902 internal medicine physician records in Hawaii.
All 902 in Hawaii → Every provider in Hilo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Carlos Abeyta, MDHilo, HI 967201942253109
- Wendy Barnes, MDHilo, HI 967201164534806
- Daniel Belcher, M.D.Hilo, HI 967201144270927
- Francis Cavanaugh, MDHilo, HI 967201033165998
- Alan Desilva, MD INC.Hilo, HI 967201790885994
- Mary Iyer, M.D.Hilo, HI 967201366470502
- David Jung, M.D.Hilo, HI 967201649281643
- Craig Kadooka, M.D.Hilo, HI 967201467419630
Common questions
What is Mary Ann Santos Pefanco, M.D.'s NPI number?
Mary Ann Santos Pefanco, M.D.'s National Provider Identifier (NPI) is 1780769703, issued on Oct 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ann Santos Pefanco, M.D. located?
The NPPES record lists a practice address at 1178B Kinoole St, Hilo, HI, 96720. Phone: (808) 969-1427. Providers update this record themselves, so call before visiting.
How can I verify Mary Ann Santos Pefanco, M.D.'s license?
NPPES lists Hawaii license number MD13875, 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 Mary Ann Santos Pefanco, M.D. prescribe under Medicare Part D?
In 2024, Mary Ann Santos Pefanco, M.D. had 9,292 Medicare Part D claims for 548 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mary Ann Santos Pefanco, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.9 of 100. 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.