Nancy Siyang Manglallan-Yang, MD
Obstetrics & Gynecology Physician · Kahului, HI
Nancy Siyang Manglallan-Yang, MD is an obstetrics & gynecology physician with a practice address in Kahului, Hawaii, and NPI 1083238406, issued on Jun 1, 2020. Check the license (Hawaii MD-25818, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Nancy Siyang Manglallan-Yang
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- MD-25818 HI
61521287 WA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Hookele St Ste 910, Kahului, HI 96732
- Phone
- (808) 686-4690
- Enumerated
- Jun 1, 2020
- Record last updated
- Oct 2, 2025
- Fax
- (808) 686-2127
- Medicare enrollment
- Enrolled (PECOS I20251029001514); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 288 in Hawaii → Look up another NPI →
Also registered at 100 Hookele St Ste 910
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Holly Bullock, MD, MPHObstetrics & Gynecology Physician1063777274
Verify Nancy Siyang Manglallan-Yang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD-25818Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
23 Medicare Part D claims for 11 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
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: $102.00
1 payment: food and beverage; the largest payer was Hologic Sales and Service, LLC. The 21,429 providers of this specialty with any payment received $1,030.61 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 one group practice
- Queens University Medical GroupHonolulu, HI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy Siyang Manglallan-Yang among 288 obstetrics & gynecology physician records in Hawaii
Nancy Siyang Manglallan-Yang, MD is one of 288 obstetrics & gynecology physician records with a practice address in Hawaii. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 84% of them.
- NPI issued2020 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2020 · median 2006 among the 158 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 obstetrics & gynecology physician records list a practice address in Kahului
They are 8 of the 661 NPPES records with a practice address in Kahului, and 288 obstetrics & gynecology physician records in Hawaii.
All 288 in Hawaii → Every provider in Kahului → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Stacy Ammerman, DOKahului, HI 967321437341559
- Holly Bullock, MD, MPHKahului, HI 967321063777274
- Trina Chakravarty, MDKahului, HI 967321558744177
- James Frede, MDKahului, HI 967321497757223
- Colleen Inouye Baum, M.D.Kahului, HI 967321760455562
- Jennifer Leeper, D.O.Kahului, HI 967321124065354
- Inna Santkovsky, M.D.Kahului, HI 967321821436676
- James Lyons, MDKahuku, HI 967311154356368
Common questions
What is Nancy Siyang Manglallan-Yang, MD's NPI number?
Nancy Siyang Manglallan-Yang, MD's National Provider Identifier (NPI) is 1083238406, issued on Jun 1, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Nancy Siyang Manglallan-Yang, MD located?
The NPPES record lists a practice address at 100 Hookele St Ste 910, Kahului, HI, 96732. Phone: (808) 686-4690. Providers update this record themselves, so call before visiting.
How can I verify Nancy Siyang Manglallan-Yang, MD's license?
NPPES lists Hawaii license number MD-25818, 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 Nancy Siyang Manglallan-Yang, MD prescribe under Medicare Part D?
In 2024, Nancy Siyang Manglallan-Yang, MD had 23 Medicare Part D claims for 11 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.