Ireneo Yap Diaz, M.D.
Internal Medicine Physician · Battle Creek, MI
Ireneo Yap Diaz, M.D. is an internal medicine physician with a practice address in Battle Creek, Michigan, and NPI 1043321409, issued on Aug 31, 2006. Check the license (Michigan 4301065745, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Ireneo Yap Diaz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301065745 MI
Self-reported in NPPES; status is on the state search - Practice location
- 5500 Armstrong RD, Battle Creek, MI 49015
- Phone
- (269) 966-5600
- Enumerated
- Aug 31, 2006
- Record last updated
- Sep 3, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (269) 660-6041
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 5500 Armstrong RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christine Anguras, D.O.Internal Medicine Physician1558473843
- William Arneson, MS, RPHPharmacist1316047806
- Sandra Badt, LMSWClinical Social Worker1831122787
- Barbara Baggerly, RN, MSN, GNPGerontology Nurse Practitioner1316966377
- Govardhana Bandlamudi, MDGeriatric Psychiatry Physician1316952773
- Marian Beardsley-Gibbs, LMSWClinical Social Worker1255368569
Verify Ireneo Yap Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301065745Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
29 Medicare Part D claims, against an average of 3,176 among the 108,855 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.
Ireneo Yap Diaz among 5,735 internal medicine physician records in Michigan
Ireneo Yap Diaz, M.D. is one of 5,735 internal medicine physician records with a practice address in Michigan. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2020 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
45 internal medicine physician records list a practice address in Battle Creek
They are 45 of the 2,117 NPPES records with a practice address in Battle Creek, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Battle Creek → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Christine Anguras, D.O.Battle Creek, MI 490151558473843
- David Cavanagh, M.D.Battle Creek, MI 490151629186085
- Ravi Chadalavada, MDBattle Creek, MI 490151639280662
- Montie Gould, M.D.Battle Creek, MI 490151184666331
- Mehmet Ismailoglu, M.D.Battle Creek, MI 490151477516557
- Neena Mandavia, M.D.Battle Creek, MI 490151598861288
- Mohammed Mohiuddin, M.D.Battle Creek, MI 490151538266622
- Ritha NajiBattle Creek, MI 490151902912363
Common questions
What is Ireneo Yap Diaz, M.D.'s NPI number?
Ireneo Yap Diaz, M.D.'s National Provider Identifier (NPI) is 1043321409, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ireneo Yap Diaz, M.D. located?
The NPPES record lists a practice address at 5500 Armstrong RD, Battle Creek, MI, 49015. Phone: (269) 966-5600. Providers update this record themselves, so call before visiting.
How can I verify Ireneo Yap Diaz, M.D.'s license?
NPPES lists Michigan license number 4301065745, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ireneo Yap Diaz, M.D. prescribe under Medicare Part D?
In 2024, Ireneo Yap Diaz, M.D. had 29 Medicare Part D claims; 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.