Irim A. Massay, MD
Internal Medicine Physician · Saint Charles, MO
Irim A. Massay, MD is an internal medicine physician with a practice address in Saint Charles, Missouri, and NPI 1619931110, issued on Apr 13, 2006. Check the license (Missouri 2008017169, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Irim A. Massay
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2008017169 MO
Self-reported in NPPES; status is on the state search - Practice location
- 300 1St Capitol Dr, Saint Charles, MO 63301
- Phone
- (314) 317-0600
- Enumerated
- Apr 13, 2006
- Record last updated
- Jun 16, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (314) 317-0606
- Medicaid IDs
- 1619931110 MO
1619931110 IL - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 300 1St Capitol Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Abbott, M.D.Emergency Medicine Physician1144269267
- Mohamad Albsheri, MDInternal Medicine Physician1447508874
- Nicole Allen, CRNACertified Registered Nurse Anesthetist1487993663
- Joseph Attewell, M.D.Critical Care Medicine (Internal Medicine) Physician1962456657
- Ellen Atwood, PA-CPhysician Assistant1487104303
- Christina Azzam, CRNACertified Registered Nurse Anesthetist1487074357
Verify Irim A. Massay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2008017169Check 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
26 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Lamotrigine26 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.
Irim A. Massay among 2,604 internal medicine physician records in Missouri
Irim A. Massay, MD is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 55% of these records are
- Record last updated2018 · 48% 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 Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
36 internal medicine physician records list a practice address in Saint Charles
They are 36 of the 1,547 NPPES records with a practice address in Saint Charles, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Saint Charles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mohamad Albsheri, MDSaint Charles, MO 633011447508874
- Mahendra Bhuyan, M.B.B.S, MD.St Charles, MO 633011811240773
- Shilpa Bodhanampati, M.D.Saint Charles, MO 633011982860888
- Ping Chang, MDSaint Charles, MO 633011124091194
- Christopher Hill, D.O.Saint Charles, MO 633011366434896
- Syed Hussain, M.DSaint Charles, MO 633011588818777
- Romel Izquierdo-Malon, M.D.Saint Charles, MO 633011033422357
- Khaled Jumean, M.D.Saint Charles, MO 633011134351448
Common questions
What is Irim A. Massay, MD's NPI number?
Irim A. Massay, MD's National Provider Identifier (NPI) is 1619931110, issued on Apr 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Irim A. Massay, MD located?
The NPPES record lists a practice address at 300 1St Capitol Dr, Saint Charles, MO, 63301. Phone: (314) 317-0600. Providers update this record themselves, so call before visiting.
How can I verify Irim A. Massay, MD's license?
NPPES lists Missouri license number 2008017169, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Irim A. Massay, MD prescribe under Medicare Part D?
In 2024, Irim A. Massay, MD had 26 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.