Irena Maier, M.D.
Gastroenterology Physician · Boston, MA
Irena Maier, M.D. is a gastroenterology physician with a practice address in Boston, Massachusetts, and NPI 1235161779, issued on Jul 7, 2006. Check the license (Massachusetts 219818, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Irena Maier
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 219818 MA
Self-reported in NPPES; status is on the state search - Practice location
- 133 Brookline Ave, Boston, MA 02215
- Phone
- (617) 421-1091
- Enumerated
- Jul 7, 2006
- Record last updated
- Jan 7, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (617) 421-2555
- Medicaid ID
- 2091178 MA
- Medicare enrollment
- Enrolled (PECOS I20041001000952); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 133 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Andrew Allmendinger, DODiagnostic Radiology Physician1972820942
- Dana An, LCSWClinical Social Worker1215108238
Verify Irena Maier in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 219818Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% more Medicare Part D claims than the average gastroenterology physician in 2024
1,423 Medicare Part D claims for 633 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Omeprazole172 claims
- Gavilyte-C168 claims
- Peg3350-Sod Sul-Nacl-Kcl-Asb-C160 claims
- Famotidine140 claims
- Pantoprazole Sodium113 claims
- Sod Sulf-Potass Sulf-Mag Sulf70 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.
Bills Medicare through one group practice
- Atrius Health IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Irena Maier among 686 gastroenterology physician records in Massachusetts
Irena Maier, M.D. is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 49% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1994 · median 2004 among the 491 with a school on file
- Record last updated2021 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Boston → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Michael Apstein, MDBoston, MA 022151609854603
- Alphonso Brown, MDBoston, MA 022151871579987
- Valerie Byrnes, M.D.Boston, MA 022151467410332
- Catherine Cheney, M.D.Boston, MA 022151710962030
- Zalman Falchuk, MDBoston, MA 022151912996000
- Kenneth Falchuk, M.D.Boston, MA 022151639154305
- Douglas Horst, MDBoston, MA 022151518957224
- John Lamont, MDBoston, MA 022151316903735
Common questions
What is Irena Maier, M.D.'s NPI number?
Irena Maier, M.D.'s National Provider Identifier (NPI) is 1235161779, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Irena Maier, M.D. located?
The NPPES record lists a practice address at 133 Brookline Ave, Boston, MA, 02215. Phone: (617) 421-1091. Providers update this record themselves, so call before visiting.
How can I verify Irena Maier, M.D.'s license?
NPPES lists Massachusetts license number 219818, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Irena Maier, M.D. prescribe under Medicare Part D?
In 2024, Irena Maier, M.D. had 1,423 Medicare Part D claims for 633 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.