Irena Maier, M.D.
NPI 1235161779 · Gastroenterology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irena Maier, M.D. is a Gastroenterology Physician provider in Boston, MA (NPI 1235161779).
Provider details
- NPI number
- 1235161779
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 219818 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,305 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 265 | $305 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 145 | $497 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 130 | $9 |
| Liver Function Blood Test Panel80076 | 75 | $8 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 65 | $8 |
| Blood Creatinine Level82565 | 61 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 172 | 65 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 168 | 161 |
| Peg3350/Sod Sul/Nacl/Kcl/Asb/Cbrand: Peg3350-Sod Sul-Nacl-Kcl-Asb-C | 160 | 155 |
| Famotidine | 140 | 48 |
| Pantoprazole Sodium | 113 | 39 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 70 | 69 |
| Mesalamine |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-07
- Last updated
- 2021-01-07
- Certified
- 2021-01-07
Frequently asked questions
- What is Irena Maier's NPI number?
- Irena Maier's National Provider Identifier (NPI) is 1235161779, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irena Maier's specialty?
- Irena Maier is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Irena Maier located?
- Irena Maier's practice location on file with NPPES is 133 Brookline Ave, Boston, MA 02215-3904.
- What is Irena Maier's phone number?
- The practice phone number listed in the NPPES registry for Irena Maier is (617) 421-1091.
- Does Irena Maier accept Medicare?
- Irena Maier is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irena Maier's NPI active?
- Yes — Irena Maier's NPI (1235161779) is active in the NPPES registry as of the last update on 2021-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.