Niraj Mahajan, M.D.
NPI 1285825331 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1285825331
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 36114440 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tiotropium Bromidebrand: Spiriva Respimat | 122 | 31 |
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 106 | 46 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 95 | 40 |
| Prednisone | 85 | 44 |
| Azelastine Hcl | 55 | 15 |
| Azithromycin | 41 | 23 |
| Pirfenidone | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-05
- Last updated
- 2021-11-04
- Certified
- 2021-11-04
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.