Aaron Birnbaum
NPI 1023645249 · Internal Medicine Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aaron Birnbaum is a Internal Medicine Physician provider in Cambridge, MA (NPI 1023645249).
Provider details
- NPI number
- 1023645249
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
575 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 101 | $110 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 90 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 82 | $85 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 42 | $16 |
| Hemoglobin A1c Level83036 | 34 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 31 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 70 | 27 |
| Atorvastatin Calcium | 68 | 28 |
| Lisinopril | 31 | 15 |
| Clonazepam | 25 | — |
| Rosuvastatin Calcium | 24 | 12 |
| Apixabanbrand: Eliquis | 19 | — |
| Hydrochlorothiazide |
Practice location
Mailing address
Additional practice locations (1)
- 1493 Cambridge StCambridge, MA 02139-1047Phone: (617) 665-1000
Registry dates
- Enumerated
- 2020-03-26
- Last updated
- 2023-09-21
- Certified
- 2023-09-20
Frequently asked questions
- What is Aaron Birnbaum's NPI number?
- Aaron Birnbaum's National Provider Identifier (NPI) is 1023645249, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aaron Birnbaum's specialty?
- Aaron Birnbaum is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Aaron Birnbaum located?
- Aaron Birnbaum's practice location on file with NPPES is 1611 Cambridge St, Cambridge, MA 02138-4302.
- What is Aaron Birnbaum's phone number?
- The practice phone number listed in the NPPES registry for Aaron Birnbaum is (617) 661-5100.
- Does Aaron Birnbaum accept Medicare?
- Aaron Birnbaum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aaron Birnbaum's NPI active?
- Yes — Aaron Birnbaum's NPI (1023645249) is active in the NPPES registry as of the last update on 2023-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.