Nathaniel Greenbaum, MD
NPI 1952832206 · Anesthesiology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathaniel Greenbaum, MD is a Anesthesiology Physician provider in Boston, MA (NPI 1952832206).
Provider details
- NPI number
- 1952832206
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 286819 (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
9 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
78 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) |
|---|---|---|
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 30 | $110 |
| Anesthesia for Electroshock Therapy00104 | 27 | $115 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 21 | $98 |
Typical Medicare-allowed amounts for these services range $98–$115 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-03-27
- Last updated
- 2021-09-22
- Certified
- 2021-09-22
Frequently asked questions
- What is Nathaniel Greenbaum's NPI number?
- Nathaniel Greenbaum's National Provider Identifier (NPI) is 1952832206, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathaniel Greenbaum's specialty?
- Nathaniel Greenbaum is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Nathaniel Greenbaum located?
- Nathaniel Greenbaum's practice location on file with NPPES is 330 Brookline Ave, Boston, MA 02215-5400.
- What is Nathaniel Greenbaum's phone number?
- The practice phone number listed in the NPPES registry for Nathaniel Greenbaum is (617) 667-7000.
- Does Nathaniel Greenbaum accept Medicare?
- Nathaniel Greenbaum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathaniel Greenbaum's NPI active?
- Yes — Nathaniel Greenbaum's NPI (1952832206) is active in the NPPES registry as of the last update on 2021-09-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.