Kelsy Greenwald, MD
NPI 1578093720 · Emergency Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kelsy Greenwald, MD is a Emergency Medicine Physician provider in Boston, MA (NPI 1578093720).
Provider details
- NPI number
- 1578093720
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 272911 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
283 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 156 | $178 |
| Critical Care, First 30-74 Minutes99291 | 67 | $209 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 41 | $126 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 19 | $73 |
Typical Medicare-allowed amounts for these services range $73–$209 (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
Additional practice locations (1)
- 1850 Town Center PkwyReston, VA 20190-3204Phone: (240) 686-2300
Registry dates
- Enumerated
- 2017-06-19
- Last updated
- 2021-07-26
- Certified
- 2021-07-26
Frequently asked questions
- What is Kelsy Greenwald's NPI number?
- Kelsy Greenwald's National Provider Identifier (NPI) is 1578093720, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kelsy Greenwald's specialty?
- Kelsy Greenwald is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kelsy Greenwald located?
- Kelsy Greenwald's practice location on file with NPPES is Massachusetts General Hospital, Boston, MA 02114.
- What is Kelsy Greenwald's phone number?
- The practice phone number listed in the NPPES registry for Kelsy Greenwald is (617) 724-4184.
- Does Kelsy Greenwald accept Medicare?
- Kelsy Greenwald is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kelsy Greenwald's NPI active?
- Yes — Kelsy Greenwald's NPI (1578093720) is active in the NPPES registry as of the last update on 2021-07-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.