Mallory Grosso
NPI 1558833160 · Medical Physician Assistant · New York, NY
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mallory Grosso is a Medical Physician Assistant provider in New York, NY (NPI 1558833160).
Provider details
- NPI number
- 1558833160
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
- Physician Assistant363A00000X
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
105 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 76 | $185 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 17 | $104 |
| Critical Care, Each Additional 30 Minutes99292 | 12 | $93 |
Typical Medicare-allowed amounts for these services range $93–$185 (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 (2)
- 20 York StNew Haven, CT 06510-3220Phone: (203) 688-4242
- 34 Maple StNorwalk, CT 06850-3815Phone: (203) 852-2000
Registry dates
- Enumerated
- 2018-12-20
- Last updated
- 2021-03-03
- Certified
- 2021-03-03
Frequently asked questions
- What is Mallory Grosso's NPI number?
- Mallory Grosso's National Provider Identifier (NPI) is 1558833160, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mallory Grosso's specialty?
- Mallory Grosso is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mallory Grosso located?
- Mallory Grosso's practice location on file with NPPES is 1275 York Ave, New York, NY 10065-6007.
- What is Mallory Grosso's phone number?
- The practice phone number listed in the NPPES registry for Mallory Grosso is (212) 639-2000.
- Does Mallory Grosso accept Medicare?
- Mallory Grosso is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mallory Grosso's NPI active?
- Yes — Mallory Grosso's NPI (1558833160) is active in the NPPES registry as of the last update on 2021-03-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.