Marc Sherwin
NPI 1023435476 · Anesthesiology Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Sherwin is a Anesthesiology Physician provider in New Haven, CT (NPI 1023435476).
Provider details
- NPI number
- 1023435476
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 291705 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
38 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 14 | $48 |
| Anesthesia for Other Procedure on Upper Abdomen00790 | 12 | $427 |
| Injection of Local Anesthetic for Abdominal Wall Pain Control on Both Sides Using Imaging Guidance64488 | 12 | $74 |
Typical Medicare-allowed amounts for these services range $48–$427 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$763 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1 Gustave L Levy PlAnesthsiology DeptNew York, NY 10029-6500Phone: (212) 241-6426Fax: (212) 876-3906
Registry dates
- Enumerated
- 2014-03-24
- Last updated
- 2025-06-04
- Certified
- 2025-06-04
Frequently asked questions
- What is Marc Sherwin's NPI number?
- Marc Sherwin's National Provider Identifier (NPI) is 1023435476, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Sherwin's specialty?
- Marc Sherwin is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Sherwin located?
- Marc Sherwin's practice location on file with NPPES is 20 York St, New Haven, CT 06510.
- What is Marc Sherwin's phone number?
- The practice phone number listed in the NPPES registry for Marc Sherwin is (203) 785-2802.
- Does Marc Sherwin accept Medicare?
- Marc Sherwin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Sherwin's NPI active?
- Yes — Marc Sherwin's NPI (1023435476) is active in the NPPES registry as of the last update on 2025-06-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.