Nicholas Mercadante, M.D.
NPI 1821005943 · Cardiovascular Disease Physician · Leominster, MA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicholas Mercadante, M.D. is a Cardiovascular Disease Physician provider in Leominster, MA (NPI 1821005943).
Provider details
- NPI number
- 1821005943
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 48638 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-02
- Last updated
- 2010-09-07
Frequently asked questions
- What is Nicholas Mercadante's NPI number?
- Nicholas Mercadante's National Provider Identifier (NPI) is 1821005943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Mercadante's specialty?
- Nicholas Mercadante is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Nicholas Mercadante located?
- Nicholas Mercadante's practice location on file with NPPES is 100 Hospital Rd, Leominster, MA 01453-2253.
- What is Nicholas Mercadante's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Mercadante is (978) 534-3179.
- Does Nicholas Mercadante accept Medicare?
- Nicholas Mercadante is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicholas Mercadante's NPI active?
- Yes — Nicholas Mercadante's NPI (1821005943) is active in the NPPES registry as of the last update on 2010-09-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.