Leonard Mermel, DO
NPI 1225078421 · Infectious Disease Physician · Providence, RI
Leonard Mermel, DO is a Infectious Disease Physician provider in Providence, RI (NPI 1225078421).
Provider details
- NPI number
- 1225078421
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- DO00410 (RI)
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
20 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
- 2006-06-07
- Last updated
- 2013-06-07
Frequently asked questions
- What is Leonard Mermel's NPI number?
- Leonard Mermel's National Provider Identifier (NPI) is 1225078421, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Mermel's specialty?
- Leonard Mermel is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Mermel located?
- Leonard Mermel's practice location on file with NPPES is 110 Lockwood St, Providence, RI 02903-4801.
- What is Leonard Mermel's phone number?
- The practice phone number listed in the NPPES registry for Leonard Mermel is (401) 793-2985.
- Is Leonard Mermel's NPI active?
- Yes — Leonard Mermel's NPI (1225078421) is active in the NPPES registry as of the last update on 2013-06-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.