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Leonard A Mermel, DO

Infectious Disease Physician in Providence, RI · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1225078421

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Registry record

Entity type Individual (Type 1)
Name Leonard A Mermel
Credential DO
Sex Male
Practice address 110 Lockwood St, Suite 116, Providence, RI, 02903
Phone (401) 793-2985
Fax (401) 793-4351
Enumeration date Jun 7, 2006
Last updated in NPPES Jun 7, 2013

Taxonomy & licenses

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License DO00410 (RI) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is NPI 1225078421 active?
Yes, as of the latest NPPES snapshot, NPI 1225078421 is active (record last updated 2013-06-07).
How do I verify Leonard Mermel's NPI record?
Cross-check NPI 1225078421 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-07.