William Riordan, P.A.
NPI 1871628487 · Physician Assistant · Roslyn, NY
William Riordan, P.A. is a Physician Assistant provider in Roslyn, NY (NPI 1871628487).
Provider details
- NPI number
- 1871628487
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- P.A.
- Sex
- Male
- Sole proprietor
- No
- License
- 000197 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
- 2007-02-22
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Riordan's NPI number?
- William Riordan's National Provider Identifier (NPI) is 1871628487, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Riordan's specialty?
- William Riordan is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Riordan located?
- William Riordan's practice location on file with NPPES is 100 Port Washington Blvd, Roslyn, NY 11576-1353.
- What is William Riordan's phone number?
- The practice phone number listed in the NPPES registry for William Riordan is (516) 338-5300.
- Is William Riordan's NPI active?
- Yes — William Riordan's NPI (1871628487) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.