William Riordan, DO
NPI 1447259718 · Diagnostic Radiology Physician · Petoskey, MI
William Riordan, DO is a Diagnostic Radiology Physician provider in Petoskey, MI (NPI 1447259718).
Provider details
- NPI number
- 1447259718
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 5101010779 (MI)
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
- 2005-07-19
- Last updated
- 2018-08-13
Frequently asked questions
- What is William Riordan's NPI number?
- William Riordan's National Provider Identifier (NPI) is 1447259718, 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 Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Riordan located?
- William Riordan's practice location on file with NPPES is 416 Connable Ave, Petoskey, MI 49770-2212.
- What is William Riordan's phone number?
- The practice phone number listed in the NPPES registry for William Riordan is (231) 487-4000.
- Is William Riordan's NPI active?
- Yes — William Riordan's NPI (1447259718) is active in the NPPES registry as of the last update on 2018-08-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.