William Cassidy, M.D.
NPI 1114959384 · Internal Medicine Physician · Annapolis, MD
William Cassidy, M.D. is a Internal Medicine Physician provider in Annapolis, MD (NPI 1114959384).
Provider details
- NPI number
- 1114959384
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0019120 (MD)
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
- 2006-07-07
- Last updated
- 2012-04-12
Frequently asked questions
- What is William Cassidy's NPI number?
- William Cassidy's National Provider Identifier (NPI) is 1114959384, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Cassidy's specialty?
- William Cassidy is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Cassidy located?
- William Cassidy's practice location on file with NPPES is 820 Bestgate Road, Annapolis, MD 21401.
- What is William Cassidy's phone number?
- The practice phone number listed in the NPPES registry for William Cassidy is (410) 224-2116.
- Is William Cassidy's NPI active?
- Yes — William Cassidy's NPI (1114959384) is active in the NPPES registry as of the last update on 2012-04-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.