Leonard Rosoff, M.D.
NPI 1730533001 · Internal Medicine Physician · Mercer Island, WA
Leonard Rosoff, M.D. is a Internal Medicine Physician provider in Mercer Island, WA (NPI 1730533001).
Provider details
- NPI number
- 1730533001
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 14970 (WA)
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
10 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
- 2016-04-22
- Last updated
- 2016-04-22
Frequently asked questions
- What is Leonard Rosoff's NPI number?
- Leonard Rosoff's National Provider Identifier (NPI) is 1730533001, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Rosoff's specialty?
- Leonard Rosoff is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Rosoff located?
- Leonard Rosoff's practice location on file with NPPES is 5407 W Mercer Way, Mercer Island, WA 98040-4635.
- What is Leonard Rosoff's phone number?
- The practice phone number listed in the NPPES registry for Leonard Rosoff is (206) 232-3940.
- Is Leonard Rosoff's NPI active?
- Yes — Leonard Rosoff's NPI (1730533001) is active in the NPPES registry as of the last update on 2016-04-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.