Marshall Lassman, MD
NPI 1629040357 · Endocrinology, Diabetes & Metabolism Physician · Hartford, CT
Marshall Lassman, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Hartford, CT (NPI 1629040357).
Provider details
- NPI number
- 1629040357
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 015106 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
- 2006-02-06
- Last updated
- 2023-03-07
Frequently asked questions
- What is Marshall Lassman's NPI number?
- Marshall Lassman's National Provider Identifier (NPI) is 1629040357, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marshall Lassman's specialty?
- Marshall Lassman is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Marshall Lassman located?
- Marshall Lassman's practice location on file with NPPES is 1000 Asylum Ave, Hartford, CT 06105-1770.
- What is Marshall Lassman's phone number?
- The practice phone number listed in the NPPES registry for Marshall Lassman is (860) 247-2137.
- Is Marshall Lassman's NPI active?
- Yes — Marshall Lassman's NPI (1629040357) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.