Mark Kassis, M.D.
NPI 1356309744 · Internal Medicine Physician · Springfield, MA
Mark Kassis, M.D. is a Internal Medicine Physician provider in Springfield, MA (NPI 1356309744).
Provider details
- NPI number
- 1356309744
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 72426 (MA)
Specialties & taxonomies
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
- 2006-05-03
- Last updated
- 2017-02-24
Frequently asked questions
- What is Mark Kassis's NPI number?
- Mark Kassis's National Provider Identifier (NPI) is 1356309744, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Kassis's specialty?
- Mark Kassis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Kassis located?
- Mark Kassis's practice location on file with NPPES is 3400 Main St, Springfield, MA 01107-1113.
- What is Mark Kassis's phone number?
- The practice phone number listed in the NPPES registry for Mark Kassis is (413) 794-9560.
- Is Mark Kassis's NPI active?
- Yes — Mark Kassis's NPI (1356309744) is active in the NPPES registry as of the last update on 2017-02-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.