IndividualActive
Mark Longsjo, LICSW
NPI 1013949809 · Clinical Social Worker · Brockton, MA
Mark Longsjo, LICSW is a Clinical Social Worker provider in Brockton, MA (NPI 1013949809).
Provider details
- NPI number
- 1013949809
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LICSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 1026908 (MA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(91/100 index)
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
Mclean Hospital Southeast Location
940 Belmont Street
Brockton, MA 02301
Phone: (508) 894-8320
Fax: (508) 894-8334
Approximate (ZIP-level) locationGet directions
Mailing address
115 Mill St
Belmont, MA 02478-1041
Registry dates
- Enumerated
- 2006-07-06
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Longsjo's NPI number?
- Mark Longsjo's National Provider Identifier (NPI) is 1013949809, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Longsjo's specialty?
- Mark Longsjo is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Longsjo located?
- Mark Longsjo's practice location on file with NPPES is Mclean Hospital Southeast Location, Brockton, MA 02301.
- What is Mark Longsjo's phone number?
- The practice phone number listed in the NPPES registry for Mark Longsjo is (508) 894-8320.
- Is Mark Longsjo's NPI active?
- Yes — Mark Longsjo's NPI (1013949809) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.