Mark Geist
NPI 1558677427 · Social Worker · Boston, MA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Geist is a Social Worker provider in Boston, MA (NPI 1558677427).
Provider details
- NPI number
- 1558677427
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2010-08-29
- Last updated
- 2021-06-04
- Certified
- 2021-06-03
Frequently asked questions
- What is Mark Geist's NPI number?
- Mark Geist's National Provider Identifier (NPI) is 1558677427, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Geist's specialty?
- Mark Geist is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Geist located?
- Mark Geist's practice location on file with NPPES is 50 Redfield St Ste 300, Boston, MA 02122-3653.
- What is Mark Geist's phone number?
- The practice phone number listed in the NPPES registry for Mark Geist is (617) 288-7450.
- Does Mark Geist accept Medicare?
- Mark Geist is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Geist's NPI active?
- Yes — Mark Geist's NPI (1558677427) is active in the NPPES registry as of the last update on 2021-06-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.