Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Marcus Williams
Behavior Technician in Groton, CT · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1205341138
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Registry record
Entity type Individual (Type 1)
Name Mr. Marcus Williams
Sex Male
Practice address 220 Route 12 Ste 205, Groton, CT, 06340
Phone (877) 315-8080
Enumeration date Dec 14, 2017
Last updated in NPPES Dec 14, 2017
Taxonomy & licenses
106S00000X Behavior Technician Behavioral Health & Social Service Providers · License RBT-16-27657 (CT) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| RBT-16-27657 | Other | CT | BCBA |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What is the NPI number for Marcus Williams?
The National Provider Identifier (NPI) for Marcus Williams is 1205341138, a Type 1 (individual) record in the CMS NPPES registry.
Where does Marcus Williams practice?
The practice location on file with NPPES is in Groton, CT. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Chelsea Shaw Behavior Technician · Groton, CT NPI 1750896296 Bobbi Peck Behavior Technician · Groton, CT NPI 1194230482 Julie Sampson Behavior Technician · Groton, CT NPI 1497261275 Amanda Wheeler Behavior Analyst · Groton, CT NPI 1780171561 Megan Murray Behavior Technician · Groton, CT NPI 1003779083
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-12-14.