Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Comprehensive Outpatient Services, Inc

Community/Behavioral Health Agency in Fitchburg, MA · enumerated 2007 · authorized official Bruce Mermelstein, President.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1083742365

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Comprehensive Outpatient Services, Inc

Other name <Unavail>

Parent organization Comprehensive Outpatient Services Inc

Practice address 76 Summer St, Fitchburg, MA, 01420

Phone (978) 345-6729

Fax (978) 342-7503

Enumeration date Mar 1, 2007

Last updated in NPPES Aug 16, 2013

Taxonomy & classification

101Y00000X Counselor Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

101YS0200X School Counselor Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103TA0400X Addiction (Substance Use Disorder) Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103TC2200X Clinical Child & Adolescent Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103TF0000X Family Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

103TP2701X Group Psychotherapy Psychologist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 4196 (MA) Secondary

163WP0807X Child & Adolescent Psychiatric/Mental Health Registered Nurse Nursing Service Providers · License 4196 (MA) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 4196 (MA) Secondary

251S00000X Community/Behavioral Health Agency Agencies · License 4196 (MA) Primary

Authorized official

Name Bruce Mermelstein

Title President

Phone (617) 527-4610

Other identifiers

Identifier	Type	State	Issuer
701784	Other	MA	TUFTS
1000930	Other	MA	BEACON
1300491	Medicaid	MA	-
600022632	Other	MA	MAGELLAN
M18559	Other	MA	BCBS
M18560	Other	MA	BCBS
M18561	Other	MA	BCBS
M21821	Other	MA	GROUP P TAN

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.

Read the full guide → Validate an NPI →

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2013-08-16. Verify at npiregistry.cms.hhs.gov.

Where is Comprehensive Outpatient Services, Inc located?

The practice location on file with NPPES is in Fitchburg, MA.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-16.