What is John O'Brien's NPI number?

John O'Brien's National Provider Identifier (NPI) is 1881934891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is John O'Brien's specialty?

John O'Brien is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).

Where is John O'Brien located?

John O'Brien's practice location on file with NPPES is 1233 Main St, Holyoke, MA 01040-5381.

What is John O'Brien's phone number?

The practice phone number listed in the NPPES registry for John O'Brien is (413) 493-2734.

Is John O'Brien's NPI active?

Yes — John O'Brien's NPI (1881934891) is active in the NPPES registry as of the last update on 2013-02-28.

IndividualActive

John O'Brien

NPI 1881934891 · Addiction (Substance Use Disorder) Counselor · Holyoke, MA

John O'Brien is a Addiction (Substance Use Disorder) Counselor provider in Holyoke, MA (NPI 1881934891).

Provider details

NPI number: 1881934891
Entity type: Individual
Primary specialty: Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Addiction (Substance Use Disorder) CounselorPrimary101YA0400X
Behavioral Health & Social Service Providers

Profile Score

Established profile(72/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
13 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

1233 Main St

Holyoke, MA 01040-5381

Phone: (413) 493-2734

Fax: (413) 493-2783

Street-level locationGet directions

More MA providers

Mailing address

Po Box 426

Lenox, MA 01240-0426

Enumerated: 2013-02-28
Last updated: 2013-02-28

Frequently asked questions

What is John O'Brien's NPI number?: John O'Brien's National Provider Identifier (NPI) is 1881934891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is John O'Brien's specialty?: John O'Brien is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
Where is John O'Brien located?: John O'Brien's practice location on file with NPPES is 1233 Main St, Holyoke, MA 01040-5381.
What is John O'Brien's phone number?: The practice phone number listed in the NPPES registry for John O'Brien is (413) 493-2734.
Is John O'Brien's NPI active?: Yes — John O'Brien's NPI (1881934891) is active in the NPPES registry as of the last update on 2013-02-28.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.