Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Bay Medical Systems Associates LLC

Addiction Medicine (Internal Medicine) Physician in Millbury, MA · enumerated 2018 · authorized official Joseph Chelales, Administrator.

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

National Provider Identifier

1154804698

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Registry record

Entity type Organization (Type 2)

Legal business name Bay Medical Systems Associates LLC

Practice address 29 Main St Ste 101, Millbury, MA, 01527

Phone (508) 388-5563

Fax (508) 635-9658

Enumeration date Sep 11, 2018

Last updated in NPPES Sep 11, 2018

Taxonomy & classification

207RA0401X Addiction Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Joseph Chelales

Title Administrator

Phone (646) 285-4035

Other identifiers

Identifier	Type	State	Issuer
XX-XXX5436	Other	MA	TIN

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

Where is Bay Medical Systems Associates LLC located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2018-09-11. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-11.