Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Maxwell Irving Mayer, M.D.

Psychiatry Physician in Fall River, MA · enumerated 2012.

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

National Provider Identifier

1609123207

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Registry record

Entity type Individual (Type 1)

Name Dr. Maxwell Irving Mayer

Credential M.D.

Sex Male

Practice address Fall River, MA, 02720

Phone (508) 235-7333

Enumeration date Aug 14, 2012

Last updated in NPPES Dec 13, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 274121 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 does Maxwell Mayer practice?

The practice location on file with NPPES is in Fall River, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Maxwell Mayer?

The National Provider Identifier (NPI) for Maxwell Mayer is 1609123207, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-12-13.