Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Melissa Robbins Mahr, M.D.

Q: What is the NPI number for Melissa Mahr?

The National Provider Identifier (NPI) for Melissa Mahr is 1164441705, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Hopkinton, MA · enumerated 2006.

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

National Provider Identifier

1164441705

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Registry record

Entity type Individual (Type 1)

Name Melissa Robbins Mahr

Credential M.D.

Sex Female

Practice address 77 W Main St Ste 204, Hopkinton, MA, 01748

Phone (508) 731-2570

Fax (508) 544-2859

Enumeration date Jul 18, 2006

Last updated in NPPES Sep 3, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 205104 (MA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
2080010	Medicaid	MA	-

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 Melissa Mahr practice?

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

What is the NPI number for Melissa Mahr?

The National Provider Identifier (NPI) for Melissa Mahr is 1164441705, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-03.