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

Dr. Erin Lager, M.D.

Q: What is the NPI number for Erin Lager?

The National Provider Identifier (NPI) for Erin Lager is 1861849192, a Type 1 (individual) record in the CMS NPPES registry.

Pediatrics Physician in Chelmsford, MA · enumerated 2016.

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

National Provider Identifier

1861849192

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Registry record

Entity type Individual (Type 1)

Name Dr. Erin Lager

Credential M.D.

Sex Female

Practice address Chelmsford, MA, 01824

Phone (978) 250-6000

Enumeration date May 17, 2016

Last updated in NPPES Jun 21, 2019

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

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License LP03591 (RI) 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

What is the NPI number for Erin Lager?

The National Provider Identifier (NPI) for Erin Lager is 1861849192, a Type 1 (individual) record in the CMS NPPES registry.

Where does Erin Lager practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-21.