Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Joseph Lake, DO

Pediatric Hematology & Oncology Physician in Grand Rapids, MI · enumerated 2017.

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

National Provider Identifier

1255860789

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Registry record

Entity type Individual (Type 1)

Name Alexander Joseph Lake

Credential DO

Sex Male

Practice address 35 Michigan St Ne Fl 2, Grand Rapids, MI, 49503

Phone (616) 267-1925

Fax (616) 267-1005

Enumeration date Jun 8, 2017

Last updated in NPPES May 8, 2025

Taxonomy & licenses

2080P0207X Pediatric Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 5101025698 (MI) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 Alexander Lake practice?

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

What is the NPI number for Alexander Lake?

The National Provider Identifier (NPI) for Alexander Lake is 1255860789, 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 2025-05-08.