Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Crystal

Q: What is the NPI number for Mark Crystal?

The National Provider Identifier (NPI) for Mark Crystal is 1336840123, a Type 1 (individual) record in the CMS NPPES registry.

Registered Nurse in Grand Rapids, MI · enumerated 2023 · practices at Maxim Healthcare Services, Inc..

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

National Provider Identifier

1336840123

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Registry record

Entity type Individual (Type 1)

Name Mark Crystal

Sex Male

Practice address 5300 Patterson Ave Se Ste 100e, Grand Rapids, MI, 49512

Phone (616) 222-5601

Enumeration date Mar 17, 2023

Last updated in NPPES Mar 17, 2023

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 4704352340 (MI) Primary

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.

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Frequently asked questions

Where does Mark Crystal 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 Mark Crystal?

The National Provider Identifier (NPI) for Mark Crystal is 1336840123, 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 2023-03-17.