Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Gretchen Lynn Koster

Individual provider Mental Health Counselor · NPI 1558151720

Gretchen Lynn Koster is a Mental Health Counselor in Holland, Michigan. Registered with an NPI since 2025.

In the registry since
2025

Practice location Address checks out

217 E 24th St Ste 201
Holland, MI 49423-4973
Phone: (616) 258-0287
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X

Record details

NPI number1558151720
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedMay 9, 2025
Last updated in NPPESMay 9, 2025
Certification dateMay 9, 2025
Mailing address217 E 24th St Ste 201, Holland, MI 49423-4973

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