What is Gretchen Koster's NPI number?

Gretchen Koster's National Provider Identifier (NPI) is 1558151720, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Gretchen Koster's specialty?

Gretchen Koster is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).

Where is Gretchen Koster located?

Gretchen Koster's practice location on file with NPPES is 217 E 24th St Ste 201, Holland, MI 49423-4973.

What is Gretchen Koster's phone number?

The practice phone number listed in the NPPES registry for Gretchen Koster is (616) 258-0287.

Is Gretchen Koster's NPI active?

Yes — Gretchen Koster's NPI (1558151720) is active in the NPPES registry as of the last update on 2025-05-09.

IndividualActive

Gretchen Koster

NPI 1558151720 · Mental Health Counselor · Holland, MI

Gretchen Koster is a Mental Health Counselor provider in Holland, MI (NPI 1558151720).

Provider details

NPI number: 1558151720
Entity type: Individual
Primary specialty: Mental Health CounselorBehavioral Health & Social Service Providers
Sex: Female
Sole proprietor: No

Specialties & taxonomies

Mental Health CounselorPrimary101YM0800X
Behavioral Health & Social Service Providers

Profile Score

Basic profile(48/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

217 E 24th St Ste 201

Holland, MI 49423-4973

Phone: (616) 258-0287

Street-level locationGet directions

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Mailing address