What is Sidney Marsman's NPI number?

Sidney Marsman's National Provider Identifier (NPI) is 1205792686, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Sidney Marsman's specialty?

Sidney Marsman is listed in the NPPES registry with a primary specialty of Case Manager/Care Coordinator (Other Service Providers).

Where is Sidney Marsman located?

Sidney Marsman's practice location on file with NPPES is 790 Fuller Ave Ne, Grand Rapids, MI 49503-1918.

What is Sidney Marsman's phone number?

The practice phone number listed in the NPPES registry for Sidney Marsman is (616) 336-3909.

Is Sidney Marsman's NPI active?

Yes — Sidney Marsman's NPI (1205792686) is active in the NPPES registry as of the last update on 2025-12-30.

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Sidney Marsman

NPI 1205792686 · Case Manager/Care Coordinator · Grand Rapids, MI

Sidney Marsman is a Case Manager/Care Coordinator provider in Grand Rapids, MI (NPI 1205792686).

Provider details

NPI number: 1205792686
Entity type: Individual
Primary specialty: Case Manager/Care CoordinatorOther Service Providers
Sex: Female
Sole proprietor: Yes

Specialties & taxonomies

Case Manager/Care CoordinatorPrimary171M00000X
Other Service Providers

Profile Score

Basic profile(47/100 index)

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

Registry tenure38% of score
Under 1 yr in 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

790 Fuller Ave Ne

Grand Rapids, MI 49503-1918

Phone: (616) 336-3909

Fax: (616) 336-8830

Street-level locationGet directions

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Mailing address