What is Louis Marks's NPI number?

Louis Marks's National Provider Identifier (NPI) is 1588660468, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Louis Marks's specialty?

Louis Marks is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).

Where is Louis Marks located?

Louis Marks's practice location on file with NPPES is 3230 Eagle Park Dr Ne, Grand Rapids, MI 49525-7007.

What is Louis Marks's phone number?

The practice phone number listed in the NPPES registry for Louis Marks is (616) 949-7079.

Is Louis Marks's NPI active?

Yes — Louis Marks's NPI (1588660468) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

Louis Marks, M.D.

NPI 1588660468 · Hematology (Internal Medicine) Physician · Grand Rapids, MI

Louis Marks, M.D. is a Hematology (Internal Medicine) Physician provider in Grand Rapids, MI (NPI 1588660468).

Provider details

NPI number: 1588660468
Entity type: Individual
Primary specialty: Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
License: LM052570 (MI)

Specialties & taxonomies

Hematology (Internal Medicine) PhysicianPrimary207RH0000XLicense LM052570 (MI)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
21 yrs in NPPES registry
Profile completeness38% of score
100% 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

3230 Eagle Park Dr Ne

Grand Rapids, MI 49525-7007

Phone: (616) 949-7079

Fax: (616) 949-1887

Street-level locationGet directions

More MI providers

Mailing address

900 Arthur Ct

Hastings, MI 49058-9621

Enumerated: 2005-06-24
Last updated: 2007-07-08

Frequently asked questions

What is Louis Marks's NPI number?: Louis Marks's National Provider Identifier (NPI) is 1588660468, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Louis Marks's specialty?: Louis Marks is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
Where is Louis Marks located?: Louis Marks's practice location on file with NPPES is 3230 Eagle Park Dr Ne, Grand Rapids, MI 49525-7007.
What is Louis Marks's phone number?: The practice phone number listed in the NPPES registry for Louis Marks is (616) 949-7079.
Is Louis Marks's NPI active?: Yes — Louis Marks's NPI (1588660468) is active in the NPPES registry as of the last update on 2007-07-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.