Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Darwin Dale Ristow, O.D.

Optometrist in Alpena, MI · enumerated 2006 · practices at Robert E Thompson MD and Associates Pllc.

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

National Provider Identifier

1134230543

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Registry record

Entity type Individual (Type 1)

Name Dr. Darwin Dale Ristow

Credential O.D.

Sex Male

Practice address Alpena, MI, 49707

Phone (989) 354-8552

Enumeration date Aug 31, 2006

Last updated in NPPES Jul 9, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 4901002206 (MI) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Darwin Ristow practice?

The practice location on file with NPPES is in Alpena, MI. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Darwin Ristow?

The National Provider Identifier (NPI) for Darwin Ristow is 1134230543, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Robert E Thompson MD and Associates Pllc Family Medicine Physician · Alpena, MI NPI 1841414745

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.