Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Constance B Diekman, RD

Registered Dietitian in Saint Louis, MO · enumerated 2007 · practices at Washington University in St. Louis.

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

National Provider Identifier

1952455198

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Registry record

Entity type Individual (Type 1)

Name Ms. Constance B Diekman

Credential RD

Sex Female

Practice address 1 Brookings Dr, Saint Louis, MO, 63130

Phone (314) 935-6666

Fax (314) 935-8515

Enumeration date Jan 23, 2007

Last updated in NPPES Jan 24, 2018

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 2000172606 (MO) Primary

RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration. About the RD 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

What is the NPI number for Constance Diekman?

The National Provider Identifier (NPI) for Constance Diekman is 1952455198, a Type 1 (individual) record in the CMS NPPES registry.

Where does Constance Diekman practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-24.