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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Ralph J Duda Jr., M.D.

Endocrinology, Diabetes & Metabolism Physician in Springfield, MO · enumerated 2006.

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

National Provider Identifier

1356436406

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Registry record

Entity type Individual (Type 1)
Name Mr. Ralph J Duda Jr.
Credential M.D.
Sex Male
Practice address 909 E Republic Rd Ste D200, Springfield, MO, 65807
Phone (417) 883-7889
Fax (417) 890-6151
Enumeration date Oct 4, 2006
Last updated in NPPES Apr 13, 2022

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License R7G82 (MO) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
P00266673 Other - PTAN
16610 Other MO BLUE CROSS BLUE SHIELD

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.

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Frequently asked questions

How do I verify Ralph Duda's NPI record?
Cross-check NPI 1356436406 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1356436406 active?
Yes, as of the latest NPPES snapshot, NPI 1356436406 is active (record last updated 2022-04-13).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-04-13.