Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James A. Day, M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Springfield, MO · enumerated 2006.

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

National Provider Identifier

1225097488

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Registry record

Entity type Individual (Type 1)

Name James A. Day

Credential M.D.

Sex Male

Practice address 1235 E Cherokee St, Springfield, MO, 65804

Phone (417) 820-3960

Enumeration date Mar 17, 2006

Last updated in NPPES Dec 17, 2020

Taxonomy & licenses

174400000X Specialist Other Service Providers · License E1620 (AR) Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License E-1620 (AR) Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 2020041272 (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
133576001	Medicaid	AR	-
E1620	Other	AR	STATE LICENSE

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

What specialty is James Day?

James Day is registered in NPPES with the primary taxonomy of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-17.