Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Howard Russell Day Jr., MD

Q: What is the NPI number for Howard Day?

The National Provider Identifier (NPI) for Howard Day is 1639799513, a Type 1 (individual) record in the CMS NPPES registry.

Ophthalmology Physician in Nashville, TN · enumerated 2020 · practices at Vanderbilt University Medical Center.

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

National Provider Identifier

1639799513

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Registry record

Entity type Individual (Type 1)

Name Dr. Howard Russell Day Jr.

Credential MD

Sex Male

Practice address 2311 Pierce Ave, Nashville, TN, 37232

Phone (615) 936-2020

Enumeration date Apr 21, 2020

Last updated in NPPES May 22, 2024

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 48287 (AL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 Howard Day practice?

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

What is the NPI number for Howard Day?

The National Provider Identifier (NPI) for Howard Day is 1639799513, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-22.