Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Paul Leonard Grindstaff, MD

Neurology Physician in Crystal Lake, IL · enumerated 2006.

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

National Provider Identifier

1811948854

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Registry record

Entity type Individual (Type 1)

Name Mr. Paul Leonard Grindstaff

Credential MD

Sex Male

Practice address 750 East Terra Cotta Ave, Suite A, Crystal Lake, IL, 60014

Phone (815) 455-1800

Fax (815) 455-1875

Enumeration date May 15, 2006

Last updated in NPPES Oct 19, 2018

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 336071769 (IL) 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
336071769	Medicaid	IL	-
036110902	Other	IL	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Paul Grindstaff?

Paul Grindstaff is registered in NPPES with the primary taxonomy of Neurology 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-10-19.