Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Charles Frederick Opalak, M.D.

Neurological Surgery Physician in Greenville, SC · enumerated 2015 · practices at Greenville Health Corporation.

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

National Provider Identifier

1821484882

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Registry record

Entity type Individual (Type 1)

Name Dr. Charles Frederick Opalak

Credential M.D.

Sex Male

Practice address 111 Doctors Dr, Greenville, SC, 29605

Phone (864) 797-7150

Fax (864) 797-7155

Enumeration date Apr 7, 2015

Last updated in NPPES Oct 24, 2023

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 87499 (SC) 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

What is the NPI number for Charles Opalak?

The National Provider Identifier (NPI) for Charles Opalak is 1821484882, a Type 1 (individual) record in the CMS NPPES registry.

Where does Charles Opalak practice?

The practice location on file with NPPES is in Greenville, SC. 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 2023-10-24.