Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. William W Harless, M.D. PHD.

Medical Oncology Physician in Charleston, WV · enumerated 2007.

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

National Provider Identifier

1528100948

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William W Harless

Credential M.D. PHD.

Sex Male

Practice address Charleston, WV, 25304

Phone (304) 388-4949

Enumeration date Feb 13, 2007

Last updated in NPPES Jun 8, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 37144 (AL) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License MD23392 (ME) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License MD23392 (ME) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 35C.003724 (OH) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 21423 (WV) Primary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 62961 (CT) Secondary

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 William Harless?

The National Provider Identifier (NPI) for William Harless is 1528100948, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Harless practice?

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

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-08.