Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Joseph Kolhoff, M.D.

Internal Medicine Physician in Rincon, GA · enumerated 2010 · practices at Effingham Hospital, Inc..

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

National Provider Identifier

1669703278

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Registry record

Entity type Individual (Type 1)

Name Dr. William Joseph Kolhoff

Credential M.D.

Sex Male

Practice address 800 Towne Park Dr Ste 100, Rincon, GA, 31326

Phone (912) 826-0052

Fax (912) 826-4726

Enumeration date Jan 21, 2010

Last updated in NPPES Jul 15, 2015

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 063706 (GA) 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
623869721A	Medicaid	GA	-

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 William Kolhoff?

William Kolhoff is registered in NPPES with the primary taxonomy of Internal Medicine 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.

Other providers at this practice address

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Effingham Hospital, Inc. Rural Health Clinic/Center · Rincon, GA NPI 1962806257

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-15.