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

Dr. John Douglas Clark, MD

Critical Care Medicine (Internal Medicine) Physician in Spartanburg, SC · enumerated 2006.

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

National Provider Identifier

1194798595

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Registry record

Entity type Individual (Type 1)

Name Dr. John Douglas Clark

Credential MD

Sex Male

Practice address Spartanburg, SC, 29303

Phone (864) 582-6858

Fax (864) 585-0999

Enumeration date Feb 8, 2006

Last updated in NPPES Dec 28, 2015

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

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 19596 (SC) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 19596 (SC) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 19596 (SC) Primary

207RS0012X Sleep Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 19596 (SC) Secondary

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
T36609	Medicaid	SC	-
290011227	Other	-	RAILROAD
290009501	Other	-	RAILROAD
8688	Other	SC	MBPG'S

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

Is NPI 1194798595 active?

Yes, as of the latest NPPES snapshot, NPI 1194798595 is active (record last updated 2015-12-28).

How do I verify John Clark's NPI record?

Cross-check NPI 1194798595 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-12-28.