Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. John Douglas Clark, MD

Individual provider Pulmonary Disease Physician · NPI 1194798595

Dr. John Douglas Clark, MD is registered under Pulmonary Disease in Spartanburg, South Carolina. Graduated from University of Tennessee, Hsc, College of Medicine in 1985, 41 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in South Carolina.

Years since qualifying
41
Trained at
University of Tennessee, Hsc, College of Medicine
Licensed in
SC
In the registry since
2006
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2030 N Church Pl
Spartanburg, SC 29303 Not confirmed with CMS for 10 years — call before visiting
Phone: (864) 582-6858
Fax: (864) 585-0999
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence 19596 (SC)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 19596 (SC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 19596 (SC)
Sleep Medicine (Internal Medicine) Physician Taxonomy 207RS0012X · Licence 19596 (SC)

Record details

NPI number1194798595
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 8, 2006
Last updated in NPPESDecember 28, 2015

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPULMONARY DISEASE
Also practisesCRITICAL CARE (INTENSIVISTS), SLEEP MEDICINE
Medical schoolUNIVERSITY OF TENNESSEE, HSC, COLLEGE OF MEDICINE
Graduated 1985 (41 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients615
Services billed 2,322 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $3,177 140 payments · a meal or drink at a meeting or visit, not a fee
Education $86 2 payments · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Other providers in Spartanburg