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

Mr. Nathaniel Christian Oncken, DC

Individual provider Chiropractor · NPI 1447211214

Mr. Nathaniel Christian Oncken, DC is registered under Chiropractic in Greenwood, South Carolina. Graduated from Sherman College of Straight Chiropractic in 2005, 21 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in South Carolina.

Years since qualifying
21
Trained at
Sherman College of Straight Chiropractic
Licensed in
SC
In the registry since
2006
What do these letters mean?
DC — Doctor of Chiropractic
A licensed chiropractor.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

423 Calhoun Ave B
Greenwood, SC 29649-2015 Not confirmed with CMS for 15 years — call before visiting
Phone: (864) 223-2224
Fax: (864) 223-2225
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence 3107 (SC)

Record details

NPI number1447211214
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorYes
NPI enumeratedMarch 31, 2006
Last updated in NPPESFebruary 23, 2011

Medicare enrollment

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

Medicare specialtyCHIROPRACTIC
Medical schoolSHERMAN COLLEGE OF STRAIGHT CHIROPRACTIC
Graduated 2005 (21 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 patients130
Services billed 1,087 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

Other providers in Greenwood