Clay Martin Crosby, M.D.
Internal Medicine Physician · Piedmont, SC
Clay Martin Crosby, M.D. is an internal medicine physician with a practice address in Piedmont, South Carolina, and NPI 1801200522, issued on Jun 20, 2014. Check the license (South Carolina 37082, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Clay Martin Crosby
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 37082 SC
Self-reported in NPPES; status is on the state search - Practice location
- 1115 Wren School RD, Piedmont, SC 29673
- Phone
- (864) 859-0740
- Enumerated
- Jun 20, 2014
- Record last updated
- Mar 23, 2024
- Fax
- (864) 859-9008
- Medicaid ID
- 370823 SC
- Medicare enrollment
- Enrolled (PECOS I20180801002520); accepts Medicare assignment
- Medical or professional school
- Medical University Of South Carolina College Of Medicine, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,881 in South Carolina → Look up another NPI →
Also registered at 1115 Wren School RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Briggs, M.D.Internal Medicine Physician1720309313
- John Goldsmith, M.D.Internal Medicine Physician1275792814
- Quinn Hunt, MDInternal Medicine Physician1588194518
- Gregory Johnson, MDInternal Medicine Physician1205936556
- Abigail Stoker, MDInternal Medicine Physician1407478217
- Janie Thomas, PAPhysician Assistant1467902684
Verify Clay Martin Crosby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 37082Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,709 Medicare Part D claims for 118 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium123 claims
- Amlodipine Besylate89 claims
- Rosuvastatin Calcium81 claims
- Amlodipine-Valsartan71 claims
- Losartan Potassium62 claims
- Levothyroxine Sodium53 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Prisma Health University Medical GroupPiedmont, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clay Martin Crosby among 1,881 internal medicine physician records in South Carolina
Clay Martin Crosby, M.D. is one of 1,881 internal medicine physician records with a practice address in South Carolina. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 59% of them.
- NPI issued2014 · 59% of these records are older, 39% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2014 · median 2006 among the 1,119 with a school on file
- Record last updated2024 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 internal medicine physician records list a practice address in Piedmont
They are 7 of the 139 NPPES records with a practice address in Piedmont, and 1,881 internal medicine physician records in South Carolina.
All 1,881 in South Carolina → Every provider in Piedmont → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Briggs, M.D.Piedmont, SC 296731720309313
- John Goldsmith, M.D.Piedmont, SC 296731275792814
- Quinn Hunt, MDPiedmont, SC 296731588194518
- Gregory Johnson, MDPiedmont, SC 296731205936556
- Abigail Stoker, MDPiedmont, SC 296731407478217
- Horace Walpole, MDPiedmont, SC 296731255307898
- Mark Ayers, MDSeneca, SC 296721669658753
- Helen Johnson-Wall, M.D.Seneca, SC 296721730151481
Common questions
What is Clay Martin Crosby, M.D.'s NPI number?
Clay Martin Crosby, M.D.'s National Provider Identifier (NPI) is 1801200522, issued on Jun 20, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Clay Martin Crosby, M.D. located?
The NPPES record lists a practice address at 1115 Wren School RD, Piedmont, SC, 29673. Phone: (864) 859-0740. Providers update this record themselves, so call before visiting.
How can I verify Clay Martin Crosby, M.D.'s license?
NPPES lists South Carolina license number 37082, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Clay Martin Crosby, M.D. prescribe under Medicare Part D?
In 2024, Clay Martin Crosby, M.D. had 1,709 Medicare Part D claims for 118 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.