John K. Corless, MD
Specialist · Charleston, SC
John K. Corless, MD is a specialist with a practice address in Charleston, South Carolina, and NPI 1962408443, issued on Jun 21, 2005. Check the license (South Carolina 8734, as entered in NPPES) with the South Carolina board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John K. Corless
- Credential
- MD
- Primary taxonomy
- Specialist 174400000X
- License number
- 8734 SC
Self-reported in NPPES; status is on the state search - Practice location
- 1962 Charlie Hall Blvd, Charleston, SC 29414
- Phone
- (843) 722-8000
- Enumerated
- Jun 21, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (843) 723-7850
- Medicaid ID
- 87346 SC
- Medicare enrollment
- Enrolled (PECOS I20101130000747); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest specialist records → All 354 in South Carolina → Look up another NPI →
Also registered at 1962 Charlie Hall Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John K. Corless in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich South Carolina board licenses this profession
Search for license 8734Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average specialist in 2024
85 Medicare Part D claims for 72 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims.
Most prescribed
- Gavilyte-G37 claims
- Peg-3350 And Electrolytes21 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
- University Medical Associates OF The Medical University OF South CarolCharleston, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John K. Corless among 354 specialist records in South Carolina
John K. Corless, MD is one of 354 specialist records with a practice address in South Carolina. 27% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 27% of these records are
- In the CMS Doctors and Clinicians fileYes · 16% of these records are
- Graduated1977 · median 1990 among the 57 with a school on file
- Record last updated2026 · 81% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in South Carolina
There are 354 specialist records in South Carolina.
All 354 in South Carolina → Every provider in Charleston → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- William Brener, MDCharleston, SC 294141891791372
- Emma Chambers, OTR/LCharleston, SC 294141699170084
- Robert GulbransonCharleston, SC 294141023440567
- Lloyd HaleCharleston, SC 294141639247497
- Stacy PhillipsCharleston, SC 294141801307483
- James Ravenel, MDCharleston, SC 294141134125628
- Michael Sagatelian, MDCharleston, SC 294141962452367
- Michael SeaboltCharleston, SC 294141528895075
Common questions
What is John K. Corless, MD's NPI number?
John K. Corless, MD's National Provider Identifier (NPI) is 1962408443, issued on Jun 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John K. Corless, MD located?
The NPPES record lists a practice address at 1962 Charlie Hall Blvd, Charleston, SC, 29414. Phone: (843) 722-8000. Providers update this record themselves, so call before visiting.
How can I verify John K. Corless, MD's license?
NPPES lists South Carolina license number 8734, as entered by the provider. Search the South Carolina board that licenses this profession; the NPPES record confirms identity only.
How much does John K. Corless, MD prescribe under Medicare Part D?
In 2024, John K. Corless, MD had 85 Medicare Part D claims for 72 beneficiaries; the average among specialist prescribers was 1,380. 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.