Robert J. Ishak, M.D.
Internal Medicine Physician · Charleston, SC
Robert J. Ishak, M.D. is an internal medicine physician with a practice address in Charleston, South Carolina, and NPI 1295727790, issued on Aug 19, 2005. Check the license (South Carolina 40223, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Robert J. Ishak
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 40223 SC
D0068235 MD
25MA07022100 NJ
MF070336L PA
Self-reported in NPPES; status is on the state search - Practice location
- 171 Ashley Ave, Charleston, SC 29425
- Phone
- (843) 792-1414
- Enumerated
- Aug 19, 2005
- Record last updated
- Apr 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210503000745); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1996
- 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 171 Ashley Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert J. Ishak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 40223Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% more Medicare Part D claims than the average internal medicine physician in 2024
6,236 Medicare Part D claims for 774 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 58 claims were for opioids.
Most prescribed
- Atorvastatin Calcium467 claims
- Rosuvastatin Calcium430 claims
- Amlodipine Besylate304 claims
- Losartan Potassium228 claims
- Levothyroxine Sodium185 claims
- Lisinopril154 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).
Robert J. Ishak among 1,881 internal medicine physician records in South Carolina
Robert J. Ishak, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1996 · median 2006 among the 1,119 with a school on file
- Record last updated2021 · 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).
427 internal medicine physician records list a practice address in Charleston
They are 427 of the 10,840 NPPES records with a practice address in Charleston, and 1,881 internal medicine physician records in South Carolina.
All 1,881 in South Carolina → Every provider in Charleston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sujeev Bains, MDCharleston, SC 294251609889989
- Elisha Brownfield, MDCharleston, SC 294251639287683
- Ernest Clyburn, MDCharleston, SC 294251235247271
- Kimberly Davis, MDCharleston, SC 294251366550311
- John Feussner, MDCharleston, SC 294251689782534
- Jennifer Goldstein, MDCharleston, SC 294251164472593
- Brad Keith, MDCharleston, SC 294251578671442
- Cheryl Lynch, MDCharleston, SC 294251780658641
Common questions
What is Robert J. Ishak, M.D.'s NPI number?
Robert J. Ishak, M.D.'s National Provider Identifier (NPI) is 1295727790, issued on Aug 19, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert J. Ishak, M.D. located?
The NPPES record lists a practice address at 171 Ashley Ave, Charleston, SC, 29425. Phone: (843) 792-1414. Providers update this record themselves, so call before visiting.
How can I verify Robert J. Ishak, M.D.'s license?
NPPES lists South Carolina license number 40223, 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 Robert J. Ishak, M.D. prescribe under Medicare Part D?
In 2024, Robert J. Ishak, M.D. had 6,236 Medicare Part D claims for 774 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.