Catherine Isaac, M.D.
Internal Medicine Physician · Research Triangle Park, NC
Catherine Isaac, M.D. is an internal medicine physician with a practice address in Research Triangle Park, North Carolina, and NPI 1376700070, issued on May 20, 2008. Check the license (North Carolina 201800340, as entered in NPPES) on the North Carolina Medical Board; the Medicare figures below come from public CMS files.
- Name
- Catherine Isaac
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 201800340 NC
Self-reported in NPPES; status is on the state search - Practice location
- 600 Park Offices Dr Ste 140, Research Triangle Park, NC 27709
- Phone
- (919) 425-5864
- Enumerated
- May 20, 2008
- Record last updated
- Apr 19, 2024
- Entity
- Type 1 · individual
Also registered at 600 Park Offices Dr Ste 140
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hugh Colvin, MDEmergency Medicine Physician1528048295
Verify Catherine Isaac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Carolina Medical Board
Search for license 201800340Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,916 Medicare Part D claims for 295 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 16 claims were for opioids.
Most prescribed
- Atorvastatin Calcium223 claims
- Amlodipine Besylate107 claims
- Losartan Potassium103 claims
- Levothyroxine Sodium83 claims
- Lisinopril76 claims
- Rosuvastatin Calcium66 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.
2 internal medicine physician records list a practice address in Research Triangle Park
They are 2 of the 19 NPPES records with a practice address in Research Triangle Park, and 4,056 internal medicine physician records in North Carolina.
All 2 in Research Triangle Park → All 4,056 in North Carolina → Every provider in Research Triangle Park →
Other internal medicine physician records in North Carolina
- Ana Abaroa-Salvatierra, M.D.Pollocksville, NC1598101750
- Naa Deisa Abbey, MDShelby, NC1467899294
- Stephen Abbott, D.O.Sanford, NC1013216282
- Rami Abdo, MDDurham, NC1184693160
- Farhath Abdul Kareem, MDCary, NC1679687347
- Firas Abdulmajeed, M.D.Winston Salem, NC1427358043
- Erlinda Abella, MDSalisbury, NC1649251505
- Bisrat AberaFayetteville, NC1871453886
- David Abernathy, M. D.Morganton, NC1265497366
- Maroun Aboutayeh, D.O.Asheville, NC1447757992
Common questions
What is Catherine Isaac, M.D.'s NPI number?
Catherine Isaac, M.D.'s National Provider Identifier (NPI) is 1376700070, issued on May 20, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Isaac, M.D. located?
The NPPES record lists a practice address at 600 Park Offices Dr Ste 140, Research Triangle Park, NC, 27709. Phone: (919) 425-5864. Providers update this record themselves, so call before visiting.
How can I verify Catherine Isaac, M.D.'s license?
NPPES lists North Carolina license number 201800340, as entered by the provider. Search the North Carolina Medical Board at https://portal.ncmedboard.org/verification/search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Catherine Isaac, M.D. prescribe under Medicare Part D?
In 2024, Catherine Isaac, M.D. had 1,916 Medicare Part D claims for 295 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.