Mark John Gruchacz, M.D.
Internal Medicine Physician · Raleigh, NC
Mark John Gruchacz, M.D. is an internal medicine physician with a practice address in Raleigh, North Carolina, and NPI 1659364115, issued on Aug 30, 2005. Check the license (North Carolina 9700258, as entered in NPPES) on the North Carolina Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark John Gruchacz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 9700258 NC
Self-reported in NPPES; status is on the state search - Practice location
- 3000 New Bern Ave, Raleigh, NC 27610
- Phone
- (919) 350-8000
- Enumerated
- Aug 30, 2005
- Record last updated
- Feb 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 891031X NC
- Medicare enrollment
- Enrolled (PECOS I20080904000569); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 1994
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,056 in North Carolina → Look up another NPI →
Also registered at 3000 New Bern Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark John Gruchacz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Carolina Medical Board
Search for license 9700258Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average internal medicine physician in 2024
460 Medicare Part D claims for 171 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. 27 claims were for opioids.
Most prescribed
- Amlodipine Besylate33 claims
- Prednisone24 claims
- Cefdinir22 claims
- Atorvastatin Calcium21 claims
- Eliquis21 claims
- Oxycodone Hcl20 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
- Wakemed Specialists Group LLCCary, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark John Gruchacz among 4,056 internal medicine physician records in North Carolina
Mark John Gruchacz, M.D. is one of 4,056 internal medicine physician records with a practice address in North Carolina. 82% 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, 88% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1994 · median 2004 among the 2,706 with a school on file
- Record last updated2021 · 48% 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 North Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
315 internal medicine physician records list a practice address in Raleigh
They are 315 of the 16,309 NPPES records with a practice address in Raleigh, and 4,056 internal medicine physician records in North Carolina.
All 4,056 in North Carolina → Every provider in Raleigh → Internal Medicine Physician nationwide →
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Common questions
What is Mark John Gruchacz, M.D.'s NPI number?
Mark John Gruchacz, M.D.'s National Provider Identifier (NPI) is 1659364115, issued on Aug 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark John Gruchacz, M.D. located?
The NPPES record lists a practice address at 3000 New Bern Ave, Raleigh, NC, 27610. Phone: (919) 350-8000. Providers update this record themselves, so call before visiting.
How can I verify Mark John Gruchacz, M.D.'s license?
NPPES lists North Carolina license number 9700258, 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 Mark John Gruchacz, M.D. prescribe under Medicare Part D?
In 2024, Mark John Gruchacz, M.D. had 460 Medicare Part D claims for 171 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.