Mark Gruchacz, M.D.
NPI 1659364115 · Internal Medicine Physician · Raleigh, NC
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Gruchacz, M.D. is a Internal Medicine Physician provider in Raleigh, NC (NPI 1659364115).
Provider details
- NPI number
- 1659364115
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 9700258 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
886 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 430 | $111 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 234 | $74 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 155 | $106 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 67 | $46 |
Typical Medicare-allowed amounts for these services range $46–$111 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 33 | 15 |
| Prednisone | 24 | 24 |
| Cefdinir | 22 | 22 |
| Atorvastatin Calcium | 21 | 14 |
| Apixabanbrand: Eliquis | 21 | — |
| Oxycodone Hcl | 20 | 20 |
| Levothyroxine Sodium | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-30
- Last updated
- 2021-02-25
- Certified
- 2021-02-25
Frequently asked questions
- What is Mark Gruchacz's NPI number?
- Mark Gruchacz's National Provider Identifier (NPI) is 1659364115, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Gruchacz's specialty?
- Mark Gruchacz is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Gruchacz located?
- Mark Gruchacz's practice location on file with NPPES is 3000 New Bern Ave, Raleigh, NC 27610-1231.
- What is Mark Gruchacz's phone number?
- The practice phone number listed in the NPPES registry for Mark Gruchacz is (919) 350-8000.
- Does Mark Gruchacz accept Medicare?
- Mark Gruchacz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Gruchacz's NPI active?
- Yes — Mark Gruchacz's NPI (1659364115) is active in the NPPES registry as of the last update on 2021-02-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.