Quick answers
- Does Garrett S. Greenan accept Medicare assignment?
- Yes. Medicare's clinician data says Garrett S. Greenan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Garrett S. Greenan see?
- In 2024, CMS data shows 542 Original Medicare patients and 3,702 services for Garrett S. Greenan. This counts Original Medicare only and measures volume, not quality.
- What is Garrett S. Greenan's NPI number?
- 1225579584. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Garrett S. Greenan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 542 |
|---|---|
| Services billed to Medicare | 3,702 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)1,562 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)883 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)332 services
- Biopsy of large bowel using a flexible endoscope (45380)125 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)113 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Diabetes33%
- Chronic kidney disease28%
- Ischemic heart disease27%
Hospitals where Garrett S. Greenan works
Medicare's Facility Affiliation Data lists Garrett S. Greenan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Atrium Health University CityCharlotte, NC · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 340166
- Carolinas Medical Center-NortheastConcord, NC · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 340001
- Carolinas Medical Center/Behavioral HealthCharlotte, NC · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 340113
- Novant Health Huntersville Medical CenterHuntersville, NC · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 340183
- Novant Health Presbyterian Medical CenterCharlotte, NC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 340053
Practice locations
Addresses where Garrett S. Greenan is enrolled with Medicare (CMS data updated October 2, 2026).
- 705 Griffith St, Suite 205Davidson, NC 28036 (704) 799‑2750
- 8210 University Exec Park Dr, Suite 100Charlotte, NC 28262 (704) 547‑8818
Group practices
Medicare enrollment lists Garrett S. Greenan as a member of this group (CMS data updated October 2, 2026).
- Carolina Digestive Health Associates PA45 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in North Carolina
Clinicians with the same Medicare primary specialty in North Carolina — not a recommendation.
Other clinicians in Carolina Digestive Health Associates PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Maryland School Of Medicine |
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225579584 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians