Garrett Greenan, MD
NPI 1225579584 · Gastroenterology Physician · Davidson, NC
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Garrett Greenan, MD is a Gastroenterology Physician provider in Davidson, NC (NPI 1225579584).
Provider details
- NPI number
- 1225579584
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2020011722 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
3,631 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Chronic Care Management Services for Two Or More Chronic Conditions, Additional 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99439 | 1,562 | $45 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 883 | $59 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 332 | $119 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 125 | $141 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 113 | $76 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 294 | 131 |
| Pantoprazole Sodium | 181 | 70 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 148 | 130 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 138 | 134 |
| Linaclotidebrand: Linzess | 92 | 36 |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine | 47 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,498 across 187 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 300 Billingsley Rd Ste 200Charlotte, NC 28211-1180Phone: (704) 372-7974Fax: (704) 372-8201
- 8210 University Exec Park Dr Ste 100Charlotte, NC 28262-1329Phone: (704) 372-7974Fax: (704) 372-8201
Registry dates
- Enumerated
- 2017-03-20
- Last updated
- 2026-01-13
- Certified
- 2026-01-13
Frequently asked questions
- What is Garrett Greenan's NPI number?
- Garrett Greenan's National Provider Identifier (NPI) is 1225579584, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Garrett Greenan's specialty?
- Garrett Greenan is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Garrett Greenan located?
- Garrett Greenan's practice location on file with NPPES is 705 Griffith St Ste 205, Davidson, NC 28036-9307.
- What is Garrett Greenan's phone number?
- The practice phone number listed in the NPPES registry for Garrett Greenan is (704) 372-7974.
- Does Garrett Greenan accept Medicare?
- Garrett Greenan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Garrett Greenan's NPI active?
- Yes — Garrett Greenan's NPI (1225579584) is active in the NPPES registry as of the last update on 2026-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.