Doctor profile · Federal record
Dr. Garrett Greenan, MD
Gastroenterology Physician (CMS: Internal Medicine) · Gastroenterology Physician · Davidson, NC
- NPI 1225579584
- Accepts Medicare
- MIPS 91.1 / 100 · 2023
- 9 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
705 Griffith St Ste 205
Davidson, NC 280369307
(704) 372-7974
fax (704) 372-8201 - Additional location
-
300 Billingsley RD Ste 200
Charlotte, NC 282111180 - Additional location
-
8210 University Exec Park Dr Ste 100
Charlotte, NC 282621329 - Mailing address
-
3426 Toringdon Way Ste 108
Charlotte, NC 282773497
Credentials & registration
- NPI registered
- March 2017 — 9 yrs on file
- Profile last updated
- January 13, 2026
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State licenses (2)
- North Carolina #2023-01019 · Missouri #2020011722
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1225579584. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
962
Distinct HCPCS
10
Medicare allowed
$70,089
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99439 |
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 | 392 | 83 | $45 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 215 | 84 | $59 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 99 | 81 | $121 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 52 | 52 | $155 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 37 | 23 | $75 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 33 | 32 | $128 | |
99457 |
Management using the results of remote vital sign monitoring per calendar month, first 20 minutes | 33 | 15 | $46 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 30 | 30 | $79 | |
99454 |
Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days | 24 | 13 | $46 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 19 | 19 | $124 |
In context: peer comparison
Among 1 peers in Davidson Gastroenterology Physician, average services per provider: 80. This provider delivers 12× the peer median.Open Payments
Industry payments received
All-time total
$3,498
Transactions
178
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 57 | $979.84 | |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | 24 | $427.66 | |
| Genzyme Corporation | 14 | $311.10 | |
| Vivus LLC | 17 | $281.07 | |
| Janssen Biotech, INC. | 15 | $258.20 | |
| Regeneron Healthcare Solutions, INC. | 11 | $245.65 | |
| 3-D Matrix, INC. | 1 | $144.10 | |
| Takeda Pharmaceuticals U.S.A., INC. | 8 | $139.12 | |
| Pfizer INC. | 8 | $136.60 | |
| Lilly USA, LLC | 6 | $117.39 | |
| Madrigal Pharmaceuticals | 3 | $67.65 | |
| Qol Medical, LLC | 4 | $65.47 | |
| Ironwood Pharmaceuticals, INC | 4 | $65.33 | |
| Organon LLC | 4 | $49.76 | |
| Celgene Corporation | 2 | $38.02 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
138
Patients
111
Total drug cost
$21,208
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 44 | 37 | $1,021 |
| Pantoprazole Sodium | Generic | 26 | 21 | $654 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 18 | 18 | $3,240 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 18 | 17 | $1,363 |
| Sutab (Sod Sulf/Pot Chloride/Mag Sulf) | Brand | 18 | 18 | $3,091 |
| Linzess (Linaclotide) | Brand | 14 | 0 | $11,839 |
Hospital affiliations
Frequently asked questions
What is Dr. Garrett Greenan's medical specialty?
Dr. Garrett Greenan practices Gastroenterology Physician in Davidson, NC.
Where does Dr. Garrett Greenan practice?
Dr. Garrett Greenan practices at 705 Griffith St Ste 205, Davidson, NC 280369307. Office phone: 7043727974.
What is Dr. Garrett Greenan's NPI?
Dr. Garrett Greenan's National Provider Identifier (NPI) is 1225579584, issued by NPPES.
Does Dr. Garrett Greenan accept Medicare assignment?
Yes. Dr. Garrett Greenan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Garrett Greenan commonly perform?
Top Medicare-reported procedures in 2023: 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 (HCPCS 99439); Chronic care management services (HCPCS 99490); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.