Doctor profile · Federal record
Dr. Gregory Gerrish, M.D.
Surgery Physician (CMS: General Surgery) · Student in an Organized Health Care Education/Training Program · Watertown, SD
- NPI 1992097703
- Accepts Medicare
- MIPS 97.8 / 100 · 2023
- 15 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
401 9Th Ave. Nw, Prairie Lakes Hospital
Watertown, SD 572011623
(605) 882-7000 - Mailing address
-
Po Box 1210
Watertown, SD 572016210
Credentials & registration
- NPI registered
- May 2011 — 15 yrs on file
- Profile last updated
- August 17, 2016
- Year of graduation
- 2011 — 15 yrs since
- Specialty taxonomy
- 208600000X — NUCC code
- State license (1)
- South Dakota #10080
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1992097703. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
396
Distinct HCPCS
10
Medicare allowed
$52,406
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 56 | 52 | $77 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 50 | 50 | $213 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 40 | 40 | $78 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 35 | 35 | $171 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 33 | 28 | $63 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 33 | 32 | $169 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 30 | 30 | $79 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 27 | 27 | $152 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 21 | 15 | $87 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 16 | 15 | $93 |
In context: peer comparison
Among 4 peers in Watertown Surgery Physician, average services per provider: 31. This provider delivers 13× the peer median.Open Payments
Industry payments received
All-time total
$61
Transactions
3
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Organogenesis INC. | 1 | $26.10 | |
| Davol INC. | 1 | $19.64 | |
| Phathom Pharmaceuticals, INC. | 1 | $15.49 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
260
Patients
201
Total drug cost
$4,231
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 131 | 124 | $2,344 |
| Omeprazole | Generic | 61 | 25 | $1,186 |
| Pantoprazole Sodium | Generic | 29 | 13 | $559 |
| Tramadol Hcl | Generic | 28 | 28 | $58 |
| Celecoxib | Generic | 11 | 11 | $85 |
Hospital affiliations
Frequently asked questions
What is Dr. Gregory Gerrish's medical specialty?
Dr. Gregory Gerrish practices Surgery Physician in Watertown, SD.
Where does Dr. Gregory Gerrish practice?
Dr. Gregory Gerrish practices at 401 9Th Ave. Nw, Watertown, SD 572011623. Office phone: 6058827000.
What is Dr. Gregory Gerrish's NPI?
Dr. Gregory Gerrish's National Provider Identifier (NPI) is 1992097703, issued by NPPES.
Does Dr. Gregory Gerrish accept Medicare assignment?
Yes. Dr. Gregory Gerrish accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Gerrish commonly perform?
Top Medicare-reported procedures in 2023: Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); New patient office or other outpatient visit (HCPCS 99203). Source: CMS Medicare Physician & Other Practitioners file.