Active NPI 1992097703 Individual Practitioner Male Practitioner

Dr. Gregory Mark Gerrish , MD

Surgery • Watertown, SD

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Gregory Gerrish, MD is a certified Surgery practicing in Watertown, SD. With approximately 15 years of clinical experience since graduating from Sanford School Of Medicine Of University Of South Dakota in 2011, Dr. Gerrish delivers high-quality medical care to the local community at 401 9TH AVE. NW.

Dr. Gerrish is affiliated with Prairie Lakes Health Care System Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient outpatient office visit, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope, removal of polyps or growths of large bowel using an endoscope with mechanical snare. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

401 9th Ave. Nw
Prairie Lakes Hospital

Watertown, SD 572011623

Telephone 6058827000

Associated Practice Facility / Clinic

🏢 Watertown Pathology Pc Facility NPI 1114966892

Medicare Profile & Education

Medical School

Sanford School Of Medicine Of University Of South Dakota

Graduation Year

2011

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery in Watertown, SD

Established Specialist (10-20 Yrs)

Practitioner Clinical Experience

15 Yrs -4.0 yrs vs City Avg

City Avg: 19.0 Yrs

State Avg: 25.8 Yrs

Regional Practice Density

10 Specialists

Practicing in Watertown, SD (126 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

83.5% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Gerrish (15 Years) 15 Yrs

Watertown Specialty Average (19.0 Years) 19.0 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	67	58	$155.00	$62.08
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	62	60	$889.00	$81.48
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	55	54	$1634.00	$205.65
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	45	45	$240.00	$76.57
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	29	29	$853.00	$80.10
45378 Diagnostic exam of large bowel using a flexible endoscope	23	23	$1029.00	$160.49
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	22	22	$1029.00	$168.93
99221 Initial hospital inpatient care per day, typically 30 minutes	20	20	$278.00	$76.68
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	19	17	$227.00	$91.51
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	18	18	$1029.00	$164.24
45380 Biopsy of large bowel using an endoscope	18	18	$1282.00	$147.09
43249 Balloon dilation of esophagus using an endoscope	15	14	$855.00	$117.94
45388 Destruction of polyp or growth of large bowel using a flexible endoscope	14	13	$1709.00	$247.93
47562 Removal of gallbladder using an endoscope	13	13	$2107.00	$596.67
36561 Insertion of central venous catheter and implanted device for infusion beneath the skin, patient 5 years or older	12	12	$2309.00	$295.54

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	56	52	$882.50	$76.68
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	50	50	$1621.52	$212.69
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	40	40	$237.03	$78.19
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	35	35	$1017.86	$171.44
99213 Established patient office or other outpatient visit, typically 15 minutes	33	28	$153.18	$62.96
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	33	32	$1019.00	$168.71
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	30	30	$843.83	$79.25
45380 Biopsy of large bowel using an endoscope	27	27	$1271.04	$151.79
99213 Established patient office or other outpatient visit, typically 15 minutes	21	15	$281.29	$86.79
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	16	15	$224.38	$93.11
43249 Balloon dilation of esophagus using an endoscope	15	11	$846.67	$133.92
45378 Diagnostic exam of large bowel using a flexible endoscope	15	15	$1019.00	$146.21
45388 Destruction of polyp or growth of large bowel using a flexible endoscope	14	13	$1701.86	$242.58
36561 Insertion of central venous catheter and implanted device for infusion beneath the skin, patient 5 years or older	11	11	$2284.64	$301.66

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	51	51	$863.00	$99.20
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	35	35	$1586.00	$228.48
99213 Established patient office or other outpatient visit, typically 15 minutes	30	27	$194.00	$75.17
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	30	30	$999.00	$173.17
45380 Biopsy of large bowel using an endoscope	25	25	$1245.00	$149.16
99213 Established patient office or other outpatient visit, typically 15 minutes	24	19	$150.00	$64.92
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	24	24	$283.00	$90.86
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	23	23	$999.00	$168.34
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	18	17	$828.00	$81.61
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	18	18	$233.00	$80.42
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	17	11	$163.00	$68.48
43249 Balloon dilation of esophagus using an endoscope	16	13	$830.00	$127.60
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	14	12	$220.00	$95.82
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	12	11	$282.00	$141.85
43281 Repair of hernia of muscle at esophagus and stomach using an endoscope	12	12	$5148.00	$727.02

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	58	57	$863.00	$85.62
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	54	54	$227.00	$81.02
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	35	35	$1586.00	$246.50
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	33	31	$220.09	$97.30
99213 Established patient office or other outpatient visit, typically 15 minutes	32	26	$149.47	$65.76
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	29	29	$828.00	$84.05
45378 Diagnostic exam of large bowel using a flexible endoscope	28	28	$999.00	$169.70
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	28	28	$999.00	$174.71
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	24	19	$159.75	$69.61
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	23	23	$999.00	$169.62
45380 Biopsy of large bowel using an endoscope	20	20	$1245.00	$171.92
99213 Established patient office or other outpatient visit, typically 15 minutes	18	16	$267.33	$89.09
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	16	14	$277.19	$143.16
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	15	15	$376.00	$105.53
99202 New patient office or other outpatient visit, typically 20 minutes	15	15	$150.80	$47.85
43281 Repair of hernia of muscle at esophagus and stomach using an endoscope	14	14	$5148.00	$663.61
47562 Removal of gallbladder using an endoscope	12	12	$2046.00	$604.55
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	12	12	$370.75	$128.28
91035 Monitoring and recording of esophageal function through a capsule attached to the esophagus wall	12	12	$220.50	$80.57
36561 Insertion of central venous catheter and implanted device for infusion beneath the skin, patient 5 years or older	11	11	$2242.00	$319.86
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$299.64	$132.24

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	46	42	$863.00	$98.97
99213 Established patient office or other outpatient visit, typically 15 minutes	33	28	$144.00	$50.88
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	27	20	$157.00	$71.78
99213 Established patient office or other outpatient visit, typically 15 minutes	19	19	$257.63	$73.00
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	18	18	$1586.00	$217.77
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	17	13	$97.00	$25.35
43281 Repair of hernia of muscle at esophagus and stomach using an endoscope	17	17	$5148.00	$975.83
99202 New patient office or other outpatient visit, typically 20 minutes	16	16	$148.00	$49.73
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	15	15	$828.00	$85.62
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$292.00	$127.70
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	12	12	$999.00	$184.15
99201 New patient office or other outpatient visit, typically 10 minutes	12	12	$189.00	$45.95
91010 Study of esophagus to assess movement	12	12	$268.00	$67.11
45378 Diagnostic exam of large bowel using a flexible endoscope	12	12	$999.00	$170.37
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$224.00	$74.73
99201 New patient office or other outpatient visit, typically 10 minutes	11	11	$83.00	$26.16
91035 Monitoring and recording of esophageal function through a capsule attached to the esophagus wall	11	11	$207.00	$83.55

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	46	45	$863.00	$98.17
99202 New patient office or other outpatient visit, typically 20 minutes	38	38	$151.16	$49.71
99213 Established patient office or other outpatient visit, typically 15 minutes	37	27	$144.00	$50.29
99231 Follow-up hospital inpatient care per day, typically 15 minutes	27	18	$94.00	$38.64
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	25	25	$1586.00	$242.39
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	20	20	$224.00	$74.33
45378 Diagnostic exam of large bowel using a flexible endoscope	17	17	$999.00	$152.04
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	17	16	$97.00	$23.57
43281 Repair of hernia of muscle at esophagus and stomach using an endoscope	16	16	$5148.00	$1010.08
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	16	14	$157.00	$71.60
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	14	14	$999.00	$178.00
99213 Established patient office or other outpatient visit, typically 15 minutes	14	12	$271.00	$73.76
91035 Monitoring and recording of esophageal function through a capsule attached to the esophagus wall	14	14	$207.00	$83.03
91010 Study of esophagus to assess movement	14	14	$268.00	$66.99
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$292.00	$126.41
99202 New patient office or other outpatient visit, typically 20 minutes	13	13	$268.00	$75.77
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	13	13	$999.00	$184.66
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	13	13	$828.00	$85.02
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	12	12	$368.00	$106.79
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	12	11	$211.00	$77.70
91037 Monitoring and recording of esophageal function through nasal tube with electrode	12	12	$204.00	$50.88

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	28	28	$863.00	$86.35
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	25	25	$1586.00	$216.97
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	23	23	$299.13	$83.96
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	22	16	$122.45	$27.86
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	21	21	$828.00	$100.51
99213 Established patient office or other outpatient visit, typically 15 minutes	19	17	$197.47	$54.51
99202 New patient office or other outpatient visit, typically 20 minutes	17	17	$176.24	$52.74
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	14	14	$234.29	$71.01
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	13	13	$999.00	$168.00
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	12	12	$999.00	$174.59

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99231 Follow-up hospital inpatient care per day, typically 15 minutes	21	12	$94.00	$36.62
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	15	15	$863.00	$105.04
99221 Initial hospital inpatient care per day, typically 30 minutes	15	15	$259.00	$92.95
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	14	14	$265.14	$79.21
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$335.25	$127.75
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	12	12	$1586.00	$228.53
45378 Diagnostic exam of large bowel using a flexible endoscope	12	11	$999.00	$157.23

Medical Specialties & State Licenses

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

State License SD 10080

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Student in an Organized Health Care Education/Training Program

NUCC Taxonomy Code: 390200000X

An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.

Hospital & Practice Group Affiliations

Prairie Lakes Health Care System Inc

450 Eastvold Ave, Ortonville, MN 562781252

Phone: 3208396157

Prairie Lakes Health Care System Inc

1201 Mickelson Dr, Watertown, SD 572017231

Phone: 6058824743

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners

David Feist , PA-C

Physician Assistant - Medical

NPI 1003243437

Physician Assistant (Certified)

Kevin Roark , CRNA

Nurse Anesthetist, Certified Registered

NPI 1023398898

Certified Registered Nurse Anesthetist

Jared Murphy , CRNA

Nurse Anesthetist, Certified Registered

NPI 1033047196

Certified Registered Nurse Anesthetist

Henry Voss , CRNA

Nurse Anesthetist, Certified Registered

NPI 1033148580

Certified Registered Nurse Anesthetist

Vitoria Heier

Occupational Therapist

NPI 1043072044

Kimberely Ertelt , MS OTR, L

Occupational Therapist

NPI 1063651693

MSOTR, L

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active August 17, 2016

NPI status registered as active in NPPES database

📍

Updated Practice Location August 17, 2016

Registered at 401 9TH AVE. NW, PRAIRIE LAKES HOSPITAL, WATERTOWN, SD 572011623 (Tel: 6058827000)

📍

Updated Business Mailing Address August 17, 2016

Registered at PO BOX 1210, WATERTOWN, SD 572016210 (Tel: 6056708594)

👤

Provider Name / Credentials Updated August 17, 2016

Recorded as GREGORY GERRISH, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 17, 2016

Surgery (License #10080 in SD)

🟢

Initial NPI Registration & Enumeration May 12, 2011

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1992097703

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: May 12, 2011

Last Update: August 17, 2016

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 1210

Watertown, SD 572016210

Phone: 6056708594

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

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