Dr. Catherine C. Gerrish, MD
- Medicare services, 2018
- 1,803
- Part D claims, 2023
- 12
- Industry payments
- $316
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 506 1st Ave Se, Watertown, SD 57201-4402
- Practice phone
- Call (605) 886-8482
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Nrs Arizona
Primary care practice · Watertown, South Dakota
Find Dr. Gerrish's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Catherine C. Gerrish is an internist in Watertown, South Dakota
Dr. Gerrish practices at Nrs Arizona in Watertown, South Dakota.
Dr. Gerrish's NPI, 1770541807, was assigned on May 1, 2006. Dr. Gerrish holds South Dakota license 1394.
- NPI
- 1770541807NPI Registry (opens in a new tab)
- NPI enumeration date
- May 1, 2006
- NPI status
- Active
- Practice phone
- (605) 886-8482
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Catherine C. Gerrish practices at Nrs Arizona in Watertown, South Dakota
Dr. Gerrish's primary practice is Nrs Arizona, at 506 1st Ave Se, Watertown, SD 57201-4402. The practice phone is (605) 886-8482.
- Nrs Arizona506 1st Ave Se, Watertown, SD 57201-4402Phone(605) 886-8482
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Catherine C. Gerrish is affiliated with 1 site of care and 1 medical group
Dr. Gerrish's primary practice is Nrs Arizona in Watertown, South Dakota. Dmand AI also links Dr. Gerrish to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Catherine C. Gerrish's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gerrish practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Nrs Arizona | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Catherine C. Gerrish is one of 267 internists in South Dakota
Internal medicine is Dr. Gerrish's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gerrish is licensed in South Dakota.
Specialties and state licenses
- Internal medicine, South DakotaPrimary
Internists near Dr. Gerrish
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Catherine C. Gerrish billed Medicare for 1,803 services in 2018
CMS data shows 1,803 Medicare services from Dr. Gerrish across 31 procedure codes in 2018. Medicare paid $52,595 for them.
Dr. Gerrish's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Lab and pathology
- 2017: 1,9512018: 72663%
- Office and hospital visits
- 2017: 1,3732018: 67051%
- Surgery
- 2017: 5242018: 23056%
- Other services
- 2017: 3932018: 6284%
- Imaging
- 2017: 1292018: 4664%
- Drugs given in the office
- 2017: 1,6432018: 3798%
- Tests and treatments
- 2017: 1712018: 3281%
Where Dr. Gerrish's Medicare services took place, 2018
- In an office1,76998%
- In a facility342%
Dr. Gerrish compared with the South Dakota median for internists, 2018
- Dr. Gerrish
- South Dakota median
- Medicare services
- 1,803vs 5423.3 times
- Part D claims
- 12vs 12490% below
Medians across 262 internists in South Dakota with Dmand AI profiles that report each measure.
Dr. Gerrish's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Gerrish?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gerrish and other internists in South Dakota.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Catherine C. Gerrish's patients have a median age of 79
Across all payers, Dmand AI patient panel data puts Dr. Gerrish's median patient age at 79, with 78% women.
Dr. Gerrish's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women78%
- Men22%
Source: Dmand AI Patient Panel Data
Dr. Catherine C. Gerrish wrote 12 Medicare Part D claims in 2023
In 2023, Dr. Gerrish wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $85 in total drug cost. In 2022, CMS named 12 claims across 1 drug.
Dr. Gerrish's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 122023: 12No change
Drugs named by CMS: 1 in 2023, 1 in 2022.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Catherine C. Gerrish received $316 in industry payments from 2016 to 2018
CMS Open Payments shows 27 general payments to Dr. Gerrish from 9 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $160.
General payments to Dr. Gerrish by program year, 2016 to 2018
Companies that paid Dr. Gerrish the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Catherine C. Gerrish's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Catherine C. Gerrish
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Catherine C. Gerrish's NPI number?
Dr. Catherine C. Gerrish's NPI number is 1770541807. It was assigned on May 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Catherine C. Gerrish?
Dr. Catherine C. Gerrish is an internist in Watertown, South Dakota. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Catherine C. Gerrish practice?
Dr. Gerrish practices at 506 1st Ave Se, Watertown, SD 57201-4402. Dr. Gerrish's primary practice is Nrs Arizona in Watertown, South Dakota. Dmand AI also links Dr. Gerrish to 1 medical group.
What is Dr. Catherine C. Gerrish's office phone number?
The practice phone on file for Dr. Gerrish is (605) 886-8482.
What is Dr. Catherine C. Gerrish's medical license number?
Dr. Gerrish holds South Dakota license 1394.
Does Dr. Catherine C. Gerrish accept Medicare?
Yes. CMS data shows Dr. Gerrish billed Medicare for 1,803 services in 2018.
What services does Dr. Catherine C. Gerrish bill to Medicare?
In 2018, Dr. Gerrish's most billed Medicare services were care management and other visits (99490), surgery: heart and blood vessels (36415) and office visit, established patient (99215).
What drugs does Dr. Catherine C. Gerrish prescribe most?
In 2023 Medicare Part D data, Dr. Gerrish's most prescribed drugs by claims were Furosemide.
Has Dr. Catherine C. Gerrish received payments from drug or device companies?
CMS Open Payments shows $316 in general payments to Dr. Gerrish from 9 companies from 2016 to 2018. The largest total came from Allergan Inc.
How long has Dr. Catherine C. Gerrish been practicing?
Dr. Gerrish's NPI was assigned in 2006.
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