Darwin G. Gramstad, CRNA
- Medicare patients, 2024
- 730
- Industry payments
- $17
- Affiliated sites
- 1
- Medical groups
- 2
- State license
- 1
- Practice address
- 6601 S Minnesota Ave, Ste 100, Sioux Falls, SD 57108
- Practice phone
- Call (605) 336-6294
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ophthalmology LTD Eye Surgery Center
Surgery Center - Medicare-Certified · Sioux Falls, South Dakota
Find Darwin Gramstad'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.
Darwin G. Gramstad is a nurse anesthetist in Sioux Falls, South Dakota
Darwin Gramstad practices at Ophthalmology LTD Eye Surgery Center in Sioux Falls, South Dakota.
Darwin Gramstad's NPI, 1063401081, was assigned on October 21, 2005. Darwin Gramstad holds South Dakota license R024467.
- NPI
- 1063401081NPI Registry (opens in a new tab)
- NPI enumeration date
- October 21, 2005
- NPI status
- Active
- Practice phone
- (605) 336-6294
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Darwin G. Gramstad practices at Ophthalmology LTD Eye Surgery Center in Sioux Falls, South Dakota
Darwin Gramstad's primary practice is Ophthalmology LTD Eye Surgery Center, at 6601 S Minnesota Ave, Ste 100, Sioux Falls, SD 57108. The practice phone is (605) 336-6294.
- Ophthalmology LTD Eye Surgery Center6601 S Minnesota Ave, Ste 100, Sioux Falls, SD 57108Phone(605) 336-6294
Source: Dmand AI Affiliation Data
Darwin G. Gramstad is affiliated with 1 site of care and 2 medical groups
Darwin Gramstad's primary practice is Ophthalmology LTD Eye Surgery Center in Sioux Falls, South Dakota. The medical group on file is Ophthalmology LTD Eye Surgery Center. Dmand AI also links Darwin Gramstad to 1 more medical group, named with a free account. Darwin Gramstad's employer is on file too: a surgery center (asc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Darwin G. Gramstad's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Darwin Gramstad practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ophthalmology LTD Eye Surgery Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Darwin G. Gramstad is one of 439 nurse anesthetists in South Dakota
Nurse anesthetist, certified registered is Darwin Gramstad's primary specialty in the NPI Registry, under taxonomy code 367500000X. Darwin Gramstad is licensed in South Dakota.
Specialties and state licenses
- Certified registered nurse anesthetist, South DakotaPrimary
Nurse anesthetists near Darwin Gramstad
Counts of nurse anesthetists 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
Darwin G. Gramstad treated 730 Medicare patients in 2024, average age 74
CMS counts 730 Medicare patients who saw Darwin Gramstad in 2024. The largest group is 65 to 74, with 385 patients. 74% of them have high cholesterol, and 71% have high blood pressure. 5% are also on Medicaid. Their average risk score is 0.99, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Darwin Gramstad's median patient age at 71, with 63% women.
Darwin Gramstad's Medicare patients by age, 2024
Darwin Gramstad's Medicare patients by sex, 2024
- Women41457%
- Men31643%
Chronic conditions among Darwin Gramstad's Medicare patients, 2024
- High cholesterol74%
- High blood pressure71%
- Arthritis37%
- Diabetes28%
- Ischemic heart disease22%
- Chronic kidney disease20%
- Mood disorders20%
- Anxiety18%
Share of Medicare patients with each condition. A patient can have several.
Darwin Gramstad's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women63%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Darwin G. Gramstad received $17 in industry payments in 2025
CMS Open Payments shows 1 general payment to Darwin Gramstad from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $17.
Companies that paid Darwin Gramstad the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Darwin G. Gramstad'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 Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (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 Darwin G. Gramstad
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What is Darwin G. Gramstad's NPI number?
Darwin G. Gramstad's NPI number is 1063401081. It was assigned on October 21, 2005, and it is active in the NPI Registry.
What does Darwin G. Gramstad specialize in?
Darwin G. Gramstad is a nurse anesthetist in Sioux Falls, South Dakota. The primary specialty in the NPI Registry is Certified Registered Nurse Anesthetist (taxonomy code 367500000X).
Where does Darwin G. Gramstad practice?
Darwin Gramstad practices at 6601 S Minnesota Ave, Ste 100, Sioux Falls, SD 57108. Darwin Gramstad's primary practice is Ophthalmology LTD Eye Surgery Center in Sioux Falls, South Dakota. Dmand AI also links Darwin Gramstad to 1 medical group.
What is Darwin G. Gramstad's office phone number?
The practice phone on file for Darwin Gramstad is (605) 336-6294.
What is Darwin G. Gramstad's medical license number?
Darwin Gramstad holds South Dakota license R024467.
What medical group is Darwin G. Gramstad part of?
Darwin Gramstad is linked to Ophthalmology LTD Eye Surgery Center. Dmand AI links Darwin Gramstad to 1 more medical group.
How many Medicare patients does Darwin G. Gramstad see?
CMS counts 730 Medicare patients who saw Darwin Gramstad in 2024, with an average age of 74.
Has Darwin G. Gramstad received payments from drug or device companies?
CMS Open Payments shows $17 in general payments to Darwin Gramstad from 1 company from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Darwin G. Gramstad been practicing?
Darwin Gramstad's NPI was assigned in 2005.
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