Darwin Gramstad, CRNA
NPI 1063401081 · Certified Registered Nurse Anesthetist · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Certified Registered Nurse Anesthetist (crna) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Darwin Gramstad, CRNA is a Certified Registered Nurse Anesthetist provider in Sioux Falls, SD (NPI 1063401081).
Provider details
- NPI number
- 1063401081
- Entity type
- Individual
- Primary specialty
- Certified Registered Nurse AnesthetistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNA
- Sex
- Male
- Sole proprietor
- No
- License
- R024467 (SD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
846 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Anesthesia for Lens Surgery00142 | 519 | $101 |
| Anesthesia for Other Procedure on Eye00140 | 135 | $133 |
| Anesthesia for Retinal Surgery00145 | 112 | $158 |
| Anesthesia for Procedure on Eyelid00103 | 80 | $145 |
Typical Medicare-allowed amounts for these services range $101–$158 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-21
- Last updated
- 2008-01-30
Frequently asked questions
- What is Darwin Gramstad's NPI number?
- Darwin Gramstad's National Provider Identifier (NPI) is 1063401081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Darwin Gramstad's specialty?
- Darwin Gramstad is listed in the NPPES registry with a primary specialty of Certified Registered Nurse Anesthetist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Darwin Gramstad located?
- Darwin Gramstad's practice location on file with NPPES is 6601 S Minnesota Ave, Sioux Falls, SD 57108-2564.
- What is Darwin Gramstad's phone number?
- The practice phone number listed in the NPPES registry for Darwin Gramstad is (605) 336-6294.
- Does Darwin Gramstad accept Medicare?
- Darwin Gramstad is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Darwin Gramstad's NPI active?
- Yes — Darwin Gramstad's NPI (1063401081) is active in the NPPES registry as of the last update on 2008-01-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.