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DARWIN G GRAMSTAD CRNA
NPI 1063401081
Nurse Anesthetist, Certified Registered in Sioux Falls, SD

Active since October 21, 2005
6601 S MINNESOTA AVE, SUITE 100, SIOUX FALLS, SD 57108(605) 336-6294(605) 336-2672 Get Directions Write a Review

NPPES record last updated: January 30, 2008. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Darwin G Gramstad Crna NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DARWIN G GRAMSTAD CRNA (NPI 1063401081) is an individual nurse anesthetist, certified registered in Sioux Falls, South Dakota, licensed in South Dakota (R024467) and active in the NPI registry since October 2005.

NPPES Registry Identity

NPI1063401081
Entity TypeIndividualMale
Primary Taxonomy367500000X
Provider Legal NameDARWIN G GRAMSTADCredential: CRNA
Location Address6601 S MINNESOTA AVE, SUITE 100Sioux Falls, SD 57108-2564
Mailing Address6601 S Minnesota Ave, Suite 100Sioux Falls, SD 57108-2564 · (605) 336-6294 · Fax (605) 336-2672
Phone(605) 336-6294
Fax(605) 336-2672
Sole ProprietorNo
Enumeration DateOctober 21, 2005
Last NPPES UpdateJanuary 30, 2008
✔ NPI 1063401081 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Anesthetist, Certified RegisteredPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367500000X
License✔ Licensed in SD · R024467
Definition
(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, provides preoperative, intraoperative, and postoperative care to patients and assists in management and resuscitation of critical patients in intensive care, coronary care, and emergency situations. Nurse anesthetists are certified following successful completion of credentials and state licensure review and a national examination directed by the Council on Certification of Nurse Anesthetists. (2) A registered nurse who is qualified by special training to administer anesthesia in collaboration with a physician or dentist and who can assist in the care of patients who are in critical condition.
6601 S MINNESOTA AVE, Sioux Falls, SD 57108
Open in Google Maps ↗

Other Identifiers 2

Medicare PINS40592SD
Medicaid5751313SD

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Avera Health Plans, Wellmark Health Plan of Iowa, Inc., Wellmark of South Dakota, Inc..Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Darwin G Gramstad Crna is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Billing Reassignment

Medicare enrollment records show Darwin Gramstad reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ophthalmology Ltd Eye Surgery Center L L C
Same address
Ambulatory Surgical
6601 S. MINNESOTA AVENUE, SUITE 100
Sioux Falls, SD 57108
  • Reassigned Medicare billing, South Dakota enrollment
  • 24 clinicians in this Medicare group
NPI 1871581876 (605) 336-6294

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Anesthesia for lens surgery 00142
Anesthesia for lens surgery involves administering medication to numb the eye area, ensuring you feel no pain during the procedure. This can be a local anesthetic (numbing only the eye area) or general (where you're asleep). It helps make the surgery comfortable and stress-free.
519 services428 patients
Anesthesia for other procedure on eye 00140
Anesthesia for an eye procedure involves administering medication to numb your eye and surrounding area, ensuring you feel no pain during the operation. It can be local (only the eye area) or general (whole body). It's safe and helps make the procedure comfortable.
135 services123 patients
Anesthesia for retinal surgery 00145
Anesthesia for retinal surgery involves using medications to numb your eye and surrounding area. This prevents pain and discomfort during the procedure. You may also receive medication to help you relax. The anesthesia can be local (just your eye) or general (you're asleep).
112 services108 patients
Anesthesia for procedure on eyelid 00103
Anesthesia for an eyelid procedure helps ensure comfort and painlessness during the operation. It's typically a local anesthetic, applied to numb your eyelid and surrounding area. You'll likely be awake but won't feel any discomfort. It's a safe, routine part of many eye procedures.
80 services80 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Post-Anesthetic Transfer of Care Measure: Procedure Room to a Post Anesthesia Care Unit (PACU)
Percentage of patients, regardless of age, who are under the care of an anesthesia practitioner and are admitted to a PACU or other non-ICU location in which a post-anesthetic formal transfer of care protocol or checklist which includes the key transfer of…
100%1,751 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. DAVID R WEST M.D.
Ophthalmology
6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
DR. GREGORY D OSMUNDSON M.D.
Ophthalmology
6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
ADAM R BLEEKER MD
Ophthalmology
6601 S MINNESOTA AVE
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
DR. DUSTIN L DIERKS MD
Ophthalmology
6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
DR. ELIZABETH ANNE ATCHISON M.D.
Ophthalmology
6601 S MINNESOTA AVE
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
MICHAEL K. EIDE M.D.
Ophthalmology
6601 S MINNESOTA AVE, 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
DR. BYRON T HOHM M.D.
Ophthalmology
6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294
OPHTHALMOLOGY LTD
Ophthalmology
6601 S MINNESOTA AVE, SUITE 200
SIOUX FALLS, SD 57108
Lincoln County (605) 336-6294

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Darwin Gramstad's NPI number?

The NPI number for Darwin Gramstad is 1063401081. It was assigned to this individual provider in the NPPES registry on October 21, 2005.

Where is Darwin Gramstad located?

Darwin Gramstad practices at 6601 S Minnesota Ave Suite 100, Sioux Falls, SD 57108. The listed phone number is (605) 336-6294.

What is Darwin Gramstad's specialty?

The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.

Is Darwin Gramstad enrolled in Medicare?

Yes. Darwin Gramstad is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Darwin Gramstad's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Darwin Gramstad reassigns Medicare benefits to Ophthalmology Ltd Eye Surgery Center L L C (Sioux Falls, SD). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Darwin Gramstad's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Darwin Gramstad accept?

Health plans from Avera Health Plans, Wellmark Health Plan of Iowa, Inc. and Wellmark of South Dakota, Inc. list Darwin Gramstad as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Darwin Gramstad was last updated on January 30, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.