DAVID S GRENDA MD, PHD
NPI 1336344928
Anesthesiology in Eau Claire, WI
About David S Grenda Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DAVID S GRENDA MD, PHD (NPI 1336344928) is an individual anesthesiology provider in Eau Claire, Wisconsin, licensed in Wisconsin (86153-20) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS, is affiliated with Mayo Clinic Health System-franciscan Medical Center Inc, and maintains a secondary practice location in Atlanta.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
David S Grenda Md, Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
9Medicare enrollment records show David Grenda reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Eau Claire, WI 54701
- Reassigned Medicare billing, Wisconsin enrollment
- 1,248 clinicians in this Medicare group
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin enrollment
- 1,003 clinicians in this Medicare group
Jasper, GA 30143
- Reassigned Medicare billing, Georgia enrollment
- 317 clinicians in this Medicare group
Dawsonville, GA 30534
- Reassigned Medicare billing, Georgia enrollment
- 466 clinicians in this Medicare group
Lawrenceville, GA 30046
- Reassigned Medicare billing, Georgia enrollment
- 275 clinicians in this Medicare group
Atlanta, GA 30309
- Reassigned Medicare billing, Georgia enrollment
- 539 clinicians in this Medicare group
Atlanta, GA 30309
- Reassigned Medicare billing, Georgia enrollment
- 441 clinicians in this Medicare group
Stone Mountain, GA 30087
- Reassigned Medicare billing, Georgia enrollment
- 650 clinicians in this Medicare group
Stockbridge, GA 30281
- Reassigned Medicare billing, Georgia enrollment
- 713 clinicians in this Medicare group
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 5
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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mayo Clinic Health System-Franciscan Medical Center Inc
Acute Care Hospitals · La Crosse, WIMayo Clinic Health System Eau Claire Hospital
Acute Care Hospitals · Eau Claire, WIMayo Clinic Health System-Red Cedar Inc
Critical Access Hospitals · Menomonie, WIMedicare 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.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
EAU CLAIRE, WI 54703
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 David Grenda's NPI number?
The NPI number for David Grenda is 1336344928. It was assigned to this individual provider in the NPPES registry on June 15, 2007.
Where is David Grenda located?
David Grenda practices at 1400 Bellinger Street, Eau Claire, WI 54703. The listed phone number is (715) 833-5222.
What is David Grenda's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is David Grenda enrolled in Medicare?
Yes. David Grenda is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for David Grenda's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Grenda reassigns Medicare benefits to 9 organizations: Mayo Clinic Health System-Northwest Wisconsin Region, Inc. (Eau Claire, WI), Mayo Clinic Health System-Southwest Wisconsin Region, Inc. (La Crosse, WI), Piedmont Specialty Hospital Billing LLC (Jasper, GA), Northside Primary Care Professional Services, LLC (Dawsonville, GA), Gwinnett Physician Group, LLC (Lawrenceville, GA) and 4 more organizations, listed in the Medicare section above. Each 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 David Grenda's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is David Grenda affiliated with any hospitals?
According to CMS data, David Grenda is affiliated with Mayo Clinic Health System-Franciscan Medical Center Inc, Mayo Clinic Health System Eau Claire Hospital and Mayo Clinic Health System-Red Cedar Inc.
When was this NPI record last updated?
The NPPES record for David Grenda was last updated on September 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.
# David S Grenda, MD, PHD · NPI 1336344928
Anesthesiology physician in Eau Claire, Wisconsin. Individual provider, active in the CMS NPPES registry since June 15, 2007.
## Identity
- **NPI:** 1336344928 (Entity type: Individual)
- **Enumerated:** June 15, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 86153-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1400 BELLINGER STREET, Eau Claire, WI 54703-5222
- **Phone:** (715) 833-5222
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 9 organizations under Medicare reassignment (form CMS-855R): Mayo Clinic Health System-Northwest Wisconsin Region, Inc. (NPI 1235588831, Eau Claire, WI); Mayo Clinic Health System-Southwest Wisconsin Region, Inc. (NPI 1629056049, La Crosse, WI); Piedmont Specialty Hospital Billing LLC (NPI 1699290510, Jasper, GA); Northside Primary Care Professional Services, LLC (NPI 1215369715, Dawsonville, GA); Gwinnett Physician Group, LLC (NPI 1578574661, Lawrenceville, GA); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2007
## Record status
- **NPPES last updated:** September 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1336344928) · Data from the CMS NPPES public registry.