DR. GRANT SIZEMORE M.D.
NPI 1942682281
Surgery in Dubuque, IA
About Dr. Grant Sizemore M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GRANT SIZEMORE M.D. (NPI 1942682281) is an individual surgery provider in Dubuque, Iowa, licensed in Iowa (MD-56679) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with Mercyone Dubuque Medical Center, and is a graduate of University Of South Florida College Of Medicine (2015).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Grant Sizemore M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Grant Sizemore reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Dubuque, IA 52002
- Reassigned Medicare billing, Iowa enrollment
- 272 clinicians in this Medicare group
Augusta, GA 30901
- Reassigned Medicare billing, Georgia enrollment
- 27 clinicians in this Medicare group
Honolulu, HI 96826
- Reassigned Medicare billing, Hawaii enrollment
- 370 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercyone Dubuque Medical Center
Acute Care Hospitals · Dubuque, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 52001 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 Grant Sizemore's NPI number?
The NPI number for Grant Sizemore is 1942682281. It was assigned to this individual provider in the NPPES registry on June 23, 2015.
Where is Grant Sizemore located?
Grant Sizemore practices at 1000 Langworthy St, Dubuque, IA 52001. The listed phone number is (563) 584-3450.
What is Grant Sizemore's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Grant Sizemore enrolled in Medicare?
Yes. Grant Sizemore is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Grant Sizemore's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grant Sizemore reassigns Medicare benefits to 3 organizations: Medical Associates Clinic P C (Dubuque, IA), Augusta Surgical Group, P.C. (Augusta, GA) and Kapiolani Medical Specialists (Honolulu, HI). 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 Grant Sizemore's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Grant Sizemore accept?
Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 2 other insurers list Grant Sizemore 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.
Is Grant Sizemore affiliated with any hospitals?
According to CMS data, Grant Sizemore is affiliated with Mercyone Dubuque Medical Center.
When was this NPI record last updated?
The NPPES record for Grant Sizemore was last updated on June 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Grant Sizemore, M.D. · NPI 1942682281
Surgery physician in Dubuque, Iowa. Individual provider, active in the CMS NPPES registry since June 23, 2015.
## Identity
- **NPI:** 1942682281 (Entity type: Individual)
- **Enumerated:** June 23, 2015
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** MD-56679 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 1000 LANGWORTHY ST, Dubuque, IA 52001-7313
- **Phone:** (563) 584-3450 · **Fax:** (563) 584-3171
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Medical Associates Clinic P C (NPI 1457300790, Dubuque, IA); Augusta Surgical Group, P.C. (NPI 1275626038, Augusta, GA); Kapiolani Medical Specialists (NPI 1124071014, Honolulu, HI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of South Florida College Of Medicine, class of 2015
## Record status
- **NPPES last updated:** June 29, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1942682281) · Data from the CMS NPPES public registry.