DR. JAMES SIERAKOWSKI DO
NPI 1346539004
Pediatrics - Pediatric Emergency Medicine in Greenville, SC
About Dr. James Sierakowski Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JAMES SIERAKOWSKI DO (NPI 1346539004) is an individual pediatric emergency medicine provider in Greenville, South Carolina, licensed in South Carolina (39919) and active in the NPI registry since April 2011. He is enrolled in Medicare PECOS and maintains a secondary practice location in Jacksonville.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 1
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. James Sierakowski Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show James Sierakowski reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Greenville, SC 29605
- Reassigned Medicare billing, South Carolina enrollment
- 413 clinicians in this Medicare group
Charleston, SC 29425
- Reassigned Medicare billing, South Carolina enrollment
- 140 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.
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.
GREENVILLE, SC 29605
GREENVILLE, SC 29605
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 James Sierakowski's NPI number?
The NPI number for James Sierakowski is 1346539004. It was assigned to this individual provider in the NPPES registry on April 4, 2011.
Where is James Sierakowski located?
James Sierakowski practices at 701 Grove Rd, Greenville, SC 29605. The listed phone number is (864) 455-7000.
What is James Sierakowski's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Emergency Medicine, with taxonomy code 2080P0204X.
Is James Sierakowski enrolled in Medicare?
Yes. James Sierakowski is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for James Sierakowski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Sierakowski reassigns Medicare benefits to 2 organizations: Prisma Health-Upstate (Greenville, SC) and Musc Affiliate Physicians (Charleston, SC). 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 James Sierakowski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does James Sierakowski accept?
Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of North Carolina, BlueCross BlueShield of South Carolina and First Choice Next and 2 other insurers list James Sierakowski 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 James Sierakowski was last updated on June 8, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Dr. James Sierakowski, DO · NPI 1346539004
Pediatric Emergency Medicine physician in Greenville, South Carolina. Individual provider, active in the CMS NPPES registry since April 4, 2011.
## Identity
- **NPI:** 1346539004 (Entity type: Individual)
- **Enumerated:** April 4, 2011
- **Primary specialty:** Pediatrics - Pediatric Emergency Medicine · taxonomy 2080P0204X
- **State license:** 39919 (South Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 701 GROVE RD, Greenville, SC 29605-4210
- **Phone:** (864) 455-7000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Prisma Health-Upstate (NPI 1225583115, Greenville, SC); Musc Affiliate Physicians (NPI 1548849482, Charleston, SC) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 8, 2021
- **Other identifiers:** Medicaid 399198 (SC)
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Source: [NPI Profile](https://npiprofile.com/npi/1346539004) · Data from the CMS NPPES public registry.