DR. MASON JAMES WALGRAVE M.D.
NPI 1144670662
Hospitalist in Charleston, SC
About Dr. Mason James Walgrave M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MASON JAMES WALGRAVE M.D. (NPI 1144670662) is an individual hospitalist provider in Charleston, South Carolina, licensed in South Carolina (39795) and active in the NPI registry since June 2016. He is enrolled in Medicare PECOS, is affiliated with Musc Medical Center, and maintains a secondary practice location in Charleston.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 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 and accepts Medicare assignment
Dr. Mason James Walgrave M.d. 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
2Medicare enrollment records show Mason Walgrave reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Charleston, SC 29425
- Reassigned Medicare billing, South Carolina enrollment
- Medicare enrollment name: University Medical Associates Of The Medical University Of South Carol
- 2,594 clinicians in this Medicare group
Charleston, SC 29414
- Reassigned Medicare billing, South Carolina enrollment
- Medicare enrollment name: Bon Secours St Francis Xavier Hospital Inc
- 375 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Musc Medical Center
Acute Care Hospitals · Charleston, SCPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 29425 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.
CHARLESTON, SC 29425
CHARLESTON, SC 29425
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 Mason Walgrave's NPI number?
The NPI number for Mason Walgrave is 1144670662. It was assigned to this individual provider in the NPPES registry on June 15, 2016.
Where is Mason Walgrave located?
Mason Walgrave practices at 169 Ashley Ave Room 202 Main Hospital Msc333, Charleston, SC 29425. The listed phone number is (843) 792-0435.
What is Mason Walgrave's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Mason Walgrave enrolled in Medicare?
Yes. Mason Walgrave 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 Mason Walgrave's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mason Walgrave reassigns Medicare benefits to 2 organizations: University Medical Associates (Charleston, SC) and Bon Secours St. Francis Xavier Hosptial, Inc. (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 Mason Walgrave's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mason Walgrave accept?
Health plans from BlueCross BlueShield of South Carolina and First Choice Next list Mason Walgrave 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 Mason Walgrave affiliated with any hospitals?
According to CMS data, Mason Walgrave is affiliated with Musc Medical Center.
When was this NPI record last updated?
The NPPES record for Mason Walgrave was last updated on October 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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. Mason James Walgrave, M.D. · NPI 1144670662
Hospitalist physician in Charleston, South Carolina. Individual provider, active in the CMS NPPES registry since June 15, 2016.
## Identity
- **NPI:** 1144670662 (Entity type: Individual)
- **Enumerated:** June 15, 2016
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 39795 (South Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 169 ASHLEY AVE, ROOM 202 MAIN HOSPITAL MSC333, Charleston, SC 29425-8905
- **Phone:** (843) 792-0435
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): University Medical Associates (NPI 1548413453, Charleston, SC); Bon Secours St. Francis Xavier Hosptial, Inc. (NPI 1578929634, Charleston, SC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of North Texas Hsc, College Of Osteopathic Med, class of 2016
## Record status
- **NPPES last updated:** October 29, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1144670662) · Data from the CMS NPPES public registry.