WILLIAM B HILLEGASS JR. MD
NPI 1619906112
Internal Medicine - Cardiovascular Disease in Jackson, MS
About William B Hillegass Jr. Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM B HILLEGASS JR. MD (NPI 1619906112) is an individual cardiovascular disease provider in Jackson, Mississippi, licensed in Mississippi (32921) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with University Of Mississippi Med Center, and is a graduate of Harvard Medical School (1988).
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 and accepts Medicare assignment
William B Hillegass Jr. Md 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 Reassignment
Medicare enrollment records show William Hillegass reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Jackson, MS 39216
- Reassigned Medicare billing, Mississippi enrollment
- 1,932 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.
University Of Mississippi Med Center
Acute Care Hospitals · Jackson, MSPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 39211 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 William Hillegass's NPI number?
The NPI number for William Hillegass is 1619906112. It was assigned to this individual provider in the NPPES registry on June 30, 2006.
Where is William Hillegass located?
William Hillegass practices at Select Specialty - Cardiology 5903 Ridgewood Road, Jackson, MS 39211. The listed phone number is (601) 984-5678.
What is William Hillegass's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is William Hillegass enrolled in Medicare?
Yes. William Hillegass 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 organization bills Medicare for William Hillegass's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Hillegass reassigns Medicare benefits to State Of Mississippi - University Of Mississippi Medical Center (Jackson, MS). 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 William Hillegass's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Hillegass accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter of Alabama and Ambetter of Tennessee and 2 other insurers list William Hillegass 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 William Hillegass affiliated with any hospitals?
According to CMS data, William Hillegass is affiliated with University Of Mississippi Med Center.
When was this NPI record last updated?
The NPPES record for William Hillegass was last updated on August 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# William B Hillegass Jr., MD · NPI 1619906112
Cardiovascular Disease physician in Jackson, Mississippi. Individual provider, active in the CMS NPPES registry since June 30, 2006.
## Identity
- **NPI:** 1619906112 (Entity type: Individual)
- **Enumerated:** June 30, 2006
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 32921 (Mississippi)
- **Sole proprietor:** No
## Practice location
- **Address:** SELECT SPECIALTY - CARDIOLOGY, 5903 RIDGEWOOD ROAD, Jackson, MS 39211-1900
- **Phone:** (601) 984-5678
## 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:** State Of Mississippi - University Of Mississippi Medical Center (NPI 1477734689, Jackson, MS), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1988
## Record status
- **NPPES last updated:** August 28, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1619906112) · Data from the CMS NPPES public registry.