DR. PETER J MASON MD
NPI 1144282120
Internal Medicine - Cardiovascular Disease in Madison, WI
About Dr. Peter J Mason Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. PETER J MASON MD (NPI 1144282120) is an individual cardiovascular disease provider in Madison, Wisconsin, licensed in Wisconsin (49077) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Unc Hospitals, and maintains a secondary practice location in Sanford.
NPPES Registry Identity
Specialties & Licenses 4
Secondary Practice Location 1
Other Identifiers 2
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. Peter J Mason 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 Reassignments
6Medicare enrollment records show Peter Mason reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Menomonee Falls, WI 53051
- Reassigned Medicare billing, Wisconsin enrollment
- 2,294 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Childrens Specialty Group Inc
- 424 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
Menasha, WI 54952
- Reassigned Medicare billing, Wisconsin enrollment
- 988 clinicians in this Medicare group
South Boston, VA 24592
- Reassigned Medicare billing, North Carolina enrollment
- 2,797 clinicians in this Medicare group
Burlington, NC 27215
- Reassigned Medicare billing, North Carolina enrollment
- 1,337 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 10
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.
Unc Hospitals
Acute Care Hospitals · Chapel Hill, NCPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53703 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 Peter Mason's NPI number?
The NPI number for Peter Mason is 1144282120. It was assigned to this individual provider in the NPPES registry on April 5, 2006.
Where is Peter Mason located?
Peter Mason practices at 350 S Hamilton St Unit 501, Madison, WI 53703. The listed phone number is (608) 443-8931.
What is Peter Mason's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Peter Mason enrolled in Medicare?
Yes. Peter Mason 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 Peter Mason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Peter Mason reassigns Medicare benefits to 6 organizations: Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI), Children's Specialty Group, Inc. (Milwaukee, WI), The Medical College Of Wisconsin, Inc. (Milwaukee, WI), Thedacare, Incorporated (Menasha, WI), University Of North Carolina At Chapel Hill (South Boston, VA) and 1 more organization, 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 Peter Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Peter Mason accept?
Health plans from Blue Cross and Blue Shield of NC, Network Health and UnitedHealthcare list Peter Mason 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 Peter Mason affiliated with any hospitals?
According to CMS data, Peter Mason is affiliated with Unc Hospitals.
When was this NPI record last updated?
The NPPES record for Peter Mason was last updated on May 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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. Peter J Mason, MD · NPI 1144282120
Cardiovascular Disease physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since April 5, 2006.
## Identity
- **NPI:** 1144282120 (Entity type: Individual)
- **Enumerated:** April 5, 2006
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 49077 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 350 S HAMILTON ST UNIT 501, Madison, WI 53703-4186
- **Phone:** (608) 443-8931
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (NPI 1568787448, Menomonee Falls, WI); Children's Specialty Group, Inc. (NPI 1942970405, Milwaukee, WI); The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); Thedacare, Incorporated (NPI 1306959515, Menasha, WI); University Of North Carolina At Chapel Hill (NPI 1407308703, South Boston, VA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 1997
## Record status
- **NPPES last updated:** May 13, 2026
- **Other identifiers:** Medicaid 34838100 (WI); Medicaid 1144282120 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1144282120) · Data from the CMS NPPES public registry.