MASON ROBERT MARSHALL DO
NPI 1609401736
Pathology - Anatomic Pathology & Clinical Pathology in Pittsburgh, PA
About Mason Robert Marshall Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MASON ROBERT MARSHALL DO (NPI 1609401736) is an individual anatomic pathology & clinical pathology provider in Pittsburgh, Pennsylvania, licensed in Wisconsin (82022-21) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with Fort Memorial Hospital, and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
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
Mason Robert Marshall Do 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 Marshall reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Madison, WI 53715
- Reassigned Medicare billing, Wisconsin enrollment
- 20 clinicians in this Medicare group
Monroe, WI 53566
- Reassigned Medicare billing, Wisconsin enrollment
- 376 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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Fort Memorial Hospital
Acute Care Hospitals · Fort Atkinson, WISsm Health St Mary's Hospital - Madison
Acute Care Hospitals · Madison, WISauk Prairie Hospital
Acute Care Hospitals · Prairie Du Sac, WISsm Health St Mary's Hospital - Janesville
Acute Care Hospitals · Janesville, WISouthwest Health Center
Critical Access Hospitals · Platteville, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 15270 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 Mason Marshall's NPI number?
The NPI number for Mason Marshall is 1609401736. It was assigned to this individual provider in the NPPES registry on March 9, 2020.
Where is Mason Marshall located?
Mason Marshall practices at 3550 Terrace Street Pathology Education Office A711, Pittsburgh, PA 15270. The listed phone number is (412) 802-6014.
What is Mason Marshall's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.
Is Mason Marshall enrolled in Medicare?
Yes. Mason Marshall 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 Marshall's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mason Marshall reassigns Medicare benefits to 2 organizations: Associated Pathologists, Sc (Madison, WI) and The Monroe Clinic, Inc. (Monroe, WI). 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 Marshall's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mason Marshall affiliated with any hospitals?
According to CMS data, Mason Marshall is affiliated with Fort Memorial Hospital, Ssm Health St Mary's Hospital - Madison, Sauk Prairie Hospital, Ssm Health St Mary's Hospital - Janesville and Southwest Health Center.
When was this NPI record last updated?
The NPPES record for Mason Marshall was last updated on February 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Mason Robert Marshall, DO · NPI 1609401736
Anatomic Pathology & Clinical Pathology physician in Pittsburgh, Pennsylvania. Individual provider, active in the CMS NPPES registry since March 9, 2020.
## Identity
- **NPI:** 1609401736 (Entity type: Individual)
- **Enumerated:** March 9, 2020
- **Primary specialty:** Pathology - Anatomic Pathology & Clinical Pathology · taxonomy 207ZP0102X
- **State license:** 82022-21 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 3550 TERRACE STREET PATHOLOGY EDUCATION OFFICE A711, Pittsburgh, PA 15270-4494
- **Phone:** (412) 802-6014
## 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): Associated Pathologists, Sc (NPI 1396782231, Madison, WI); The Monroe Clinic, Inc. (NPI 1386720548, Monroe, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** February 25, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1609401736) · Data from the CMS NPPES public registry.