KAREN TONYA MASON MD
NPI 1598858086
Emergency Medicine in Upper Marlboro, MD
About Karen Tonya Mason Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN TONYA MASON MD (NPI 1598858086) is an individual emergency medicine provider in Upper Marlboro, Maryland, licensed in Maryland (D56418) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS, is affiliated with Marion Communtiy Hospital, and maintains a secondary practice location in Baltimore.
NPPES Registry Identity
Specialties & Licenses
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
Karen Tonya 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
10Medicare enrollment records show Karen Mason reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Suitland, MD 20746
- Reassigned Medicare billing, District of Columbia enrollment
- 2,492 clinicians in this Medicare group
Augusta, GA 30901
- Reassigned Medicare billing, Georgia enrollment
- 159 clinicians in this Medicare group
Atlanta, GA 30305
- Reassigned Medicare billing, Georgia enrollment
- 1,389 clinicians in this Medicare group
Haleyville, AL 35565
- Reassigned Medicare billing, Alabama enrollment
- 40 clinicians in this Medicare group
Aventura, FL 33180
- Reassigned Medicare billing, Florida enrollment
- 1,912 clinicians in this Medicare group
Miami Lakes, FL 33016
- Reassigned Medicare billing, Florida and Arizona enrollments
- Also billed through NPI 1932810215 (Arizona)
- 31 clinicians in this Medicare group
New Iberia, LA 70560
- Reassigned Medicare billing, Louisiana enrollment
- 83 clinicians in this Medicare group
Lawton, OK 73507
- Reassigned Medicare billing, Texas enrollment
- 347 clinicians in this Medicare group
Crownpoint, NM 87313
- Reassigned Medicare billing, Texas enrollment
- 265 clinicians in this Medicare group
Polacca, AZ 86042
- Reassigned Medicare billing, Texas enrollment
- 199 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
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marion Communtiy Hospital
Acute Care Hospitals · Ocala, FLHca Florida Blake Hospital
Acute Care Hospitals · Bradenton, FLPiedmont Augusta Hospital
Acute Care Hospitals · Augusta, GAUniversity Mcduffie County Regional Medical Center
Acute Care Hospitals · Thomson, GAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20774 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.
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
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 Karen Mason's NPI number?
The NPI number for Karen Mason is 1598858086. It was assigned to this individual provider in the NPPES registry on October 2, 2006.
Where is Karen Mason located?
Karen Mason practices at 1221 Mercantile Ln, Upper Marlboro, MD 20774. The listed phone number is (301) 938-3541.
What is Karen Mason's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Karen Mason enrolled in Medicare?
Yes. Karen 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 Karen Mason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Mason reassigns Medicare benefits to 10 organizations: Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Suitland, MD), Peach State Emergency Physicians LLC (Augusta, GA), The Southeast Permanente Medical Group (Atlanta, GA), Sycamore Lakeland LLC (Haleyville, AL), Emergency Medicine Services Of Fl, LLC (Aventura, FL) and 5 more organizations, 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 Karen Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Mason accept?
Health plans from Oscar Health Maintenance Organization of Florida list Karen 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 Karen Mason affiliated with any hospitals?
According to CMS data, Karen Mason is affiliated with Marion Communtiy Hospital, Hca Florida Blake Hospital, Piedmont Augusta Hospital and University Mcduffie County Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Karen Mason was last updated on January 10, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Karen Tonya Mason, MD · NPI 1598858086
Emergency Medicine physician in Upper Marlboro, Maryland. Individual provider, active in the CMS NPPES registry since October 2, 2006.
## Identity
- **NPI:** 1598858086 (Entity type: Individual)
- **Enumerated:** October 2, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** D56418 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 1221 MERCANTILE LN, Upper Marlboro, MD 20774-5374
- **Phone:** (301) 938-3541
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (NPI 1730200965, Suitland, MD); Peach State Emergency Physicians LLC (NPI 1053170605, Augusta, GA); The Southeast Permanente Medical Group (NPI 1245266956, Atlanta, GA); Sycamore Lakeland LLC (NPI 1184472789, Haleyville, AL); Emergency Medicine Services Of Fl, LLC (NPI 1043917180, Aventura, FL); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Howard University College Of Medicine, class of 1996
## Record status
- **NPPES last updated:** January 10, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1598858086) · Data from the CMS NPPES public registry.