DR. STEVEN J MASON M.D.
NPI 1366445603
Internal Medicine - Cardiovascular Disease in Baltimore, MD
About Dr. Steven J Mason M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEVEN J MASON M.D. (NPI 1366445603) is an individual cardiovascular disease provider in Baltimore, Maryland, licensed in Maryland (D0017347) and active in the NPI registry since May 2005. He is enrolled in Medicare PECOS, is affiliated with Physicians Regional Medical Center - Pine Ridge, and is a graduate of Harvard Medical School (1972).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Steven J Mason M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Steven Mason reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21224
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Towson, MD 21286
- Reassigned Medicare billing, Maryland enrollment
- 444 clinicians in this Medicare group
Naples, FL 34119
- Reassigned Medicare billing, Florida enrollment
- 16 clinicians in this Medicare group
Naples, FL 34102
- Reassigned Medicare billing, Florida enrollment
- 11 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Physicians Regional Medical Center - Pine Ridge
Acute Care Hospitals · Naples, FLGreater Baltimore Medical Center
Acute Care Hospitals · Baltimore, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21237 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.
BALTIMORE, MD 21237
BALTIMORE, MD 21237
BALTIMORE, MD 21237
BALTIMORE, MD 21237
BALTIMORE, MD 21237
BALTIMORE, MD 21237
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 Steven Mason's NPI number?
The NPI number for Steven Mason is 1366445603. It was assigned to this individual provider in the NPPES registry on May 31, 2005.
Where is Steven Mason located?
Steven Mason practices at 9105 Franklin Square Dr Ste 209, Baltimore, MD 21237. The listed phone number is (410) 574-1330.
What is Steven Mason's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Steven Mason enrolled in Medicare?
Yes. Steven Mason is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Steven Mason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Steven Mason reassigns Medicare benefits to 4 organizations: Johns Hopkins University (Baltimore, MD), Greater Baltimore Medical Center, Inc. (Towson, MD), Naples Heart Rhythm Specialists PA (Naples, FL) and Swicft Medical Partners LLC (Naples, FL). 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 Steven Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Steven Mason accept?
Health plans from Florida Blue (BlueCross BlueShield FL) list Steven 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 Steven Mason affiliated with any hospitals?
According to CMS data, Steven Mason is affiliated with Physicians Regional Medical Center - Pine Ridge and Greater Baltimore Medical Center.
When was this NPI record last updated?
The NPPES record for Steven Mason was last updated on August 30, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Dr. Steven J Mason, M.D. · NPI 1366445603
Cardiovascular Disease physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since May 31, 2005.
## Identity
- **NPI:** 1366445603 (Entity type: Individual)
- **Enumerated:** May 31, 2005
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** D0017347 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 9105 FRANKLIN SQUARE DR, STE 209, Baltimore, MD 21237-3958
- **Phone:** (410) 574-1330 · **Fax:** (410) 574-2691
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1275515546, Baltimore, MD); Greater Baltimore Medical Center, Inc. (NPI 1760204721, Towson, MD); Naples Heart Rhythm Specialists PA (NPI 1730376708, Naples, FL); Swicft Medical Partners LLC (NPI 1609986181, Naples, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1972
## Record status
- **NPPES last updated:** August 30, 2010
- **Other identifiers:** Medicare ID-Type Unspecified 000L232X (MD); Medicare UPIN D74513 (MD); Medicaid 430361000 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1366445603) · Data from the CMS NPPES public registry.