DR. MICHAEL CASEY FLANAGAN M.D.
NPI 1275516320
Internal Medicine - Advanced Heart Failure and Transplant Cardiology in Falls Church, VA
About Dr. Michael Casey Flanagan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL CASEY FLANAGAN M.D. (NPI 1275516320) is an individual advanced heart failure and transplant cardiology provider in Falls Church, Virginia, licensed in Virginia (0101238627) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Mary Washington Hospital, and maintains 7 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 7
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. Michael Casey Flanagan M.d. 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
5Medicare enrollment records show Michael Flanagan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Falls Church, VA 22042
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- Also billed through NPI 1588717755 (Virginia)
- 2,618 clinicians in this Medicare group
Washington, DC 20036
- Reassigned Medicare billing, Maryland enrollment
- 2,602 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, Maryland enrollment
- 184 clinicians in this Medicare group
Gaithersburg, MD 20878
- Reassigned Medicare billing, District of Columbia enrollment
- 340 clinicians in this Medicare group
Fredericksburg, VA 22401
- Reassigned Medicare billing, Virginia enrollment
- 133 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 6
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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mary Washington Hospital
Acute Care Hospitals · Fredericksburg, VAInova Alexandria Hospital
Acute Care Hospitals · Alexandria, VAInova Loudoun Hospital
Acute Care Hospitals · Leesburg, VAInova Fairfax Hospital
Acute Care Hospitals · Falls Church, VAInova Fair Oaks Hospital
Acute Care Hospitals · Fairfax, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22042 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
FALLS CHURCH, VA 22042
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 Michael Flanagan's NPI number?
The NPI number for Michael Flanagan is 1275516320. It was assigned to this individual provider in the NPPES registry on November 22, 2005.
Where is Michael Flanagan located?
Michael Flanagan practices at 3300 Gallows Rd, Falls Church, VA 22042. The listed phone number is (703) 776-4001.
What is Michael Flanagan's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Advanced Heart Failure and Transplant Cardiology, with taxonomy code 207RA0001X.
Is Michael Flanagan enrolled in Medicare?
Yes. Michael Flanagan 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 Michael Flanagan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Flanagan reassigns Medicare benefits to 5 organizations: Inova Health Care Services (Falls Church, VA), Medstar Medical Group II LLC (Washington, DC), Medstar Heart Institute LLC (Washington, DC), Adventist Physician Services, Inc. (Gaithersburg, MD) and Mary Washington Hospital, Inc. (Fredericksburg, VA). 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 Michael Flanagan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Michael Flanagan affiliated with any hospitals?
According to CMS data, Michael Flanagan is affiliated with Mary Washington Hospital, Inova Alexandria Hospital, Inova Loudoun Hospital, Inova Fairfax Hospital and Inova Fair Oaks Hospital.
When was this NPI record last updated?
The NPPES record for Michael Flanagan was last updated on October 25, 2021. 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.
# Dr. Michael Casey Flanagan, M.D. · NPI 1275516320
Advanced Heart Failure and Transplant Cardiology physician in Falls Church, Virginia. Individual provider, active in the CMS NPPES registry since November 22, 2005.
## Identity
- **NPI:** 1275516320 (Entity type: Individual)
- **Enumerated:** November 22, 2005
- **Primary specialty:** Internal Medicine - Advanced Heart Failure and Transplant Cardiology · taxonomy 207RA0001X
- **State license:** 0101238627 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 3300 GALLOWS RD, Falls Church, VA 22042-3300
- **Phone:** (703) 776-4001 · **Fax:** (703) 776-7113
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Inova Health Care Services (NPI 1952320061, Falls Church, VA); Medstar Medical Group II LLC (NPI 1376887844, Washington, DC); Medstar Heart Institute LLC (NPI 1528345378, Washington, DC); Adventist Physician Services, Inc. (NPI 1376623207, Gaithersburg, MD); Mary Washington Hospital, Inc. (NPI 1013089879, Fredericksburg, VA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Temple University School Of Medicine, class of 2004
## Record status
- **NPPES last updated:** October 25, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1275516320) · Data from the CMS NPPES public registry.