DOUGLAS J MAYSON MD
NPI 1821226622
Psychiatry & Neurology - Vascular Neurology in Washington, DC
About Douglas J Mayson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DOUGLAS J MAYSON MD (NPI 1821226622) is an individual vascular neurology provider in Washington, District Of Columbia, licensed in District Of Columbia (MD 042329) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS, is affiliated with Medstar Franklin Square Medical Center, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
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
Douglas J Mayson 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
4Medicare enrollment records show Douglas Mayson reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20007
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- Also billed through NPI 1376887844 (Maryland)
- 3,530 clinicians in this Medicare group
Washington, DC 20007
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- Also billed through NPI 1891797148 (Maryland)
- 861 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 87 clinicians in this Medicare group
Valhalla, NY 10595
- Reassigned Medicare billing, New York enrollment
- 1,663 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Medstar Franklin Square Medical Center
Acute Care Hospitals · Rosedale, MDMedstar Saint Mary's Hospital
Acute Care Hospitals · Leonardtown, MDCalverthealth Medical Center
Acute Care Hospitals · Prince Frederick, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20007 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.
WASHINGTON, DC 20007
WASHINGTON, DC 20007
WASHINGTON, DC 20007
WASHINGTON, DC 20007
WASHINGTON, DC 20007
WASHINGTON, DC 20007
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 Douglas Mayson's NPI number?
The NPI number for Douglas Mayson is 1821226622. It was assigned to this individual provider in the NPPES registry on June 30, 2009.
Where is Douglas Mayson located?
Douglas Mayson practices at 3800 Reservoir Rd NW Georgetown University Hospital - Phc7, Washington, DC 20007. The listed phone number is (617) 999-7524.
What is Douglas Mayson's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Vascular Neurology, with taxonomy code 2084V0102X.
Is Douglas Mayson enrolled in Medicare?
Yes. Douglas Mayson 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 Douglas Mayson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Douglas Mayson reassigns Medicare benefits to 4 organizations: Medstar Medical Group II LLC (Washington, DC), Mgmc LLC (Washington, DC), Medstar Total Elder Care LLC (Washington, DC) and Westchester Medical Center Advanced Physician Services PC (Valhalla, NY). 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 Douglas Mayson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Douglas Mayson affiliated with any hospitals?
According to CMS data, Douglas Mayson is affiliated with Medstar Franklin Square Medical Center, Medstar Saint Mary's Hospital and Calverthealth Medical Center.
When was this NPI record last updated?
The NPPES record for Douglas Mayson was last updated on June 23, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Douglas J Mayson, MD · NPI 1821226622
Vascular Neurology physician in Washington, District of Columbia. Individual provider, active in the CMS NPPES registry since June 30, 2009.
## Identity
- **NPI:** 1821226622 (Entity type: Individual)
- **Enumerated:** June 30, 2009
- **Primary specialty:** Psychiatry & Neurology - Vascular Neurology · taxonomy 2084V0102X
- **State license:** MD 042329 (District of Columbia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3800 RESERVOIR RD NW, GEORGETOWN UNIVERSITY HOSPITAL - PHC7, Washington, DC 20007-2113
- **Phone:** (617) 999-7524
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Medstar Medical Group II LLC (NPI 1205562816, Washington, DC); Mgmc LLC (NPI 1316949654, Washington, DC); Medstar Total Elder Care LLC (NPI 1750752911, Washington, DC); Westchester Medical Center Advanced Physician Services PC (NPI 1740687458, Valhalla, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** June 23, 2020
- **Other identifiers:** Medicaid 03748450 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1821226622) · Data from the CMS NPPES public registry.