MARY JANE MCMAHON REEN M.D.
NPI 1669867784
Pediatrics in Washington, DC

Q: What is Mary Jane Reen's NPI number?

The NPI number for Mary Jane Reen is 1669867784. It was assigned to this individual provider in the NPPES registry on April 6, 2015.

Q: What is Mary Jane Reen's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Q: When was this NPI record last updated?

The NPPES record for Mary Jane Reen was last updated on July 17, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.

Active since April 06, 2015PECOS Enrolled

3800 RESERVOIR RD NW, DEPT OF PEDIATRICS, WASHINGTON, DC 20007(202) 243-3434(202) 243-3234 Get Directions Write a Review

NPPES record last updated: July 17, 2019. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Mary Jane Mcmahon Reen M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARY JANE MCMAHON REEN M.D. (NPI 1669867784) is an individual pediatrics provider in Washington, District Of Columbia, licensed in District Of Columbia (MD046450) and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1669867784

Entity TypeIndividualFemale

Primary Taxonomy208000000X

Provider Legal NameMARY JANE MCMAHON REENCredential: M.D.

Location Address3800 RESERVOIR RD NW, DEPT OF PEDIATRICSWashington, DC 20007-2113

Mailing Address3800 Reservoir Rd Nw, Dept Of PediatricsWashington, DC 20007-2113 · (202) 243-3434 · Fax (202) 243-3234

Phone(202) 243-3434

Fax(202) 243-3234

Sole ProprietorYes

Enumeration DateApril 6, 2015

Last NPPES UpdateJuly 17, 2019

✔ NPI 1669867784 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians

Taxonomy Code208000000X

License✔ Licensed in DC · MD046450

Definition

A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

3800 RESERVOIR RD NW, Washington, DC 20007

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mary Jane Mcmahon Reen M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Mary Jane Reen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Medstar Medical Group II LLC

Same address

Critical Care Medicine

3800 RESERVOIR RD NW
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

NPI 1205562816 (703) 558-1403

Mgmc LLC

Same address

Psychiatry

3800 RESERVOIR RD NW
Washington, DC 20007

Reassigned Medicare billing, District of Columbia and Maryland enrollments
Also billed through NPI 1891797148 (Maryland)
861 clinicians in this Medicare group

NPI 1316949654 (888) 896-1400

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician 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.

New Patient

$100.31 typical visit price

range $65.18 – $194.86

Typical copayment $25.07 (range $16.29 – $48.71)

Most-billed visit code 99203

Established Patient

$113.72 typical visit price

range $21.40 – $158.88

Typical copayment $28.43 (range $5.35 – $39.72)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DR. KAUSTUBH SUBHASH YADWADKAR M.D.

Radiology (Diagnostic Radiology)

3800 RESERVOIR RD NW, CG201
WASHINGTON, DC 20007

District of Columbia (304) 206-7595

FRED MO MD

Orthopaedic Surgery (Orthopaedic Surgery of the Spine)

3800 RESERVOIR RD NW
WASHINGTON, DC 20007

District of Columbia (202) 444-8766

SEBLE YIRGA

Nurse Practitioner (Family)

3800 RESERVOIR RD NW
WASHINGTON, DC 20007

District of Columbia (202) 444-7265

ARLETTE THOMPSON-PILE

Physical Therapy Assistant

3800 RESERVOIR RD NW, PHYSICAL MEDICINE AND REHBAILITATION DEPARTMENT
WASHINGTON, DC 20007

District of Columbia (202) 444-3689

JENNA ELIZABETH HOROWITZ

Physician Assistant (Surgical)

3800 RESERVOIR RD NW, NEUROSURGERY DEPARTMENT
WASHINGTON, DC 20007

District of Columbia (202) 444-2000

HALEY SWANSON FOSTER M.D.

Radiology (Vascular & Interventional Radiology)

3800 RESERVOIR RD NW
WASHINGTON, DC 20007

District of Columbia (202) 444-5022

CLAIRE DALBY MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW
WASHINGTON, DC 20007

District of Columbia (202) 444-7106

MS. AMANDA JORDAN SUN PA-C

Physician Assistant

3800 RESERVOIR RD NW
WASHINGTON, DC 20007

District of Columbia (877) 772-6505

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 Mary Jane Reen's NPI number?

The NPI number for Mary Jane Reen is 1669867784. It was assigned to this individual provider in the NPPES registry on April 6, 2015.

Where is Mary Jane Reen located?

Mary Jane Reen practices at 3800 Reservoir Rd NW Dept Of Pediatrics, Washington, DC 20007. The listed phone number is (202) 243-3434.

What is Mary Jane Reen's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Mary Jane Reen enrolled in Medicare?

Yes. Mary Jane Reen is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mary Jane Reen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Jane Reen reassigns Medicare benefits to 2 organizations: Medstar Medical Group II LLC (Washington, DC) and Mgmc LLC (Washington, DC). 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 Mary Jane Reen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mary Jane Reen was last updated on July 17, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.