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ANTOINETTE MARIE STEWART M.D.
NPI 1215014659
Psychiatry & Neurology - Child & Adolescent Psychiatry in Rockville, MD

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment
11921 ROCKVILLE PIKE STE 402, ROCKVILLE, MD 20852(425) 658-2254(301) 888-8261 Get Directions Write a Review

NPPES record last updated: July 30, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 15, 2021, Mar 17, 2018, Feb 19, 2018 (3 updates tracked since 2018).

About Antoinette Marie Stewart M.d. NPPES

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

ANTOINETTE MARIE STEWART M.D. (NPI 1215014659) is an individual child & adolescent psychiatry provider in Rockville, Maryland, licensed in Virginia (0101236941) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (1996).

NPPES Registry Identity

NPI1215014659
Entity TypeIndividualFemale
Primary Taxonomy2084P0804X
Provider Legal NameANTOINETTE MARIE STEWARTCredential: M.D.
Location Address11921 ROCKVILLE PIKE STE 402Rockville, MD 20852-2757
Mailing Address11921 Rockville Pike Ste 402Rockville, MD 20852-2757 · (425) 658-2254 · Fax (301) 888-8261
Phone(425) 658-2254
Fax(301) 888-8261
Sole ProprietorNo
Medical School CMSOtherGraduated 1996
Enumeration DateNovember 1, 2006
Last NPPES UpdateJuly 30, 20253 updates tracked since enumeration
NPPES CertifiedJuly 30, 2025
✔ NPI 1215014659 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · Child & Adolescent PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0804X
License✔ Licensed in VA · 0101236941
Definition
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
Also ListedPsychiatry & Neurology · PsychiatryTaxonomy 2084P0800X · License 2005-1477 (NC)
11921 ROCKVILLE PIKE STE 402, Rockville, MD 20852
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Secondary Practice Locations 3

Location 113215 Brook LaneHagerstown, MD 21742-1514 · Phone (301) 733-0330 ext. 1146 · Fax (301) 733-4038
Location 212359 Sunrise Valley Dr Ste 320Reston, VA 20191-3463 · Phone (703) 596-4796 · Fax (703) 787-8210
Location 32445 W 34th StErie, PA 16506-3549 · Phone (814) 835-7621 · Fax (814) 835-2906

Other Identifiers 1

Medicaid5902445NC

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.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

Antoinette Marie Stewart 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.

PECOS PAC ID547203721
PECOS Enrollment IDI20160201000256, I20171025001381, I20250221003418
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 Reassignment

Medicare enrollment records show Antoinette Stewart reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Columbia Associates In Psychiatry PC
10 mi
Psychiatry
2501 N GLEBE RD, SUITE 303
Arlington, VA 22207
  • Reassigned Medicare billing, District of Columbia, Maryland and Virginia enrollments
  • 267 clinicians in this Medicare group
NPI 1699012930 (703) 841-1290

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

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHRONE HESTON LMSW
Social Worker (Clinical)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (703) 841-1290
GLORIA A OSURUAKA MD
Psychiatry & Neurology (Psychiatry)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (425) 658-2254
MR. AARON TRUITT DAVIDOFF PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (571) 977-6870
TSIGE ALEMU WOLDEMICHAEL
Nurse Practitioner (Psychiatric/Mental Health)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (571) 977-6870
RAFAEL PACHECO
Counselor (Professional)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (301) 263-4595
EDMOND ROSTAND MUSOM NSHEUKO
Nurse Practitioner (Psychiatric/Mental Health)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (571) 977-6870
CATHERINE JARVIS LMSW
Social Worker
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (703) 977-7176
CHIKA AKALUSO
Nurse Practitioner (Psychiatric/Mental Health)
11921 ROCKVILLE PIKE STE 402
ROCKVILLE, MD 20852
Montgomery County (571) 977-6870

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 Antoinette Stewart's NPI number?

The NPI number for Antoinette Stewart is 1215014659. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Antoinette Stewart located?

Antoinette Stewart practices at 11921 Rockville Pike Ste 402, Rockville, MD 20852. The listed phone number is (425) 658-2254.

What is Antoinette Stewart's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.

Is Antoinette Stewart enrolled in Medicare?

Yes. Antoinette Stewart 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 organization bills Medicare for Antoinette Stewart's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Antoinette Stewart reassigns Medicare benefits to Columbia Associates In Psychiatry PC (Arlington, VA). The 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 Antoinette Stewart's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Antoinette Stewart accept?

Health plans from Oscar Health list Antoinette Stewart 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.

When was this NPI record last updated?

The NPPES record for Antoinette Stewart was last updated on July 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.