J. MICHAEL BRENNAN, M.D., P.A.
NPI 1669661799
Psychiatry & Neurology - Psychiatry in Dallas, TX

Q: What is J. Michael Brennan, M.D., P.A.'s NPI number?

The NPI number for J. Michael Brennan, M.D., P.A. is 1669661799. It was assigned to this organization in the NPPES registry on October 15, 2007.

Q: What is J. Michael Brennan, M.D., P.A.'s specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Active since October 15, 2007

7557 RAMBLER RD STE 565, DALLAS, TX 75231(214) 824-2273(214) 826-9340 Get Directions Write a Review

NPPES record last updated: December 15, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Dec 15, 2025, Dec 8, 2025 (2 updates tracked since 2025).

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About J. Michael Brennan, M.d., P.a. NPPES

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

J. MICHAEL BRENNAN, M.D., P.A. (NPI 1669661799) is a healthcare organization registered as a psychiatry in Dallas, Texas and active in the NPI registry since October 2007. The organization lists Sanjuanita Hatter, Administrative Assistant, as its authorized official.

NPPES Registry Identity

NPI1669661799

Entity TypeOrganization

Primary Taxonomy2084P0800X

Legal Business NameJ. MICHAEL BRENNAN, M.D., P.A.

Location Address7557 RAMBLER RD STE 565Dallas, TX 75231-2373

Mailing Address7557 Rambler Rd Ste 565Dallas, TX 75231-2373 · (214) 824-2273 · Fax (214) 826-9340

Phone(214) 824-2273

Fax(214) 826-9340

Organization SubpartNo

Authorized OfficialSanjuanita HatterAdministrative Assistant · (214) 824-2273

Enumeration DateOctober 15, 2007

Last NPPES UpdateDecember 15, 20252 updates tracked since enumeration

NPPES CertifiedDecember 15, 2025

✔ NPI 1669661799 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in TX · J3750

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

7557 RAMBLER RD STE 565, Dallas, TX 75231

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Other Identifiers 3

Other00T03BTX · Bcbs-tx

Medicaid0359267-01TX

Other4480010TX · Aetna

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

J. Michael Brennan, M.d., P.a. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to J. Michael Brennan, M.D., P.A., which bills Medicare for the services this clinician delivers.

Clinician (1)

John Brennan, M.D, P.A.

Psychiatry

NPI 1336123173

7557 RAMBLER RD STE 565
Dallas, TX 75231

(214) 824-2273

✔ PECOS✔ Accepts MedicareSame address

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

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 J. Michael Brennan, M.D., P.A.'s NPI number?

The NPI number for J. Michael Brennan, M.D., P.A. is 1669661799. It was assigned to this organization in the NPPES registry on October 15, 2007.

Where is J. Michael Brennan, M.D., P.A. located?

J. Michael Brennan, M.D., P.A. is located at 7557 Rambler Rd Ste 565, Dallas, TX 75231. The listed phone number is (214) 824-2273.

What is J. Michael Brennan, M.D., P.A.'s specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is J. Michael Brennan, M.D., P.A. enrolled in Medicare?

Yes. J. Michael Brennan, M.D., P.A. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through J. Michael Brennan, M.D., P.A.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Psychiatry) reassigns their Medicare billing to J. Michael Brennan, M.D., P.A.. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for J. Michael Brennan, M.D., P.A. was last updated on December 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.