What is Brendan O'Brien's NPI number?

Brendan O'Brien's National Provider Identifier (NPI) is 1598073181, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Brendan O'Brien's specialty?

Brendan O'Brien is listed in the NPPES registry with a primary specialty of Trauma Surgery Physician (Allopathic & Osteopathic Physicians).

Where is Brendan O'Brien located?

Brendan O'Brien's practice location on file with NPPES is 3551 Roger Brooke Dr, San Antonio, TX 78234-4504.

What is Brendan O'Brien's phone number?

The practice phone number listed in the NPPES registry for Brendan O'Brien is (210) 539-9582.

Does Brendan O'Brien accept Medicare?

Brendan O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Brendan O'Brien's NPI active?

Yes — Brendan O'Brien's NPI (1598073181) is active in the NPPES registry as of the last update on 2025-12-08.

IndividualActiveAccepts Medicare

Brendan O'Brien, M.D.

NPI 1598073181 · Trauma Surgery Physician · San Antonio, TX

Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Brendan O'Brien, M.D. is a Trauma Surgery Physician provider in San Antonio, TX (NPI 1598073181).

Provider details

NPI number: 1598073181
Entity type: Individual
Primary specialty: Trauma Surgery PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: Yes
License: T9464 (TX)

Specialties & taxonomies

Trauma Surgery PhysicianPrimary2086S0127XLicense T9464 (TX)
Allopathic & Osteopathic Physicians
Surgery Physician208600000XLicense 0101251259 (VA)
Allopathic & Osteopathic Physicians
Surgical Critical Care Physician2086S0102XLicense ME146116 (FL)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(92/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
15 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
3 documented practice locations

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

3551 Roger Brooke Dr

San Antonio, TX 78234-4504

Phone: (210) 539-9582

Street-level locationGet directions

More TX providers

Mailing address

8901 Wisconsin Ave

Bethesda, MD 20889-0004

Additional practice locations (2)

1887 Kingsley Ave Ste 1900
Orange Park, FL 32073-4451
Phone: (904) 276-2549
Fax: (904) 276-9235
1 Boone Rd
Bremerton, WA 98312-1894
Phone: (360) 475-4916

Enumerated: 2010-09-17
Last updated: 2025-12-08
Certified: 2025-12-08

Frequently asked questions

What is Brendan O'Brien's NPI number?: Brendan O'Brien's National Provider Identifier (NPI) is 1598073181, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Brendan O'Brien's specialty?: Brendan O'Brien is listed in the NPPES registry with a primary specialty of Trauma Surgery Physician (Allopathic & Osteopathic Physicians).
Where is Brendan O'Brien located?: Brendan O'Brien's practice location on file with NPPES is 3551 Roger Brooke Dr, San Antonio, TX 78234-4504.
What is Brendan O'Brien's phone number?: The practice phone number listed in the NPPES registry for Brendan O'Brien is (210) 539-9582.
Does Brendan O'Brien accept Medicare?: Brendan O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Brendan O'Brien's NPI active?: Yes — Brendan O'Brien's NPI (1598073181) is active in the NPPES registry as of the last update on 2025-12-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.