Giancarlo Diaz, MD
NPI 1538740394 · Anesthesiology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Giancarlo Diaz, MD is a Anesthesiology Physician provider in San Antonio, TX (NPI 1538740394).
Provider details
- NPI number
- 1538740394
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- W1774 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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
Mailing address
Additional practice locations (2)
- 5106 W Loop 1604 NSan Antonio, TX 78251-4408Phone: (726) 243-2000
- 1310 Mccullough AveSan Antonio, TX 78212-5601Phone: (210) 757-2200
Registry dates
- Enumerated
- 2021-04-14
- Last updated
- 2026-03-04
- Certified
- 2026-03-04
Frequently asked questions
- What is Giancarlo Diaz's NPI number?
- Giancarlo Diaz's National Provider Identifier (NPI) is 1538740394, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Giancarlo Diaz's specialty?
- Giancarlo Diaz is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Giancarlo Diaz located?
- Giancarlo Diaz's practice location on file with NPPES is 4502 Medical Dr, San Antonio, TX 78229-4492.
- What is Giancarlo Diaz's phone number?
- The practice phone number listed in the NPPES registry for Giancarlo Diaz is (210) 358-4000.
- Does Giancarlo Diaz accept Medicare?
- Giancarlo Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Giancarlo Diaz's NPI active?
- Yes — Giancarlo Diaz's NPI (1538740394) is active in the NPPES registry as of the last update on 2026-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.