John Isaac, M.B.B.S
NPI 1427001890 · Neonatal-Perinatal Medicine Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Isaac, M.B.B.S is a Neonatal-Perinatal Medicine Physician provider in San Antonio, TX (NPI 1427001890).
Provider details
- NPI number
- 1427001890
- Entity type
- Individual
- Primary specialty
- Neonatal-Perinatal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.B.B.S
- Sex
- Male
- Sole proprietor
- No
- License
- K 6013 (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
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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
Registry dates
- Enumerated
- 2006-05-18
- Last updated
- 2021-11-24
- Certified
- 2021-11-24
Frequently asked questions
- What is John Isaac's NPI number?
- John Isaac's National Provider Identifier (NPI) is 1427001890, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Isaac's specialty?
- John Isaac is listed in the NPPES registry with a primary specialty of Neonatal-Perinatal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Isaac located?
- John Isaac's practice location on file with NPPES is 5430 Fredericksburg Rd, San Antonio, TX 78229-3539.
- What is John Isaac's phone number?
- The practice phone number listed in the NPPES registry for John Isaac is (210) 541-8281.
- Does John Isaac accept Medicare?
- John Isaac is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Isaac's NPI active?
- Yes — John Isaac's NPI (1427001890) is active in the NPPES registry as of the last update on 2021-11-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.