Marissa Ylagan, MD
NPI 1942266051 · Maternal & Fetal Medicine Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Ylagan, MD is a Maternal & Fetal Medicine Physician provider in San Antonio, TX (NPI 1942266051).
Provider details
- NPI number
- 1942266051
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- S0595 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 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 (1)
- 502 Madison Oak Dr Ste 210San Antonio, TX 78258-4192Phone: (210) 481-3000
Registry dates
- Enumerated
- 2006-04-26
- Last updated
- 2023-08-17
- Certified
- 2023-08-17
Frequently asked questions
- What is Marissa Ylagan's NPI number?
- Marissa Ylagan's National Provider Identifier (NPI) is 1942266051, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Ylagan's specialty?
- Marissa Ylagan is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marissa Ylagan located?
- Marissa Ylagan's practice location on file with NPPES is 315 N San Saba Ste 930, San Antonio, TX 78207-3154.
- What is Marissa Ylagan's phone number?
- The practice phone number listed in the NPPES registry for Marissa Ylagan is (210) 704-3200.
- Does Marissa Ylagan accept Medicare?
- Marissa Ylagan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Ylagan's NPI active?
- Yes — Marissa Ylagan's NPI (1942266051) is active in the NPPES registry as of the last update on 2023-08-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.