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MARYSSA L ST. CLAIR FNP-C
NPI 1811878242
Nurse Practitioner in San Antonio, TX

Active since September 11, 2025PECOS EnrolledAccepts Medicare Assignment
22315 WHITE DOE PASS, SAN ANTONIO, TX 78255(361) 800-3679 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Maryssa L St. Clair Fnp-c NPPES

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

MARYSSA L ST. CLAIR FNP-C (NPI 1811878242) is an individual nurse practitioner in San Antonio, Texas, licensed in Texas (1212936) and active in the NPI registry since September 2025. She is enrolled in Medicare PECOS and is a graduate of Texas A & M University System, Hsc, College Of Medicine (2025).

NPPES Registry Identity

NPI1811878242
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameMARYSSA L ST. CLAIRCredential: FNP-C
Location Address22315 WHITE DOE PASSSan Antonio, TX 78255-2410
Mailing Address22315 White Doe PassSan Antonio, TX 78255-2410 · (361) 800-3679
Phone(361) 800-3679
Sole ProprietorNo
Medical School CMSTexas A & M University System, Hsc, College Of MedicineGraduated 2025
Enumeration DateSeptember 11, 2025
NPPES CertifiedAugust 22, 2025
✔ NPI 1811878242 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in TX · 1212936
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Maryssa L St. Clair Fnp-c is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7719463082
PECOS Enrollment IDI20260107002336
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Maryssa St. Clair reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Apexcare PLLC
Hospice and Palliative Medicine
7700 FLOYD CURL DR
San Antonio, TX 78229
  • Reassigned Medicare billing, Texas enrollment
  • 27 clinicians in this Medicare group
NPI 1982216297 (210) 575-4000
Apexmed, PLLC
Internal Medicine
130 SPENCER LN
San Antonio, TX 78201
  • Reassigned Medicare billing, Texas enrollment
  • 27 clinicians in this Medicare group
NPI 1013445519 (210) 737-4544
Apexmed Primary Care Shavano
Internal Medicine
4318 DE ZAVALA RD BLDG 3
San Antonio, TX 78249
  • Reassigned Medicare billing, Texas enrollment
  • 10 clinicians in this Medicare group
NPI 1558166900 (210) 892-0224

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78255 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$84.92 typical visit price
range $54.84 – $166.88
Typical copayment $21.23 (range $13.71 – $41.72)
Most-billed visit code 99203
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Maryssa St. Clair's NPI number?

The NPI number for Maryssa St. Clair is 1811878242. It was assigned to this individual provider in the NPPES registry on September 11, 2025.

Where is Maryssa St. Clair located?

Maryssa St. Clair practices at 22315 White Doe Pass, San Antonio, TX 78255. The listed phone number is (361) 800-3679.

What is Maryssa St. Clair's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Maryssa St. Clair enrolled in Medicare?

Yes. Maryssa St. Clair is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Maryssa St. Clair's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maryssa St. Clair reassigns Medicare benefits to 3 organizations: Apexcare PLLC (San Antonio, TX), Apexmed, PLLC (San Antonio, TX) and Apexmed Primary Care Shavano (San Antonio, TX). Each 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 Maryssa St. Clair's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Maryssa St. Clair accept?

Health plans from Blue Cross and Blue Shield of Texas list Maryssa St. Clair as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Maryssa St. Clair was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.