Marcelyn Opal Billy
Marcelyn Opal Billy is a Social Worker provider (Social Worker) practicing in Oceanside, CA, registered in the NPPES registry with NPI 1538840939 since 2023. Practices at Milestone House (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1538840939 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Marcelyn Opal Billy |
| Sex | Female |
| Practice address | Oceanside, CA, 92054 |
| Phone | 7604336361 |
| Enumeration date | 2023-07-27 |
| Last updated in NPPES | 2025-10-15 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 104100000X | Social Worker | Primary | ASW110331 | CA |
Copy-ready billing details
Provider: Marcelyn Billy NPI: 1538840939 Taxonomy: 104100000X (Social Worker) Address: Oceanside, CA, 92054
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1538554530 | Tina Jaworski | Individual | Clinical Social Worker | Oceanside, CA |
| 1609256403 | Felisha Hampton | Individual | Rehabilitation Practitioner | Oceanside, CA |
| 1568094084 | Milestone House | Organization | Adolescent and Children Mental Health Clinic/Center | Oceanside, CA |
| 1598378010 | Joely Wiggins | Individual | Marriage & Family Therapist | Oceanside, CA |
| 1063009884 | Beverly Boone | Individual | Mental Health Counselor | Oceanside, CA |
| 1639755986 | Kayleigh Cole | Individual | Rehabilitation Practitioner | Oceanside, CA |
| 1497335038 | Kelly Lyles | Individual | Social Worker | Oceanside, CA |
| 1700450269 | Michelle Zambrana | Individual | Case Manager/Care Coordinator | Oceanside, CA |
Verify this record
Cross-check NPI 1538840939 against the authoritative CMS record: view Marcelyn Opal Billy on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Where does Marcelyn Billy practice?
What is the NPI number for Marcelyn Billy?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2025-10-15.