Mary Theresa Steinhoff, FNP
Mary Theresa Steinhoff is a Family Nurse Practitioner provider (Nurse Practitioner) practicing in Fallbrook, CA, registered in the NPPES registry with NPI 1538525381 since 2016. The credential FNP stands for Family Nurse Practitioner. Practices at Igor Jercinovich, M.D., Inc. (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1538525381 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mary Theresa Steinhoff |
| Credential | FNP |
| Sex | Female |
| Practice address | 521 E ELDER ST STE 105, Fallbrook, CA, 92028 |
| Phone | 7607288344 |
| Enumeration date | 2016-01-09 |
| Last updated in NPPES | 2020-02-20 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 363LF0000X | Family Nurse Practitioner | Primary | 95003293 | CA |
FNP — Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential
Copy-ready billing details
Provider: Mary Steinhoff, FNP NPI: 1538525381 Taxonomy: 363LF0000X (Family Nurse Practitioner) Address: 521 E ELDER ST STE 105, Fallbrook, CA, 92028
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1033179254 | Brandon Miller | Individual | Family Medicine Physician | Fallbrook, CA |
| 1346437258 | Igor Jercinovich, M.D., Inc. | Organization | Orthopaedic Surgery Physician | Fallbrook, CA |
| 1285814939 | Georgiana Miller | Individual | Family Medicine Physician | Fallbrook, CA |
Verify this record
Cross-check NPI 1538525381 against the authoritative CMS record: view Mary Theresa Steinhoff 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
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2020-02-20.