Quick answers
- Where does Mario Prietto see patients?
- Medicare's clinician data lists 2 practice locations, including Los Angeles, CA. Call before your visit to confirm the address.
- What is Mario Prietto's specialty?
- Medicare lists Clinical Social Worker as the primary specialty.
- Does Mario Prietto accept Medicare assignment?
- Yes. Medicare's clinician data says Mario Prietto accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mario Prietto?
- (323) 541-1600, as listed in official Medicare / NPI Registry data.
- What is Mario Prietto's NPI number?
- 1306025648. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mario Prietto is enrolled with Medicare (CMS data updated 2026-10-02).
- 1321 E 1st StLos Angeles, CA 90033 (323) 541‑1600
- 444 S Mathews StLos Angeles, CA 90033 (323) 541‑1600
Group practices
Medicare enrollment lists Mario Prietto as a member of this group (CMS data updated 2026-10-02).
- St. John's Community Health158 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1306025648 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians