Ferrin Katarina Ruiz, MD
Internal Medicine · Pediatric Medicine (CMS) · Montebello, CA
At a glance
833 W Whittier Blvd, Montebello, CA 90640-4735
NPPES record updated Jan 16, 2019. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
833 W Whittier BlvdMontebello, CA 90640-4735
Additional reported practice locations
436 S Riverside AveRialto, CA 923766523
Phone: 9098778868
Fax: 9098770008 403 W F St
Ontario, CA 917623207
Phone: 9099883288
Fax: 9099886767
Education & affiliations
- Medical / professional school
- Yale University School Of Medicine
- Graduation year
- 2013
- CMS specialties
- Internal Medicine · Pediatric Medicine
Practice groups
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $98.09 |
Reporting companies
| Company | Amount |
|---|---|
| GILEAD SCIENCES, INC. | $27.15 |
| MERCK SHARP & DOHME LLC | $19.79 |
| DEXCOM, INC. | $17.95 |
| HOLOGIC SALES AND SERVICE, LLC | $17.73 |
| NOVO NORDISK INC | $15.47 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Internal Medicine · Pediatric Medicine (CMS)
- Taxonomy code
- 174400000X
- Enumeration date
- Apr 30, 2013
- Record updated
- Jan 16, 2019
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
174400000X · Primary
License reported: A132956 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
833 W Whittier BlvdMontebello, CA 90640-4735
- Phone
- (323) 712-4811
- Fax
- (323) 544-6488
Mailing address
833 W WHITTIER BLVDMONTEBELLO, CA 906404735
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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