1. Home
  2. Directory
  3. California
  4. Downey
  5. Pediatrics
  6. NPI Profile

DR. JOSEPH CHARLES MARES M.D.
NPI 1316186323
Pediatrics in Downey, CA

Active since February 13, 2009PECOS Enrolled
9449 IMPERIAL HWY STE 332, DOWNEY, CA 90242(562) 657-2141 Get Directions Write a Review

NPPES record last updated: December 15, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Joseph Charles Mares M.d. NPPES

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

DR. JOSEPH CHARLES MARES M.D. (NPI 1316186323) is an individual pediatrics provider in Downey, California, licensed in California (A106615) and active in the NPI registry since February 2009. He is enrolled in Medicare PECOS and maintains a secondary practice location in Los Angeles.

NPPES Registry Identity

NPI1316186323
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameDR. JOSEPH CHARLES MARESCredential: M.D.
Location Address9449 IMPERIAL HWY STE 332Downey, CA 90242-2814
Mailing Address9449 Imperial Hwy Ste 332Downey, CA 90242-2814 · (562) 657-2141
Phone(562) 657-2141
Sole ProprietorNo
Enumeration DateFebruary 13, 2009
Last NPPES UpdateDecember 15, 2021
NPPES CertifiedSeptember 11, 2021
✔ NPI 1316186323 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · A106615
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
9449 IMPERIAL HWY STE 332, Downey, CA 90242
Open in Google Maps ↗

Secondary Practice Location 1

Location 14650 W Sunset Blvd, MS#68Los Angeles, CA 90027-6062 · Phone (310) 910-5300

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Joseph Charles Mares M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Joseph Mares reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
1.1 mi
Health Maintenance Organization
9400 ROSECRANS AVE
Bellflower, CA 90706
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1396287082 (California)
  • 13,921 clinicians in this Medicare group
NPI 1043242555 (562) 461-3000

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 90242 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DIANE ELIZABETH BATHAM CPNP-PC
Nurse Practitioner (Pediatrics)
9449 IMPERIAL HWY STE 332
DOWNEY, CA 90242
Los Angeles County (626) 572-9385

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 Joseph Mares's NPI number?

The NPI number for Joseph Mares is 1316186323. It was assigned to this individual provider in the NPPES registry on February 13, 2009.

Where is Joseph Mares located?

Joseph Mares practices at 9449 Imperial Hwy Ste 332, Downey, CA 90242. The listed phone number is (562) 657-2141.

What is Joseph Mares's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Joseph Mares enrolled in Medicare?

Yes. Joseph Mares is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Joseph Mares's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Mares reassigns Medicare benefits to Southern California Permanente Medical Group (Bellflower, CA). The 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 Joseph Mares's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Joseph Mares was last updated on December 15, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.