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KAREN KAY GRAGASIN ALFONSO M.D.
NPI 1316228729
Pediatrics in Chino Hills, CA

Active since August 30, 2011PECOS EnrolledAccepts Medicare Assignment
15855 POMONA RINCON RD, CHINO HILLS, CA 91709(909) 929-2511 Get Directions Write a Review

NPPES record last updated: November 20, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 20, 2024, Aug 28, 2017 (2 updates tracked since 2017).

About Karen Kay Gragasin Alfonso M.d. NPPES

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

KAREN KAY GRAGASIN ALFONSO M.D. (NPI 1316228729) is an individual pediatrics provider in Chino Hills, California, licensed in California (A119750) and active in the NPI registry since August 2011. She is enrolled in Medicare PECOS and is a graduate of Other (2013).

NPPES Registry Identity

NPI1316228729
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameKAREN KAY GRAGASIN ALFONSOCredential: M.D.
Location Address15855 POMONA RINCON RDChino Hills, CA 91709-5572
Mailing Address15855 Pomona Rincon RdChino Hills, CA 91709-5572 · (909) 929-2511
Phone(909) 929-2511
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateAugust 30, 2011
Last NPPES UpdateNovember 20, 20242 updates tracked since enumeration
NPPES CertifiedNovember 20, 2024
✔ NPI 1316228729 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · A119750
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.
15855 POMONA RINCON RD, Chino Hills, CA 91709
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Karen Kay Gragasin Alfonso M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9638319056
PECOS Enrollment IDI20130709000183
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 Reassignments

2

Medicare enrollment records show Karen Kay Alfonso reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Providence Medical Foundation
8.8 mi
General Practice
1514 VALLEY VISTA DR
Diamond Bar, CA 91765
  • Reassigned Medicare billing, California enrollment
  • 1,699 clinicians in this Medicare group
NPI 1285890624 (909) 860-1144
Memorialcare Medical Foundation
23 mi
Clinic/Center
17360 BROOKHURST ST
Fountain Valley, CA 92708
  • Reassigned Medicare billing, California enrollment
  • 948 clinicians in this Medicare group
NPI 1205167350 (877) 696-3622

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 91709 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
$91.88 typical visit price
range $59.60 – $179.42
Typical copayment $22.97 (range $14.90 – $44.85)
Most-billed visit code 99203
Established Patient
$104.64 typical visit price
range $19.37 – $146.42
Typical copayment $26.16 (range $4.84 – $36.60)
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 5

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

LISA YOENSIL YOON PARK FNP-C
Nurse Practitioner (Family)
15855 POMONA RINCON RD
CHINO HILLS, CA 91709
San Bernardino County (909) 264-8666
CRISTIAN GONZALEZ LCSW
Social Worker
15855 POMONA RINCON RD
CHINO HILLS, CA 91709
San Bernardino County (909) 929-2511
CARRIE ANNA JOHNSON LMFT
Marriage & Family Therapist
15855 POMONA RINCON RD
CHINO HILLS, CA 91709
San Bernardino County (909) 401-2259
MATTHEW RIKIO MURAYAMA DO
Family Medicine
15855 POMONA RINCON RD
CHINO HILLS, CA 91709
San Bernardino County (909) 929-2513
PAMELA ESTRADA HIGA MD
Obstetrics & Gynecology
15855 POMONA RINCON RD
CHINO HILLS, CA 91709
San Bernardino County (909) 929-2513

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 Karen Kay Alfonso's NPI number?

The NPI number for Karen Kay Alfonso is 1316228729. It was assigned to this individual provider in the NPPES registry on August 30, 2011.

Where is Karen Kay Alfonso located?

Karen Kay Alfonso practices at 15855 Pomona Rincon Rd, Chino Hills, CA 91709. The listed phone number is (909) 929-2511.

What is Karen Kay Alfonso's specialty?

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

Is Karen Kay Alfonso enrolled in Medicare?

Yes. Karen Kay Alfonso is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Karen Kay Alfonso's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Karen Kay Alfonso reassigns Medicare benefits to 2 organizations: Providence Medical Foundation (Diamond Bar, CA) and Memorialcare Medical Foundation (Fountain Valley, CA). Each 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 Karen Kay Alfonso'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 Karen Kay Alfonso was last updated on November 20, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 months 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.