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DR. ELLEN C KO M.D.
NPI 1124047501
Pathology - Anatomic Pathology & Clinical Pathology in Colton, CA

Active since July 18, 2006PECOS Enrolled
400 N PEPPER AVENUE, ARMC PATHOLOGY, COLTON, CA 92324(909) 580-0010(909) 580-0064 Get Directions Write a Review

NPPES record last updated: March 13, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Ellen C Ko M.d. NPPES

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

DR. ELLEN C KO M.D. (NPI 1124047501) is an individual anatomic pathology & clinical pathology provider in Colton, California, licensed in California (G78277) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1124047501
Entity TypeIndividualFemale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. ELLEN C KOCredential: M.D.
Location Address400 N PEPPER AVENUE, ARMC PATHOLOGYColton, CA 92324
Mailing Address400 N Pepper Avenue, Armc PathologyColton, CA 92324-1819 · (909) 580-0010 · Fax (909) 580-0064
Phone(909) 580-0010
Fax(909) 580-0064
Sole ProprietorNo
Enumeration DateJuly 18, 2006
Last NPPES UpdateMarch 13, 2012
✔ NPI 1124047501 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in CA · G78277
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Also ListedPathology · CytopathologyTaxonomy 207ZC0500X · License G78277 (CA)
400 N PEPPER AVENUE, Colton, CA 92324
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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 (PECOS)

Dr. Ellen C Ko 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 Ellen Ko reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Arrowhead Pathology Medical Group Incorporated
0.2 mi
Anatomic Pathology & Clinical Pathology
400 N. PEPPER AVE.
Colton, CA 92324
  • Reassigned Medicare billing, California enrollment
  • 3 clinicians in this Medicare group
NPI 1508132366 (909) 580-0010

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 92324 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
$136.04 typical visit price
range $59.60 – $179.42
Typical copayment $34.01 (range $14.90 – $44.85)
Most-billed visit code 99204
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

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

MS. MARY M HEYL RN PNP
Pediatrics
400 N PEPPER AVENUE
COLTON, CA 92324
San Bernardino County (909) 580-6315

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 Ellen Ko's NPI number?

The NPI number for Ellen Ko is 1124047501. It was assigned to this individual provider in the NPPES registry on July 18, 2006.

Where is Ellen Ko located?

Ellen Ko practices at 400 N Pepper Avenue Armc Pathology, Colton, CA 92324. The listed phone number is (909) 580-0010.

What is Ellen Ko's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Ellen Ko enrolled in Medicare?

Yes. Ellen Ko is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ellen Ko's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Ko reassigns Medicare benefits to Arrowhead Pathology Medical Group Incorporated (Colton, 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 Ellen Ko'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 Ellen Ko was last updated on March 13, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.