SOUTH COUNTY HEMATOLOGY ONCOLOGY, INC.
NPI 1326124819
Internal Medicine - Hematology & Oncology in Chula Vista, CA

Q: What is Marilyn S. Norton M.D., Inc.'s NPI number?

The NPI number for Marilyn S. Norton M.D., Inc. is 1326124819. It was assigned to this organization in the NPPES registry on October 27, 2006. The provider is doing business as South County Hematology Oncology, Inc..

Q: What is Marilyn S. Norton M.D., Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Active since October 27, 2006CLIA 05D1009444 · Certificate of Compliance

769 MEDICAL CENTER CT STE 202, CHULA VISTA, CA 91911(619) 482-8430(619) 482-8005 Get Directions Write a Review

NPPES record last updated: September 17, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About South County Hematology Oncology, Inc. NPPES

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

SOUTH COUNTY HEMATOLOGY ONCOLOGY, INC. (NPI 1326124819) is a healthcare organization registered as a hematology & oncology in Chula Vista, California and active in the NPI registry since October 2006. The organization holds a CLIA Certificate of Compliance certificate valid through December 22, 2027 and lists Marilyn Sandra Norton, Md./president, as its authorized official.

NPPES Registry Identity

NPI1326124819

Entity TypeOrganization

Primary Taxonomy207RH0003X

Legal Business NameMARILYN S. NORTON M.D., INC.

Location Address769 MEDICAL CENTER CT STE 202Chula Vista, CA 91911-6660

Mailing Address769 Medical Center Ct Ste 202Chula Vista, CA 91911-6660 · (619) 482-8430 · Fax (619) 482-8005

Phone(619) 482-8430

Fax(619) 482-8005

Organization SubpartNo

Authorized OfficialMarilyn Sandra NortonMd./president · (619) 482-8430

Enumeration DateOctober 27, 2006

Last NPPES UpdateSeptember 17, 2012

✔ NPI 1326124819 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

769 MEDICAL CENTER CT STE 202, Chula Vista, CA 91911

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Other Names 1

Doing Business AsSouth County Hematology Oncology, Inc.

Other Identifiers 2

MedicaidGR0100450CA

Medicare ID-Type UnspecifiedW17949CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Avera Health Plans, Baylor Scott and White Health Plan and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

South County Hematology Oncology, Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to South County Hematology Oncology, Inc., which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Kenneth Johnson, MD

Hematology

NPI 1063527711

769 MEDICAL CENTER CT SUITE 202
Chula Vista, CA 91911

(619) 482-8430

✔ PECOS✔ Accepts MedicareSame address

Marilyn Norton, MD

Hematology/Oncology

NPI 1417060054

769 MEDICAL CENTER CT SUITE 202
Chula Vista, CA 91911

(619) 482-8430

✔ PECOS✔ Accepts Medicare0.1 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 05D1009444

South County Hematology Oncology · Chula Vista, CA

Active · expires Dec 22, 2027

CLIA Number05D1009444

Laboratory TypePhysician Office

Certificate Effective DateDecember 23, 2025

Certificate Expiration DateDecember 22, 2027

Laboratory DirectorMarilyn S. Norton

Laboratory Phone(619) 482-8430

Laboratory LocationSouth County Hematology Oncology769 Medical Center Ct Ste 202, Chula Vista, CA 91911

CLIA data matches this NPI record on: Address Name Phone

This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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 Marilyn S. Norton M.D., Inc.'s NPI number?

The NPI number for Marilyn S. Norton M.D., Inc. is 1326124819. It was assigned to this organization in the NPPES registry on October 27, 2006. The provider is doing business as South County Hematology Oncology, Inc..

Where is Marilyn S. Norton M.D., Inc. located?

Marilyn S. Norton M.D., Inc. is located at 769 Medical Center Ct Ste 202, Chula Vista, CA 91911. The listed phone number is (619) 482-8430.

What is Marilyn S. Norton M.D., Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Marilyn S. Norton M.D., Inc. enrolled in Medicare?

Yes. Marilyn S. Norton M.D., Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Marilyn S. Norton M.D., Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Marilyn S. Norton M.D., Inc., in Hematology and Hematology/Oncology. A 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 the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Marilyn S. Norton M.D., Inc. hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 05D1009444) is associated with this NPI, valid through December 22, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Marilyn S. Norton M.D., Inc. accept?

Health plans from Anthem Blue Cross and Blue Shield, Avera Health Plans, Baylor Scott and White Health Plan, Blue Cross Blue Shield of North Dakota and Blue Cross Blue Shield of Wyoming and 15 other insurers list Marilyn S. Norton M.D., Inc. as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Marilyn S. Norton M.D., Inc. was last updated on September 17, 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.