Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Howard Wayne Fellows, M.D.

Hematology & Oncology Physician in Downey, CA · enumerated 2005 · practices at The Oncology Institute Ca, A Professional Corporation.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1659365526

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Registry record

Entity type Individual (Type 1)

Name Dr. Howard Wayne Fellows

Credential M.D.

Sex Male

Practice address Downey, CA, 90241

Phone (562) 869-1201

Fax (562) 869-1281

Enumeration date Sep 7, 2005

Last updated in NPPES Jul 21, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 39213 (IA) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License G88376 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1659365526	Medicaid	IA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Howard Fellows's NPI record?

Cross-check NPI 1659365526 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1659365526 active?

Yes, as of the latest NPPES snapshot, NPI 1659365526 is active (record last updated 2022-07-21).

Other providers at this practice address

Browse all →

Amitabha Mazumder Hematology & Oncology Physician · Downey, CA NPI 1881682318 Soo Chung Hematology & Oncology Physician · Downey, CA NPI 1245293729 Balaganesh Gopurala Hematology & Oncology Physician · Downey, CA NPI 1316967854 Haydee Gonzalez Hidalgo Hematology & Oncology Physician · Downey, CA NPI 1912071481 Natasha Salazar Physician Assistant · Downey, CA NPI 1215401674 Andrea Cuadras Acute Care Nurse Practitioner · Downey, CA NPI 1750984746 The Oncology Institute Ca, A Professional Corporation Hematology & Oncology Physician · Downey, CA NPI 1982349478

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.