Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Shirish A Mahajan, MD

Hematology & Oncology Physician in Redding, CA · enumerated 2006.

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

National Provider Identifier

1609808856

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Registry record

Entity type Individual (Type 1)

Name Shirish A Mahajan

Credential MD

Sex Male

Practice address 310 Hartnell Ave, Redding, CA, 96002

Phone (530) 244-2223

Fax (530) 244-4799

Enumeration date Jul 7, 2006

Last updated in NPPES Nov 14, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 001999 (NY) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 001999 (NY) Primary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License A105218 (CA) Secondary

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
P00123926	Other	NY	RAILROAD MEDICARE
GR0054240	Medicaid	CA	-
1629237011	Medicaid	CA	-

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 Shirish Mahajan's NPI record?

Cross-check NPI 1609808856 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1609808856 active?

Yes, as of the latest NPPES snapshot, NPI 1609808856 is active (record last updated 2008-11-14).

Other providers at this practice address

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Vicki Philben Surgical Oncology Physician · Redding, CA NPI 1033180682 Michael Figueroa Medical Oncology Physician · Redding, CA NPI 1558316042 Carolyn Collins Medical Oncology Physician · Redding, CA NPI 1356380554 Sharon Pereira-Matsumoto Radiation Oncology Physician · Redding, CA NPI 1427070671 Dyanesh Bapu Ravindran Hematology & Oncology Physician · Redding, CA NPI 1659387132 Judith Neilio Family Nurse Practitioner · Redding, CA NPI 1518065770 Brandon Penn Internal Medicine Physician · Redding, CA NPI 1295919504 Cancer Care Plus Specialist · Redding, CA NPI 1629237011

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-14.