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MICHAEL D MASTERSON, MD, A MEDICAL CORPORATION
NPI 1669671731
Internal Medicine - Medical Oncology in Thousand Oaks, CA

Active since July 17, 2007
227 W JANSS RD, SUITE 280, THOUSAND OAKS, CA 91360(805) 496-1360(805) 496-8270 Get Directions Write a Review

NPPES record last updated: January 18, 2011. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Michael D Masterson, Md, A Medical Corporation NPPES

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

MICHAEL D MASTERSON, MD, A MEDICAL CORPORATION (NPI 1669671731) is a healthcare organization registered as a medical oncology in Thousand Oaks, California and active in the NPI registry since July 2007. The organization lists Jamie Lee Kelly, Practice Manager, as its authorized official.

NPPES Registry Identity

NPI1669671731
Entity TypeOrganization
Primary Taxonomy207RX0202X
Legal Business NameMICHAEL D MASTERSON, MD
Location Address227 W JANSS RD, SUITE 280Thousand Oaks, CA 91360-1848
Mailing Address227 W Janss Rd, Suite 280Thousand Oaks, CA 91360-1848 · (805) 496-1360 · Fax (805) 496-8270
Phone(805) 496-1360
Fax(805) 496-8270
Organization SubpartNo
Authorized OfficialJamie Lee KellyPractice Manager · (805) 496-1360
Enumeration DateJuly 17, 2007
Last NPPES UpdateJanuary 18, 2011
✔ NPI 1669671731 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in CA · G27552
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License G27552 (CA)
227 W JANSS RD, Thousand Oaks, CA 91360
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Other Names 1

Doing Business AsMichael D Masterson, Md, A Medical Corporation

Other Identifiers 3

Medicare PINW22342CA
Medicare UPINW22342CA
OtherG27552CA · Medical License

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Other Providers at the Same Location NPPES 20

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

KELSEY LINDSEY NP
Family Medicine
227 W JANSS RD
THOUSAND OAKS, CA 91360
Ventura County (805) 795-7296
PAUL L. DUDLEY M.D.
Psychiatry & Neurology (Neurology)
227 W JANSS RD, #135
THOUSAND OAKS, CA 91360
Ventura County (805) 373-2890
DR. RICHARD LESSMAN M.D.
Internal Medicine (Nephrology)
227 W JANSS RD, SUITE 110
THOUSAND OAKS, CA 91360
Ventura County (805) 496-6051
CALIFORNIA KIDNEY MEDICAL GROUP INC
Internal Medicine (Nephrology)
227 W JANSS RD, SUITE 110
THOUSAND OAKS, CA 91360
Ventura County (805) 496-6051
JASON CHEN-SHAN LEE M.D.
Radiology (Diagnostic Radiology)
227 W JANSS RD, #150
THOUSAND OAKS, CA 91360
Ventura County (805) 496-7755
DR. MARK E. MERRIMAN M.D.
Anesthesiology
227 W JANSS RD, STE 240
THOUSAND OAKS, CA 91360
Ventura County (805) 371-0455
DR. FRANCOISE GIAO PHUONG MENTEER MD
Internal Medicine
227 W JANSS RD, SUITE 305
THOUSAND OAKS, CA 91360
Ventura County (805) 449-4181
DR. HARRY J COZEN M.D.
Anesthesiology
227 W JANSS RD
THOUSAND OAKS, CA 91360
Ventura County (805) 371-0455

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 Michael D Masterson, MD's NPI number?

The NPI number for Michael D Masterson, MD is 1669671731. It was assigned to this organization in the NPPES registry on July 17, 2007. The provider is doing business as Michael D Masterson, MD, A Medical Corporation.

Where is Michael D Masterson, MD located?

Michael D Masterson, MD is located at 227 W Janss Rd Suite 280, Thousand Oaks, CA 91360. The listed phone number is (805) 496-1360.

What is Michael D Masterson, MD's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

When was this NPI record last updated?

The NPPES record for Michael D Masterson, MD was last updated on January 18, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.