Michael D Masterson, MD
NPI 1669671731 · Medical Oncology Physician · Thousand Oaks, CA
Michael D Masterson, MD is a Medical Oncology Physician organization in Thousand Oaks, CA (NPI 1669671731).
Provider details
- NPI number
- 1669671731
- Entity type
- Organization
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Jamie Kelly, Practice Manager(805) 496-1360
- License
- G27552 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Michael D Masterson, MD, a Medical Corporation
Registry dates
- Enumerated
- 2007-07-17
- Last updated
- 2011-01-18
Frequently asked questions
- What is Michael D Masterson, MD's NPI number?
- Michael D Masterson, MD's National Provider Identifier (NPI) is 1669671731, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Michael D Masterson, MD?
- Michael D Masterson, MD is classified in the NPPES registry as Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael D Masterson, MD located?
- Michael D Masterson, MD's practice location on file with NPPES is 227 W Janss Rd, Thousand Oaks, CA 91360-1848.
- What is Michael D Masterson, MD's phone number?
- The practice phone number listed in the NPPES registry for Michael D Masterson, MD is (805) 496-1360.
- Who is the authorized official for Michael D Masterson, MD?
- The authorized official listed on Michael D Masterson, MD's NPPES record is Jamie Kelly, Practice Manager. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Michael D Masterson, MD's NPI active?
- Yes — Michael D Masterson, MD's NPI (1669671731) is active in the NPPES registry as of the last update on 2011-01-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.