IndividualActive
Mark Rounsaville, MD
NPI 1033100284 · Radiation Oncology Physician · Nicasio, CA
Mark Rounsaville, MD is a Radiation Oncology Physician provider in Nicasio, CA (NPI 1033100284).
Provider details
- NPI number
- 1033100284
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A39060 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
45 Los Pinos
Nicasio, CA 94946
Phone: (415) 662-2669
Fax: (415) 662-2669
Street-level locationGet directions
Mailing address
45 Los Pinos
Nicasio, CA 94946
Registry dates
- Enumerated
- 2005-11-04
- Last updated
- 2022-05-17
- Certified
- 2022-05-17
Frequently asked questions
- What is Mark Rounsaville's NPI number?
- Mark Rounsaville's National Provider Identifier (NPI) is 1033100284, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Rounsaville's specialty?
- Mark Rounsaville is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Rounsaville located?
- Mark Rounsaville's practice location on file with NPPES is 45 Los Pinos, Nicasio, CA 94946.
- What is Mark Rounsaville's phone number?
- The practice phone number listed in the NPPES registry for Mark Rounsaville is (415) 662-2669.
- Is Mark Rounsaville's NPI active?
- Yes — Mark Rounsaville's NPI (1033100284) is active in the NPPES registry as of the last update on 2022-05-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.