Ralph Hanahan, M.D.
Ralph Hanahan, M.D. holds NPI 1801986641, with a primary taxonomy of therapeutic radiology physician and a practice location in Santa Rosa, CA. The number was issued on October 13, 2006 and the NPPES record was last updated on September 11, 2025. The record lists 2 taxonomy codes.
Taxonomies and licenses
| Taxonomy | Code | License |
|---|---|---|
| Therapeutic Radiology Physician Primary | 2085R0203X | C30500 (CA) |
| Radiation Oncology Physician | 2085R0001X | C30500 (CA) |
Practice location
Local context
Active NPPES records list 2 providers with therapeutic radiology physician as the primary taxonomy within 25 miles of this practice location's ZIP code.
The same primary taxonomy is listed by 31 in California and 311 nationwide.
These are counts from NPPES records, not a ranking or recommendation. Distances are measured between ZIP code centers, not street addresses.
Record history
- Name on record
- Ralph Bailey Hanahan
- Status
- Active
- NPI issued
- Last updated in NPPES
Is this your record? Updates are made through NPPES, the official National Plan and Provider Enumeration System.
NPPES data as of · Source: CMS NPPES
Building software? Fetch this NPI programmatically with the NPILayer Provider API.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://api.npilayer.com/v1/providers/1801986641"