Helen L. Hammer, MD
Hospitalist Physician · Santa Rosa, CA
Helen L. Hammer, MD is a hospitalist physician with a practice address in Santa Rosa, California, and NPI 1962586933, issued on Oct 25, 2006. Check the license (California G38594, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Helen L. Hammer
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- G38594 CA
Self-reported in NPPES; status is on the state search - Practice location
- 401 Bicentennial Way, Santa Rosa, CA 95403
- Phone
- (707) 571-4000
- Enumerated
- Oct 25, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G385940 CA
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 401 Bicentennial Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Heather Aiello, OTR/LOccupational Therapist1851155022
- Sandra Akrawi, REGISTERED DIETITIANRegistered Dietitian1790821031
- Miguel Alcala, LCSWClinical Social Worker1629857891
Verify Helen L. Hammer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G38594Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Helen L. Hammer among 3,099 hospitalist physician records in California
Helen L. Hammer, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileNo · 90% of these records are
- In the CMS Doctors and Clinicians fileNo · 81% of these records are
- Record last updated2007 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,099 in California → Every provider in Santa Rosa → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Pankaj Arora, MDSanta Rosa, CA 954031033110044
- B. Pamela Burleson, MDSanta Rosa, CA 954031760566830
- Frederick Challoner, MDSanta Rosa, CA 954031043394117
- Margaret Guo, MDSanta Rosa, CA 954031760566764
- Garima Hoffmann, MDSanta Rosa, CA 954031861576837
- Vivek Kumra, MDSanta Rosa, CA 954031972687044
- Deborah Lawson, MDSanta Rosa, CA 954031548332349
- Joseph Matel, M.D.Santa Rosa, CA 954031871792382
Common questions
What is Helen L. Hammer, MD's NPI number?
Helen L. Hammer, MD's National Provider Identifier (NPI) is 1962586933, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Helen L. Hammer, MD located?
The NPPES record lists a practice address at 401 Bicentennial Way, Santa Rosa, CA, 95403. Phone: (707) 571-4000. Providers update this record themselves, so call before visiting.
How can I verify Helen L. Hammer, MD's license?
NPPES lists California license number G38594, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.