JAMA Netw Open
CaliforniaFluid TherapyHeart Failure
Dr. Helen L. Hammer, MD
NPI1962586933
- Medicare services, 2019
- 42
- Part D claims, 2020
- 23
- Publications
- 3
- State license
- 1
- Year NPI issued
- 2006
- Practice address
- 401 Bicentennial Way, Santa Rosa, CA 95403-2149
- Practice phone
- Call (707) 571-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Hammer's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Helen L. Hammer is a hospitalist in Santa Rosa, California
Dr. Hammer practices in Santa Rosa, California.
Dr. Hammer's NPI, 1962586933, was assigned on October 25, 2006. Dr. Hammer graduated from WashU Medicine in 1976. Dr. Hammer holds California license G38594.
NPI and contact details
- NPI
- 1962586933NPI Registry (opens in a new tab)
- NPI enumeration date
- October 25, 2006
- NPI status
- Active
- Practice phone
- (707) 571-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Helen L. Hammer's practice address is in Santa Rosa, California
Dr. Hammer's practice address in the NPI Registry is 401 Bicentennial Way, Santa Rosa, CA 95403-2149. The practice phone is (707) 571-4000.
- NPI Registry address401 Bicentennial Way, Santa Rosa, CA 95403-2149Phone(707) 571-4000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Helen L. Hammer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hammer practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Hammer's practice | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Hammer practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Helen L. Hammer is one of 3,186 hospitalists in California
Hospitalist is Dr. Hammer's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Hammer is board certified in internal medicine by the American Board of Internal Medicine. Dr. Hammer is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Hospitalists near Dr. Hammer
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Helen L. Hammer billed Medicare for 42 services in 2019
CMS data shows 42 Medicare services from Dr. Hammer across 2 procedure codes in 2019. Medicare paid $1,984 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201942
Paid by Medicare$1,984
Procedure codes2
Dr. Hammer's Medicare services by type, 2016 to 2019
- 2016
- 2019
- Office and hospital visits
- 2016: 242019: 4275%
Dr. Hammer compared with the California median for hospitalists, 2019
- Dr. Hammer
- California median
- Medicare services
- 42vs 43090% below
- Part D claims
- 23vs 6967% below
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Hammer's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Hammer?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hammer and other hospitalists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Helen L. Hammer wrote 23 Medicare Part D claims in 2020
In 2020, Dr. Hammer wrote 23 Medicare Part D claims. Every claim was for a generic drug. They cover 2 drugs, with $220 in total drug cost. In 2019, CMS named 295 claims across 16 drugs.
Part D claims, 202023
Drugs named by CMS2
Total drug cost$220
Dr. Hammer's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 2952020: 2392%
Drugs named by CMS: 2 in 2020, 16 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Find hospitalists like Dr. Hammer by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Helen L. Hammer has 3 publications on record
Dmand AI links 3 papers to Dr. Hammer, published from 2020 to 2021. 2021 was the busiest year, with 2. Dr. Hammer's most frequent co-authors are Michael Sungwon Yoo, MD, Cheryl E. Green, MD and Colin Thomas Iberti, MD.
Papers3
Years published2020 to 2021
Dr. Hammer's most frequent co-authors
- Michael Sungwon Yoo, MD2 shared papers
- Cheryl E. Green, MD1 shared paper
- Colin Thomas Iberti, MD1 shared paper
Recent publications by Dr. Hammer
Antibodies, Monoclonal, HumanizedAnticoagulantsAntifibrinolytic Agents
See who Dr. Hammer researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hammer works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Helen L. Hammer graduated from WashU Medicine
Dr. Hammer graduated from WashU Medicine in 1976.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Helen L. Hammer's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Helen L. Hammer
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Helen L. Hammer's NPI number?
Dr. Helen L. Hammer's NPI number is 1962586933. It was assigned on October 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Helen L. Hammer?
Dr. Helen L. Hammer is a hospitalist in Santa Rosa, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Helen L. Hammer practice?
Dr. Hammer practices at 401 Bicentennial Way, Santa Rosa, CA 95403-2149.
What is Dr. Helen L. Hammer's office phone number?
The practice phone on file for Dr. Hammer is (707) 571-4000.
What is Dr. Helen L. Hammer's medical license number?
Dr. Hammer holds California license G38594.
Does Dr. Helen L. Hammer accept Medicare?
Yes. CMS data shows Dr. Hammer billed Medicare for 42 services in 2019.
Is Dr. Helen L. Hammer board certified?
Yes. Dr. Hammer is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Helen L. Hammer bill to Medicare?
In 2019, Dr. Hammer's most billed Medicare services were hospital inpatient care (99232) and hospital inpatient care (99231).
Where did Dr. Helen L. Hammer go to medical school?
Dr. Hammer graduated from WashU Medicine in 1976.
What drugs does Dr. Helen L. Hammer prescribe most?
In 2020 Medicare Part D data, Dr. Hammer's most prescribed drugs by claims were Furosemide and Famotidine.
Show 3 more questionsShow fewer questions
How long has Dr. Helen L. Hammer been practicing?
Dr. Hammer graduated from medical school in 1976, 50 years ago.
Does Dr. Helen L. Hammer do research?
Dmand AI links 3 publications to Dr. Hammer, published from 2020 to 2021.
Who does Dr. Helen L. Hammer publish with?
Dr. Hammer's most frequent co-authors are Michael Sungwon Yoo, MD (2 shared papers), Cheryl E. Green, MD (1 shared paper) and Colin Thomas Iberti, MD (1 shared paper).
Selling to hospitalist practices?
See hospitalists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card