Dr. David Horwitz, MD
- Part D claims, 2024
- 97
- Publications
- 3
- Industry payments
- $338
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 1520 San Pablo St, Los Angeles, CA 90033-5310
- Practice phone
- Call (626) 457-5839
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Usc Internal Medicine
Multi-specialty group site · Los Angeles, California
Find Dr. Horwitz'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. David Horwitz is a rheumatologist in Los Angeles, California
Dr. Horwitz practices at Usc Internal Medicine in Los Angeles, California.
Dr. Horwitz's NPI, 1457389918, was assigned on June 30, 2006. Dr. Horwitz graduated from Pritzker School of Medicine in 1962. Dr. Horwitz holds California license G43389.
- NPI
- 1457389918NPI Registry (opens in a new tab)
- NPI enumeration date
- June 30, 2006
- NPI status
- Active
- Practice phone
- (626) 457-5839
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Medical school graduation
- 1962
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David Horwitz practices at Usc Internal Medicine in Los Angeles, California
Dr. Horwitz's primary practice is Usc Internal Medicine, at 1520 San Pablo St, Los Angeles, CA 90033-5310. The practice phone is (626) 457-5839.
- Usc Internal Medicine1520 San Pablo St, Los Angeles, CA 90033-5310Phone(626) 457-5839
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David Horwitz is affiliated with 1 site of care and 1 medical group
Dr. Horwitz's primary practice is Usc Internal Medicine in Los Angeles, California. Dmand AI also links Dr. Horwitz to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. David Horwitz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Horwitz practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Usc Internal Medicine | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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. David Horwitz is one of 821 rheumatologists in California
Rheumatology is Dr. Horwitz's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Horwitz is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Horwitz's licenses on file in 3 states: California, Illinois and Nevada.
Specialties and state licenses
- Rheumatology, CaliforniaPrimary
- Illinois license
- Nevada license
Rheumatologists near Dr. Horwitz
Counts of rheumatologists 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. David Horwitz wrote 97 Medicare Part D claims in 2024
In 2024, Dr. Horwitz wrote 97 Medicare Part D claims for 13 patients. 65% of them were for generic drugs.
Dr. Horwitz's Part D claims by kind of drug, 2024
- Generic63 claims65%
- Brand-name34 claims35%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. David Horwitz has 3 publications on record
Dmand AI links 3 papers to Dr. Horwitz.
Recent publications by Dr. Horwitz
See who Dr. Horwitz researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Horwitz works with, so you can find a warm path to the right rheumatologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. David Horwitz received $338 in industry payments from 2017 to 2018
CMS Open Payments shows 3 general payments to Dr. Horwitz from 3 drug and device companies from 2017 to 2018. Food and beverage make up the largest share, 100% of the total. Celgene Corporation paid the most, $125.
General payments to Dr. Horwitz by program year, 2017 to 2018
Companies that paid Dr. Horwitz the most, 2017 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David Horwitz has 1 award and honors on record
Dmand AI lists 1 award for Dr. Horwitz, most recently ASCI Member in 1978.
Awards and honors for Dr. Horwitz
- 1978
- ASCI Member
Source: Dmand AI Professional Profile Data
Dr. David Horwitz graduated from Pritzker School of Medicine
Dr. Horwitz graduated from Pritzker School of Medicine in 1962. Dr. Horwitz is a member of ACR.
- Medical school
- Board certified in internal medicine
- Board certified in rheumatology
Source: Dmand AI Professional Profile Data
Sources for Dr. David Horwitz'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 | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. David Horwitz
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. David Horwitz's NPI number?
Dr. David Horwitz's NPI number is 1457389918. It was assigned on June 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. David Horwitz?
Dr. David Horwitz is a rheumatologist in Los Angeles, California. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. David Horwitz practice?
Dr. Horwitz practices at 1520 San Pablo St, Los Angeles, CA 90033-5310. Dr. Horwitz's primary practice is Usc Internal Medicine in Los Angeles, California. Dmand AI also links Dr. Horwitz to 1 medical group.
What is Dr. David Horwitz's office phone number?
The practice phone on file for Dr. Horwitz is (626) 457-5839.
What is Dr. David Horwitz's medical license number?
Dr. Horwitz holds California license G43389, one of the licenses on file in 3 states.
Which states has Dr. David Horwitz been licensed in?
Dmand AI has state licenses on file for Dr. Horwitz in California (1980 to 2026), Illinois (since 1963) and Nevada (2014 to 2017).
Is Dr. David Horwitz board certified?
Yes. Dr. Horwitz is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. David Horwitz go to medical school?
Dr. Horwitz graduated from Pritzker School of Medicine in 1962.
Has Dr. David Horwitz received payments from drug or device companies?
CMS Open Payments shows $338 in general payments to Dr. Horwitz from 3 companies from 2017 to 2018. The largest total came from Celgene Corporation.
How long has Dr. David Horwitz been practicing?
Dr. Horwitz graduated from medical school in 1962, 64 years ago.
Does Dr. David Horwitz do research?
Dmand AI links 3 publications to Dr. Horwitz.
Selling to rheumatology practices?
See rheumatologists 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