David Allen Horwitz, M.D.
Internal Medicine Physician · Scottsdale, AZ
David Allen Horwitz, M.D. is an internal medicine physician with a practice address in Scottsdale, Arizona, and NPI 1942512199, issued on Jul 3, 2010. Check the license (Arizona 46694, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- David Allen Horwitz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 46694 AZ
E-15511 AR
Self-reported in NPPES; status is on the state search - Practice location
- 14633 N 58TH St, Scottsdale, AZ 85254
- Phone
- (650) 785-2545
- Enumerated
- Jul 3, 2010
- Record last updated
- Jun 23, 2022
- Medicare enrollment
- Enrolled (PECOS I20241218001656); accepts Medicare assignment
- Medical or professional school
- St. Louis College Of Physicians And Surgeons, 2010
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Verify David Allen Horwitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 46694Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
102 Medicare Part D claims for 60 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Sulfamethoxazole-Trimethoprim15 claims
- Amoxicillin-Clavulanate Potass11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 4 group practices
- Emergency Staffing Solutions IncSilver City, NM
- Exceptional Physician Group Arizona, PLLCMaricopa, AZ
- Exceptional Physicians Group Yuma Hospital PLLCYuma, AZ
- Southeastern Emergency Physicians LLCWest Memphis, AR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Allen Horwitz among 2,853 internal medicine physician records in Arizona
David Allen Horwitz, M.D. is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 60% of them.
- NPI issued2010 · 60% of these records are older, 38% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2010 · median 2003 among the 1,643 with a school on file
- Record last updated2022 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
344 internal medicine physician records list a practice address in Scottsdale
They are 344 of the 11,008 NPPES records with a practice address in Scottsdale, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Scottsdale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Bierman, M.D.Scottsdale, AZ 852541124023205
- Stephanie Jackson, MDScottsdale, AZ 852541861462509
- Keyvan Koochek, MDScottsdale, AZ 852541902855513
- Mary Ann Lecavalier, MDScottsdale, AZ 852541861497950
- Susan Madsen, M.D.Scottsdale, AZ 852541134216583
- Martin Mollen, MDScottsdale, AZ 852541255384871
- Roxana Orbegoso, M.D.Scottsdale, AZ 852541255326138
- Adrienne Pettit, D.O.Scottsdale, AZ 852541912993445
Common questions
What is David Allen Horwitz, M.D.'s NPI number?
David Allen Horwitz, M.D.'s National Provider Identifier (NPI) is 1942512199, issued on Jul 3, 2010. An NPI identifies a provider in billing; it is not a license.
Where is David Allen Horwitz, M.D. located?
The NPPES record lists a practice address at 14633 N 58TH St, Scottsdale, AZ, 85254. Phone: (650) 785-2545. Providers update this record themselves, so call before visiting.
How can I verify David Allen Horwitz, M.D.'s license?
NPPES lists Arizona license number 46694, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David Allen Horwitz, M.D. prescribe under Medicare Part D?
In 2024, David Allen Horwitz, M.D. had 102 Medicare Part D claims for 60 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.