David B. Leff, DO
Gastroenterology Physician · Mesa, AZ
David B. Leff, DO is a gastroenterology physician with a practice address in Mesa, Arizona, and NPI 1619956505, issued on Jan 10, 2006. Check the license (Arizona 3220, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- David B. Leff
- Credential
- DO
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 3220 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 3638 E Southern Ave Ste C101, Mesa, AZ 85206
- Phone
- (480) 564-3763
- Enumerated
- Jan 10, 2006
- Record last updated
- Jan 30, 2026
- Fax
- (480) 716-3723
- Medicaid ID
- 378332 AZ
- Medicare enrollment
- Enrolled (PECOS I20120224000200); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 403 in Arizona → Look up another NPI →
Also registered at 3638 E Southern Ave Ste C101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sara Ancello, D.O.Gastroenterology Physician1720420557
- Kelly Matthews, NPFamily Nurse Practitioner1861941619
- David Tessler, DOGastroenterology Physician1659359883
Verify David B. Leff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 3220Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
52% more Medicare Part D claims than the average gastroenterology physician in 2024
1,235 Medicare Part D claims for 487 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims.
Most prescribed
- Pantoprazole Sodium312 claims
- Sod Sulf-Potass Sulf-Mag Sulf118 claims
- Linzess89 claims
- Omeprazole82 claims
- Lansoprazole51 claims
- Gavilyte-G42 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.
Industry payments in 2024: $68,865.10
202 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Arizona Gastrointestinal Associates PLCScottsdale, AZ
- Central Arizona Medical Associates PCMesa, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David B. Leff among 403 gastroenterology physician records in Arizona
David B. Leff, DO is one of 403 gastroenterology physician records with a practice address in Arizona. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 41% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1991 · median 2001 among the 295 with a school on file
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Arizona
There are 403 gastroenterology physician records in Arizona.
All 403 in Arizona → Every provider in Mesa → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Doo-Sang Cho, M.D.Mesa, AZ 852061750376778
- Andrew Collins, M.D.Mesa, AZ 852061740275338
- Steven Kaiser, MDMesa, AZ 852061346219433
- Prem Kumar, MDMesa, AZ 852061700841350
- Shahbaz Qureshi, MDMesa, AZ 852061548370109
- Sudhakar Reddy, MDMesa, AZ 852061063458735
- Michael Seip, DOMesa, AZ 852061205815925
- Craig Stein, M.D.Mesa, AZ 852061861487456
Common questions
What is David B. Leff, DO's NPI number?
David B. Leff, DO's National Provider Identifier (NPI) is 1619956505, issued on Jan 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David B. Leff, DO located?
The NPPES record lists a practice address at 3638 E Southern Ave Ste C101, Mesa, AZ, 85206. Phone: (480) 564-3763. Providers update this record themselves, so call before visiting.
How can I verify David B. Leff, DO's license?
NPPES lists Arizona license number 3220, 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 B. Leff, DO prescribe under Medicare Part D?
In 2024, David B. Leff, DO had 1,235 Medicare Part D claims for 487 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.