Doctor profile · Federal record
Dr. David Leff, DO
Gastroenterology Physician (CMS: Gastroenterology) · Mesa, AZ
- NPI 1619956505
- Accepts Medicare
- 35 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3638 E Southern Ave Ste C101
Mesa, AZ 852062563
(480) 564-3763
fax (480) 716-3723
Credentials & registration
- NPI registered
- January 2006 — 20 yrs on file
- Profile last updated
- January 30, 2026
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Arizona #3220
- Medicaid
- AZ #378332
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1619956505. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
807
Distinct HCPCS
10
Medicare allowed
$112,759
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 278 | 188 | $124 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 119 | 119 | $160 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 86 | 51 | $115 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 66 | 63 | $168 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 58 | 58 | $243 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 37 | 36 | $116 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 30 | 28 | $87 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 29 | 29 | $174 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 27 | 27 | $146 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 26 | 26 | $109 |
In context: peer comparison
Among 12 peers in this city , average services per provider: 195. This provider delivers 4.1× the peer median.Open Payments
Industry payments received
All-time total
$68,865
Transactions
191
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| GENZYME CORPORATION | 18 | $22,300.59 | |
| ABBVIE INC. | 61 | $20,696.66 | |
| Regeneron Healthcare Solutions, Inc. | 22 | $15,287.58 | |
| Madrigal Pharmaceuticals | 8 | $3,570.57 | |
| Ardelyx, Inc. | 4 | $2,393.80 | |
| AIMMUNE THERAPEUTICS, INC. | 5 | $1,377.45 | |
| Gilead Sciences, Inc. | 5 | $526.45 | |
| Phathom Pharmaceuticals, Inc. | 13 | $440.54 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 19 | $397.57 | |
| Lilly USA, LLC | 9 | $325.72 | |
| Janssen Biotech, Inc. | 7 | $298.05 | |
| Janssen Scientific Affairs, LLC | 2 | $266.30 | |
| PFIZER INC. | 11 | $192.96 | |
| Ipsen Biopharmaceuticals, Inc | 4 | $191.88 | |
| Celltrion USA Inc. | 3 | $158.69 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
854
Patients
334
Total drug cost
$312,033
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 294 | 95 | $4,175 |
| Omeprazole | Generic | 115 | 45 | $2,157 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 70 | 70 | $12,006 |
| Lansoprazole | Generic | 59 | 16 | $3,262 |
| Linzess (Linaclotide) | Brand | 57 | 22 | $49,762 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 46 | 45 | $776 |
| Dicyclomine Hcl | Generic | 32 | 0 | $748 |
| Dexilant (Dexlansoprazole) | Brand | 27 | 0 | $8,886 |
| Trulance (Plecanatide) | Brand | 26 | 11 | $21,564 |
| Xifaxan (Rifaximin) | Brand | 24 | 0 | $94,004 |
Frequently asked questions
What is Dr. David Leff's medical specialty?
Dr. David Leff practices Gastroenterology Physician in Mesa, AZ.
Where does Dr. David Leff practice?
Dr. David Leff practices at 3638 E Southern Ave Ste C101, Mesa, AZ 852062563. Office phone: 4805643763.
What is Dr. David Leff's NPI?
Dr. David Leff's National Provider Identifier (NPI) is 1619956505, issued by NPPES.
Does Dr. David Leff accept Medicare assignment?
Yes. Dr. David Leff accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. David Leff commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); New patient office or other outpatient visit (HCPCS 99204); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.