Dr. Frederick A. Klein, M.D.
Gastroenterology (Gastroenterology Physician)
7566 N La Cholla Blvd, Ste A
Tucson, AZ 85741
Who else practices at this address →
Pima County includes primary care (34% of residents) and dental (4% of residents) and mental health (14% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Northwestern University Feinberg Medical School (1980)
- Years since graduation
- 46
- In the NPI registry since
- 2005
- Medicare patients seen, 2024
- 426
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1980Medical school: Northwestern University Feinberg Medical School
- 2005Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Gastroenterology Physician primary
AZ license 11761
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Tucson Medical Center Tucson, AZ
- Northwest Medical Center Tucson, AZ
- Oro Valley Hospital Oro Valley, AZ
Medical groups
- Arizona Gastroenterology LTD (8 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 426
- Services billed
- 805
- Patients’ average age
- 77
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 602 | 373 |
| New patient office or other outpatient visit, 45-59 minutes | 137 | 137 |
| Measurement of hydrogen in breath to test for stomach and bowel symptoms | 79 | 50 |
| Established patient office or other outpatient visit, 20-29 minutes | 57 | 54 |
| New patient office or other outpatient visit, 30-44 minutes | 26 | 26 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Pantoprazole Sodium Other prescribers in Tucson, AZ | 932 |
| Omeprazole Other prescribers in Tucson, AZ | 305 |
| Sucralfate Other prescribers in Tucson, AZ | 223 |
| Dicyclomine Hcl Other prescribers in Tucson, AZ | 97 |
| Sod Sulf-Potass Sulf-Mag Sulf (sodium, potassium,mag sulfates) Other prescribers in Tucson, AZ | 87 |
| Mesalamine Other prescribers in Tucson, AZ | 61 |
| Famotidine Other prescribers in Tucson, AZ | 60 |
| Dexlansoprazole Dr (dexlansoprazole) Other prescribers in Tucson, AZ | 58 |
| Esomeprazole Magnesium Other prescribers in Tucson, AZ | 54 |
| Zenpep (lipase/protease/amylase) Other prescribers in Tucson, AZ | 44 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 14 companies reported 44 payments worth $917 in total to this clinician.
| AbbVie Inc. | $319 |
|---|---|
| Ardelyx, Inc. | $107 |
| Janssen Biotech, Inc. | $99.35 |
| Genzyme Corporation | $63.69 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $57.39 |
| Takeda Pharmaceuticals U.S.A., Inc. | $45.89 |
| Qol Medical, LLC | $45.61 |
| Intercept Pharmaceuticals, Inc. | $36.67 |
| Food and Beverage | $917 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.