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Dr. Frederick A. Klein, MD
NPI1962487876PAC ID6406832146
- Medicare services, 2024
- 785
- Medicare patients, 2024
- 426
- Part D claims, 2024
- 2,432
- Publications
- 4
- MIPS score, 2024
- 22
- Practice address
- 7566 N La Cholla Blvd, Tucson, AZ 85741
- Practice phone
- Call (520) 742-4139
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Arizona Gastroenterology Ltd
Tucson, Arizona
Find Dr. Klein's professional email, personal email and mobile number
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Dr. Frederick A. Klein is a gastroenterologist in Tucson, Arizona
Dr. Klein practices at Arizona Gastroenterology Ltd in Tucson, Arizona.
Dr. Klein's NPI, 1962487876, was assigned on December 13, 2005. Dr. Klein graduated from Northwestern University Feinberg Medical School in 1980. Dr. Klein holds Arizona license 11761.
NPI and contact details
- NPI
- 1962487876NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6406832146
- NPI enumeration date
- December 13, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (520) 742-4139
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Frederick A. Klein practices at Arizona Gastroenterology Ltd in Tucson, Arizona
Dr. Klein's primary practice is Arizona Gastroenterology Ltd, at 7566 N La Cholla Blvd, Tucson, AZ 85741 in Pima County. The practice phone is (520) 742-4139.
- Arizona Gastroenterology Ltd7566 N La Cholla Blvd, Tucson, AZ 85741 · Pima CountyPhone(520) 742-4139
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Frederick A. Klein is affiliated with 5 sites of care and 1 medical group
Dr. Klein's primary practice is Arizona Gastroenterology Ltd in Tucson, Arizona. Dr. Klein is also affiliated with Tucson Medical Center. The medical group on file is Arizona Gastroenterology, Northwest. Dmand AI also links Dr. Klein to 2 more hospitals and 1 group practice or clinic, each named with a free account.
Arizona Gastroenterology LtdPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Frederick A. Klein's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Klein practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Arizona Gastroenterology Ltd | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Frederick A. Klein is one of 380 gastroenterologists in Arizona
Gastroenterology is Dr. Klein's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Klein is licensed in Arizona.
Specialties and state licenses
- Gastroenterology, ArizonaPrimary
Gastroenterologists near Dr. Klein
Counts of gastroenterologists 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. Frederick A. Klein billed Medicare for 785 services in 2024
CMS data shows 785 Medicare services from Dr. Klein across 7 procedure codes in 2024, for 426 Medicare patients. Medicare paid $63,679 for them. Every service was in an office.
Medicare services, 2024785
Medicare patients426
Paid by Medicare$63,679
Procedure codes7
Dr. Klein's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8222024: 70514%
- Tests and treatments
- 2023: 792024: 6518%
- Surgery
- 2023: 02024: 15
Dr. Klein compared with the Arizona median for gastroenterologists, 2024
- Dr. Klein
- Arizona median
- Medicare services
- 785vs 50855% above
- Medicare patients
- 426vs 31934% above
- Part D claims
- 2,192vs 3107.1 times
Medians across 369 gastroenterologists in Arizona with Dmand AI profiles that report each measure.
Dr. Klein's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Klein and other gastroenterologists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Frederick A. Klein treated 426 Medicare patients in 2024, average age 77
CMS counts 426 Medicare patients who saw Dr. Klein in 2024. The largest group is 75 to 84, with 215 patients. 75% of them have high cholesterol, and 74% have high blood pressure. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Klein's median patient age at 72, with 53% women.
Medicare patients, 2024426
Average age77
Average risk score1.13
Dr. Klein's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Klein's Medicare patients by sex, 2024
- Women24558%
- Men18142%
Chronic conditions among Dr. Klein's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis52%
- Ischemic heart disease33%
- Osteoporosis27%
- Chronic kidney disease26%
- Diabetes24%
- Mood disorders24%
Share of Medicare patients with each condition. A patient can have several.
Dr. Klein's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Frederick A. Klein wrote 2,432 Medicare Part D claims in 2024
In 2024, Dr. Klein wrote 2,432 Medicare Part D claims for 733 patients. 89% of them were for generic drugs. CMS names the drug for 2,192 of them, across 24 drugs with 11 or more claims each, at $352,845 in total drug cost. In 2023, CMS named 2,243 claims across 26 drugs.
Part D claims, 20242,432
Drugs named by CMS24
Total drug cost$352,845
Part D patients733
Dr. Klein's Part D claims by kind of drug, 2024
- Generic2,175 claims89%
- Brand-name and other257 claims11%
Dr. Klein's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Klein's Part D claims, 2024
- Antibiotics2%40 of 2,432 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,2432024: 2,1922%
Drugs named by CMS: 24 in 2024, 26 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Frederick A. Klein scored 22 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 22 out of 100 for Dr. Klein for performance year 2024, reported individually. Dr. Klein accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Klein's MIPS scores, performance year 2024
- 22of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 75of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Frederick A. Klein has 4 publications on record
Dmand AI links 4 papers to Dr. Klein, published from 2013 to 2014. 2014 was the busiest year, with 2. Dr. Klein's most frequent co-authors are Michael Benton Freeman, MD, Oscar H. Grandas, MD and Joshua David Arnold, MD.
Papers4
Years published2013 to 2014
Dr. Klein's most frequent co-authors
- Michael Benton Freeman, MD2 shared papers
- Oscar H. Grandas, MD2 shared papers
- Joshua David Arnold, MD1 shared paper
Recent publications by Dr. Klein
Cells, CulturedDisease Models, AnimalInterleukin-1beta
AngiographyEmbolization, TherapeuticHemodynamics
See who Dr. Klein researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Klein works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Frederick A. Klein received $7,988 in industry payments from 2016 to 2025
CMS Open Payments shows 447 general payments to Dr. Klein from 37 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Abbvie Inc. paid the most, $2,006.
General payments to Dr. Klein by program year, 2016 to 2025
General payments to Dr. Klein by kind, 2016 to 2025
$8Kin total
- Food and beverage$7,91699%
- Gifts$721%
Companies that paid Dr. Klein the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Frederick A. Klein graduated from Northwestern University Feinberg Medical School
Dr. Klein graduated from Northwestern University Feinberg Medical School in 1980.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Frederick A. Klein'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (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) |
| 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. Frederick A. Klein
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. Frederick A. Klein's NPI number?
Dr. Frederick A. Klein's NPI number is 1962487876. It was assigned on December 13, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Frederick A. Klein?
Dr. Frederick A. Klein is a gastroenterologist in Tucson, Arizona. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Frederick A. Klein practice?
Dr. Klein practices at 7566 N La Cholla Blvd, Tucson, AZ 85741. Dr. Klein's primary practice is Arizona Gastroenterology Ltd in Tucson, Arizona. Dmand AI also links Dr. Klein to 2 hospitals and 1 group practice or clinic.
What is Dr. Frederick A. Klein's office phone number?
The practice phone on file for Dr. Klein is (520) 742-4139.
What is Dr. Frederick A. Klein's medical license number?
Dr. Klein holds Arizona license 11761.
Which hospitals is Dr. Frederick A. Klein affiliated with?
Dr. Klein is affiliated with Tucson Medical Center. Dmand AI links Dr. Klein to 2 more hospitals.
What medical group is Dr. Frederick A. Klein part of?
Dr. Klein is linked to Arizona Gastroenterology, Northwest.
Does Dr. Frederick A. Klein accept Medicare?
Yes. CMS data shows Dr. Klein billed Medicare for 785 services in 2024, and Dr. Klein accepts Medicare assignment.
What is Dr. Frederick A. Klein's MIPS score?
Dr. Klein's MIPS final score for performance year 2024 is 22 out of 100, reported individually.
How many Medicare patients does Dr. Frederick A. Klein see?
CMS counts 426 Medicare patients who saw Dr. Klein in 2024, with an average age of 77.
Show 7 more questionsShow fewer questions
What services does Dr. Frederick A. Klein bill to Medicare?
In 2024, Dr. Klein's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and office visit, new patient (99204).
Where did Dr. Frederick A. Klein go to medical school?
Dr. Klein graduated from Northwestern University Feinberg Medical School in 1980.
What drugs does Dr. Frederick A. Klein prescribe most?
In 2024 Medicare Part D data, Dr. Klein's most prescribed drugs by claims were Pantoprazole Sodium, Omeprazole and Sucralfate.
Has Dr. Frederick A. Klein received payments from drug or device companies?
CMS Open Payments shows $7,988 in general payments to Dr. Klein from 37 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Frederick A. Klein been practicing?
Dr. Klein graduated from medical school in 1980, 46 years ago.
Does Dr. Frederick A. Klein do research?
Dmand AI links 4 publications to Dr. Klein, published from 2013 to 2014.
Who does Dr. Frederick A. Klein publish with?
Dr. Klein's most frequent co-authors are Michael Benton Freeman, MD (2 shared papers), Oscar H. Grandas, MD (2 shared papers) and Joshua David Arnold, MD (1 shared paper).
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