Joint InstabilityPatellar DislocationPatellofemoral Joint
Dr. Zachary Gerald Ries, MD
NPI1841558285PAC ID8426298589
- Medicare services, 2024
- 1,470
- Medicare patients, 2024
- 370
- Part D claims, 2024
- 453
- Publications
- 11
- Hospital affiliations
- 6
- Practice address
- 1202 W Howard St, Knoxville, IA 50138
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Knoxville Clinic - HOPD
Critical Access Hospital · Knoxville, Iowa
Find Dr. Ries' professional email, personal email and mobile number
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Dr. Zachary Gerald Ries is an orthopedic surgeon in Knoxville, Iowa
Dr. Ries practices at Knoxville Clinic - HOPD in Knoxville, Iowa.
Dr. Ries' NPI, 1841558285, was assigned on April 23, 2012. Dr. Ries graduated from University of Iowa, RJ & L Carver College of Medicine in 2012. Dr. Ries holds Iowa license MD-45095.
NPI and contact details
- NPI
- 1841558285NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8426298589
- NPI enumeration date
- April 23, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Zachary Gerald Ries practices at Knoxville Clinic - HOPD in Knoxville, Iowa
Dr. Ries' primary practice is Knoxville Clinic - HOPD, at 1202 W Howard St, Knoxville, IA 50138.
- Knoxville Clinic - HOPD1202 W Howard St, Knoxville, IA 50138
Source: Dmand AI Affiliation Data
Dr. Zachary Gerald Ries is affiliated with 8 sites of care and 2 medical groups
Dr. Ries' primary practice is Knoxville Clinic - HOPD in Knoxville, Iowa. Dr. Ries is also affiliated with Knoxville Hospital & Clinics. The medical group on file is Knoxville Hospital & Clinics. Dmand AI also links Dr. Ries to 4 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.
Knoxville Clinic - HOPDPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Zachary Gerald Ries' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ries practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Knoxville Clinic - HOPD | Available with a free account |
| +7 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Zachary Gerald Ries is one of 219 orthopedic surgeons in Iowa
Orthopaedic surgery is Dr. Ries' primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Ries is licensed in Iowa.
Specialties and state licenses
- Orthopaedic surgery, IowaPrimary
Orthopedic surgeons near Dr. Ries
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
219orthopedic surgeons in Iowa
3orthopedic surgeons in Knoxville
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Zachary Gerald Ries billed Medicare for 1,470 services in 2024
CMS data shows 1,470 Medicare services from Dr. Ries across 23 procedure codes in 2024, for 370 Medicare patients. Medicare paid $252,825 for them.
Medicare services, 20241,470
Medicare patients370
Paid by Medicare$252,825
Procedure codes23
Dr. Ries' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4082024: 49221%
- Surgery
- 2023: 2582024: 48990%
- Imaging
- 2023: 4042024: 47317%
- Other services
- 2023: 362024: 1656%
Where Dr. Ries' Medicare services took place, 2024
- In an office94464%
- In a facility52636%
Dr. Ries compared with the Iowa median for orthopedic surgeons, 2024
- Dr. Ries
- Iowa median
- Medicare services
- 1,470vs 1,02643% above
- Medicare patients
- 370vs 28530% above
- Part D claims
- 406vs 1004.1 times
Medians across 221 orthopedic surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. Ries' 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. Ries and other orthopedic surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Zachary Gerald Ries treated 370 Medicare patients in 2024, average age 73
CMS counts 370 Medicare patients who saw Dr. Ries in 2024. The largest group is 65 to 74, with 221 patients. 75% of them have arthritis, and 75% have high cholesterol. Their average risk score is 0.91, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ries' median patient age at 68, with 51% women.
Medicare patients, 2024370
Average age73
Average risk score0.91
Dr. Ries' Medicare patients by age, 2024
Dr. Ries' Medicare patients by sex, 2024
- Women16946%
- Men20154%
Chronic conditions among Dr. Ries' Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure74%
- Mood disorders30%
- Depression29%
- Chronic kidney disease25%
- Diabetes25%
- Anxiety24%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ries' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Zachary Gerald Ries wrote 453 Medicare Part D claims in 2024
In 2024, Dr. Ries wrote 453 Medicare Part D claims for 197 patients. 98% of them were for generic drugs. CMS names the drug for 406 of them, across 9 drugs with 11 or more claims each, at $4,106 in total drug cost. In 2023, CMS named 290 claims across 8 drugs.
Part D claims, 2024453
Drugs named by CMS9
Total drug cost$4,106
Part D patients197
Dr. Ries' Part D claims by kind of drug, 2024
- Generic446 claims98%
- Brand-name and other7 claims2%
Dr. Ries' 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. Ries' Part D claims, 2024
- Opioids24%107 of 453 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: 2902024: 40640%
Drugs named by CMS: 9 in 2024, 8 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. Zachary Gerald Ries ranks in the 96th percentile for laminectomy or laminotomy (partial removal of spine bones) in Medicare
Dr. Ries accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 118 procedures of laminectomy or laminotomy (partial removal of spine bones) by Dr. Ries, more than 96% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Ries ranks in Medicare procedure volume
- Spinal fusion
- 93rd percentile243 procedures
- Laminectomy or laminotomy (partial removal of spine bones)
- 96th percentile118 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Zachary Gerald Ries has 11 publications on record
Dmand AI links 11 papers to Dr. Ries, published from 2010 to 2018. The most frequent topics are Radiography, Bone Plates and Bone Screws. Dr. Ries has published most often in Iowa Orthop J. Dr. Ries' most frequent co-authors are Stuart L. Weinstein, MD, John L. Marsh, MD and Andrew James Pugely, MD.
Papers11
Years published2010 to 2018
Dr. Ries' papers by year, 2010 to 2018
Topics Dr. Ries writes about most
- Radiography
- Bone Plates
- Bone Screws
- Femoral Fractures
- Fracture Fixation, Internal
- Kyphosis
- Lordosis
- Lumbar Vertebrae
Dr. Ries' most frequent co-authors
- Stuart L. Weinstein, MD3 shared papers
- John L. Marsh, MD2 shared papers
- Andrew James Pugely, MD2 shared papers
Recent publications by Dr. Ries
Arthroplasty, Replacement, KneeBone PlatesBone Screws
See who Dr. Ries researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ries works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Zachary Gerald Ries received $48,961 in industry payments from 2016 to 2025
CMS Open Payments shows 291 general payments to Dr. Ries from 19 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 48% of the total. Stryker Corporation paid the most, $23,891.
General payments to Dr. Ries by program year, 2016 to 2025
General payments to Dr. Ries by kind, 2016 to 2025
$49Kin total
- Consulting fees$23,35048%
- Travel and lodging$13,97829%
- Food and beverage$11,63324%
Companies that paid Dr. Ries 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. Zachary Gerald Ries graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Ries graduated from University of Iowa, RJ & L Carver College of Medicine in 2012.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Zachary Gerald Ries'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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)Doctors and Clinicians Utilization Data (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. Zachary Gerald Ries
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. Zachary Gerald Ries' NPI number?
Dr. Zachary Gerald Ries' NPI number is 1841558285. It was assigned on April 23, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Gerald Ries?
Dr. Zachary Gerald Ries is an orthopedic surgeon in Knoxville, Iowa. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Zachary Gerald Ries practice?
Dr. Ries practices at 1202 W Howard St, Knoxville, IA 50138. Dr. Ries' primary practice is Knoxville Clinic - HOPD in Knoxville, Iowa. Dmand AI also links Dr. Ries to 4 hospitals, 2 group practices and clinics and 1 medical group.
What is Dr. Zachary Gerald Ries' medical license number?
Dr. Ries holds Iowa license MD-45095.
Which hospitals is Dr. Zachary Gerald Ries affiliated with?
Dr. Ries is affiliated with Knoxville Hospital & Clinics. Dmand AI links Dr. Ries to 5 more hospitals.
What medical group is Dr. Zachary Gerald Ries part of?
Dr. Ries is linked to Knoxville Hospital & Clinics. Dmand AI links Dr. Ries to 1 more medical group.
Does Dr. Zachary Gerald Ries accept Medicare?
Yes. CMS data shows Dr. Ries billed Medicare for 1,470 services in 2024, and Dr. Ries accepts Medicare assignment.
How many Medicare patients does Dr. Zachary Gerald Ries see?
CMS counts 370 Medicare patients who saw Dr. Ries in 2024, with an average age of 73.
What services does Dr. Zachary Gerald Ries bill to Medicare?
In 2024, Dr. Ries' most billed Medicare services were diagnostic imaging (72100), office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Zachary Gerald Ries go to medical school?
Dr. Ries graduated from University of Iowa, RJ & L Carver College of Medicine in 2012.
Show 5 more questionsShow fewer questions
What drugs does Dr. Zachary Gerald Ries prescribe most?
In 2024 Medicare Part D data, Dr. Ries' most prescribed drugs by claims were Mupirocin, Gabapentin and Methocarbamol.
Has Dr. Zachary Gerald Ries received payments from drug or device companies?
CMS Open Payments shows $48,961 in general payments to Dr. Ries from 19 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Zachary Gerald Ries been practicing?
Dr. Ries graduated from medical school in 2012, 14 years ago.
Does Dr. Zachary Gerald Ries do research?
Dmand AI links 11 publications to Dr. Ries, published from 2010 to 2018.
Who does Dr. Zachary Gerald Ries publish with?
Dr. Ries' most frequent co-authors are Stuart L. Weinstein, MD (3 shared papers), John L. Marsh, MD (2 shared papers) and Andrew James Pugely, MD (2 shared papers).
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