Dr. Mark Douglas Fish, DO
- Medicare services, 2024
- 1,614
- Medicare patients, 2024
- 389
- Part D claims, 2024
- 606
- Hospital affiliations
- 5
- Industry payments
- $44,280
- Practice address
- 1002 South Lincoln Street, Knoxville, IA 50138
- Practice phone
- Call (641) 842-2151
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Fish's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark Douglas Fish is an orthopedic surgeon in Knoxville, Iowa
Dr. Fish practices at Knoxville Hospital & Clinics in Knoxville, Iowa, part of Knoxville Hospital & Clinics.
Dr. Fish's NPI, 1548212368, was assigned on May 17, 2006. Dr. Fish holds Iowa license 3790.
- NPI
- 1548212368NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1951312305
- NPI enumeration date
- May 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (641) 842-2151
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Douglas Fish practices at Knoxville Hospital & Clinics in Knoxville, Iowa
Dr. Fish's primary practice is Knoxville Hospital & Clinics, at 1002 South Lincoln Street, Knoxville, IA 50138 in Marion County. The practice phone is (641) 842-2151.
- Knoxville Hospital & Clinics1002 South Lincoln Street, Knoxville, IA 50138 · Marion CountyPhone(641) 842-2151
Source: Dmand AI Affiliation Data
Dr. Mark Douglas Fish is affiliated with 9 sites of care and 7 medical groups
Dr. Fish's primary practice is Knoxville Hospital & Clinics in Knoxville, Iowa, part of Knoxville Hospital & Clinics. Dr. Fish is also affiliated with MercyOne Des Moines Medical Center. The medical group on file is Knoxville Hospital & Clinics. Dmand AI also links Dr. Fish to 3 more hospitals, 6 medical groups and 4 group practices and clinics, each named with a free account. Dr. Fish's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Douglas Fish's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fish practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Knoxville Hospital & Clinics | Available with a free account |
| +8 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Knoxville Hospital & Clinics and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark Douglas Fish is one of 219 orthopedic surgeons in Iowa
Orthopaedic surgery is Dr. Fish's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dmand AI has Dr. Fish's licenses on file in 2 states: Iowa and Indiana.
Specialties and state licenses
- Orthopaedic surgery, IowaPrimary
- Adult reconstructive orthopaedic surgery, Indiana
Orthopedic surgeons near Dr. Fish
Counts of orthopedic surgeons 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. Mark Douglas Fish billed Medicare for 1,614 services in 2024
CMS data shows 1,614 Medicare services from Dr. Fish across 22 procedure codes in 2024, for 389 Medicare patients. Medicare paid $172,636 for them.
Dr. Fish's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5242024: 5171%
- Imaging
- 2023: 4402024: 4656%
- Drugs given in the office
- 2023: 3062024: 3225%
- Surgery
- 2023: 3322024: 3107%
Where Dr. Fish's Medicare services took place, 2024
- In an office1,46691%
- In a facility1489%
Dr. Fish compared with the Iowa median for orthopedic surgeons, 2024
- Dr. Fish
- Iowa median
- Medicare services
- 1,614vs 1,02657% above
- Medicare patients
- 389vs 28536% above
- Part D claims
- 581vs 1005.8 times
Medians across 221 orthopedic surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. Fish'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.
Need commercial claims for Dr. Fish?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Fish and other orthopedic surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Douglas Fish treated 389 Medicare patients in 2024, average age 73
CMS counts 389 Medicare patients who saw Dr. Fish in 2024. The largest group is 65 to 74, with 224 patients. 75% of them have arthritis, and 75% have high cholesterol. Their average risk score is 0.88, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Fish's median patient age at 65, with 53% women.
Dr. Fish's Medicare patients by age, 2024
Dr. Fish's Medicare patients by sex, 2024
- Women22157%
- Men16843%
Chronic conditions among Dr. Fish's Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure72%
- Diabetes27%
- Mood disorders24%
- Ischemic heart disease23%
- Depression22%
- Anxiety20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Fish's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
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. Mark Douglas Fish wrote 606 Medicare Part D claims in 2024
In 2024, Dr. Fish wrote 606 Medicare Part D claims for 289 patients. 100% of them were for generic drugs. CMS names the drug for 581 of them, across 6 drugs with 11 or more claims each, at $2,360 in total drug cost. In 2023, CMS named 510 claims across 8 drugs.
Dr. Fish'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. Fish's Part D claims, 2024
- Opioids2%13 of 606 claims
- Antibiotics52%315 of 606 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: 5102024: 58114%
Drugs named by CMS: 6 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. Mark Douglas Fish ranks in the 88th percentile for upper limb (arm) arthroscopy (minimally invasive joint repair) in Medicare
Dr. Fish accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 55 procedures of upper limb (arm) arthroscopy (minimally invasive joint repair) by Dr. Fish, more than 88% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Fish ranks in Medicare procedure volume
- Upper limb (arm) arthroscopy (minimally invasive joint repair)
- 88th percentile55 procedures
- Knee replacement
- 73rd percentile41 procedures
- Hip replacement
- 75th percentile29 procedures
- Lower limb (leg) arthroscopy (minimally invasive joint repair)
- 87th percentile14 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. Mark Douglas Fish received $44,280 in industry payments from 2016 to 2025
CMS Open Payments shows 227 general payments to Dr. Fish from 17 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 32% of the total. Smith & Nephew, Inc. paid the most, $11,255.
General payments to Dr. Fish by program year, 2016 to 2025
General payments to Dr. Fish by kind, 2016 to 2025
- Travel and lodging$14,06332%
- Food and beverage$12,25228%
- Consulting fees$9,12521%
- Education$7,34017%
- Speaker and faculty fees$1,5003%
Companies that paid Dr. Fish the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark Douglas Fish'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 DataDmand AI Org Hierarchy 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Mark Douglas Fish
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. Mark Douglas Fish's NPI number?
Dr. Mark Douglas Fish's NPI number is 1548212368. It was assigned on May 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Douglas Fish?
Dr. Mark Douglas Fish is an orthopedic surgeon in Knoxville, Iowa. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Mark Douglas Fish practice?
Dr. Fish practices at 1002 South Lincoln Street, Knoxville, IA 50138. Dr. Fish's primary practice is Knoxville Hospital & Clinics in Knoxville, Iowa, part of Knoxville Hospital & Clinics. Dmand AI also links Dr. Fish to 3 hospitals, 6 medical groups and 4 group practices and clinics.
What is Dr. Mark Douglas Fish's office phone number?
The practice phone on file for Dr. Fish is (641) 842-2151.
What is Dr. Mark Douglas Fish's medical license number?
Dr. Fish holds Iowa license 3790, one of the licenses on file in 2 states.
Which states has Dr. Mark Douglas Fish been licensed in?
Dmand AI has state licenses on file for Dr. Fish in Iowa and Indiana.
Which hospitals is Dr. Mark Douglas Fish affiliated with?
Dr. Fish practices at Knoxville Hospital & Clinics in Knoxville, Iowa. Dr. Fish is also affiliated with MercyOne Des Moines Medical Center. Dmand AI links Dr. Fish to 3 more hospitals.
What medical group is Dr. Mark Douglas Fish part of?
Dr. Fish is linked to Knoxville Hospital & Clinics. Dmand AI links Dr. Fish to 6 more medical groups.
Does Dr. Mark Douglas Fish accept Medicare?
Yes. CMS data shows Dr. Fish billed Medicare for 1,614 services in 2024, and Dr. Fish accepts Medicare assignment.
How many Medicare patients does Dr. Mark Douglas Fish see?
CMS counts 389 Medicare patients who saw Dr. Fish in 2024, with an average age of 73.
Show 4 more questionsShow fewer questions
What services does Dr. Mark Douglas Fish bill to Medicare?
In 2024, Dr. Fish's most billed Medicare services were injected or infused drug (J0702), office visit, established patient (99214) and office visit, established patient (99213).
What drugs does Dr. Mark Douglas Fish prescribe most?
In 2024 Medicare Part D data, Dr. Fish's most prescribed drugs by claims were Amoxicillin, Meloxicam and Celecoxib.
Has Dr. Mark Douglas Fish received payments from drug or device companies?
CMS Open Payments shows $44,280 in general payments to Dr. Fish from 17 companies from 2016 to 2025. The largest total came from Smith & Nephew, Inc.
How long has Dr. Mark Douglas Fish been practicing?
Dr. Fish graduated from medical school in 2001, 25 years ago.
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