Dr. Thomas E. Niesen, MD
- Medicare services, 2024
- 2,684
- Medicare patients, 2026
- 1,476
- Part D claims, 2026
- 528
- MIPS score, 2026
- 82
- Hospital affiliations
- 2
- Practice address
- 232 S Woods Mill Rd, Chesterfield, MO 63017
- Practice phone
- Call (314) 434-1500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Niesen'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. Thomas E. Niesen is a general surgeon in Chesterfield, Missouri
Dr. Niesen practices at St. Luke's Hospital in Chesterfield, Missouri, part of St. Luke's Episcopal-Presbyterian Hospital.
Dr. Niesen's NPI, 1700870250, was assigned on September 9, 2005. Dr. Niesen graduated from Tulane University School of Medicine in 1978. Dr. Niesen holds Missouri license 36096.
- NPI
- 1700870250NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688766645
- NPI enumeration date
- September 9, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 434-1500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas E. Niesen practices at St. Luke's Hospital in Chesterfield, Missouri
Dr. Niesen's primary practice is St. Luke's Hospital, at 232 S Woods Mill Rd, Chesterfield, MO 63017 in St. Louis County. The practice phone is (314) 434-1500.
- St. Luke's Hospital232 S Woods Mill Rd, Chesterfield, MO 63017 · St. Louis CountyPhone(314) 434-1500
Source: Dmand AI Affiliation Data
Dr. Thomas E. Niesen is affiliated with 6 sites of care and 1 medical group
Dr. Niesen's primary practice is St. Luke's Hospital in Chesterfield, Missouri, part of St. Luke's Episcopal-Presbyterian Hospital. Dr. Niesen is also affiliated with Mercy Hospital St. Louis. The medical group on file is St. Luke's Medical Group. Dmand AI also links Dr. Niesen to 1 more breast imaging center, 1 physician office, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas E. Niesen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Niesen practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Luke's Hospital | Available with a free account |
| +5 more affiliated sites | 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 St. Luke's Episcopal-Presbyterian Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Thomas E. Niesen is one of 593 general surgeons in Missouri
Surgery is Dr. Niesen's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Niesen is licensed in Missouri.
Specialties and state licenses
- Surgery, MissouriPrimary
General surgeons near Dr. Niesen
Counts of general 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. Thomas E. Niesen billed Medicare for 2,684 services in 2024
CMS data shows 2,684 Medicare services from Dr. Niesen across 30 procedure codes in 2024, for 1,476 Medicare patients. Medicare paid $219,477 for them.
Dr. Niesen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,1722024: 1,90212%
- Office and hospital visits
- 2023: 6222024: 56010%
- Surgery
- 2023: 842024: 14775%
- Imaging
- 2023: 572024: 7532%
Where Dr. Niesen's Medicare services took place, 2024
- In an office1,40552%
- In a facility1,27948%
Dr. Niesen compared with the Missouri median for general surgeons, 2024
- Dr. Niesen
- Missouri median
- Medicare services
- 2,684vs 16915.9 times
- Medicare patients
- 1,476vs 12711.6 times
- Part D claims
- 463vs 4111.3 times
Medians across 570 general surgeons in Missouri with Dmand AI profiles that report each measure.
Dr. Niesen'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas E. Niesen treated 1,476 Medicare patients in 2026, average age 78
CMS counts 1,476 Medicare patients who saw Dr. Niesen in 2026. The largest group is 75 to 84, with 654 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.89, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Niesen's median patient age at 77, with 44% women.
Dr. Niesen's Medicare patients by age, 2026
Dr. Niesen's Medicare patients by sex, 2026
- Women67946%
- Men79754%
Chronic conditions among Dr. Niesen's Medicare patients, 2026
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease52%
- Chronic kidney disease41%
- Atrial fibrillation36%
- Diabetes35%
- Heart failure34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Niesen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women44%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. Thomas E. Niesen wrote 528 Medicare Part D claims in 2026
In 2026, Dr. Niesen wrote 528 Medicare Part D claims for 217 patients. 94% of them were for generic drugs. CMS names the drug for 463 of them, across 7 drugs with 11 or more claims each, at $18,548 in total drug cost. In 2023, CMS named 475 claims across 7 drugs.
Dr. Niesen's Part D claims by kind of drug, 2026
- Generic496 claims94%
- Brand-name32 claims6%
Dr. Niesen'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. Niesen's Part D claims, 2026
- Opioids23%121 of 528 claims
- Antibiotics13%66 of 528 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: 4752024: 4633%
Drugs named by CMS: 7 in 2024, 7 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), 2026 data
Dr. Thomas E. Niesen scored 82 out of 100 in Medicare's MIPS program for 2026
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Niesen for performance year 2026, reported individually. Dr. Niesen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 50 procedures of leg revascularization (restoring blood flow) by Dr. Niesen, more than 95% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Niesen's MIPS scores, performance year 2026
- 82of 100Final score
- 57.6of 100Quality
- 40of 100Improvement Activities
- 80of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Niesen ranks in Medicare procedure volume
- Leg revascularization (restoring blood flow)
- 95th percentile50 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2026 data; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Thomas E. Niesen received $2,229 in industry payments from 2016 to 2025
CMS Open Payments shows 80 general payments to Dr. Niesen from 28 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Endologix, Inc. paid the most, $607.
General payments to Dr. Niesen by program year, 2016 to 2025
Companies that paid Dr. Niesen 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. Thomas E. Niesen graduated from Tulane University School of Medicine
Dr. Niesen graduated from Tulane University School of Medicine in 1978.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Thomas E. Niesen'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)Clinician Public Reporting: Overall MIPS Performance (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) |
| 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. Thomas E. Niesen
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. Thomas E. Niesen's NPI number?
Dr. Thomas E. Niesen's NPI number is 1700870250. It was assigned on September 9, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas E. Niesen?
Dr. Thomas E. Niesen is a general surgeon in Chesterfield, Missouri. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Thomas E. Niesen practice?
Dr. Niesen practices at 232 S Woods Mill Rd, Chesterfield, MO 63017. Dr. Niesen's primary practice is St. Luke's Hospital in Chesterfield, Missouri, part of St. Luke's Episcopal-Presbyterian Hospital. Dmand AI also links Dr. Niesen to 1 breast imaging center, 1 physician office, 1 group practice or clinic and 1 home health agency, and a free account names each one.
What is Dr. Thomas E. Niesen's office phone number?
The practice phone on file for Dr. Niesen is (314) 434-1500. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Thomas E. Niesen's email address?
Dmand AI checks professional and personal email addresses for Dr. Niesen through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Thomas E. Niesen's medical license number?
Dr. Niesen holds Missouri license 36096.
Which hospitals is Dr. Thomas E. Niesen affiliated with?
Dr. Niesen practices at St. Luke's Hospital in Chesterfield, Missouri. Dr. Niesen is also affiliated with Mercy Hospital St. Louis.
What medical group is Dr. Thomas E. Niesen part of?
Dr. Niesen is linked to St. Luke's Medical Group.
Who does Dr. Thomas E. Niesen practice with?
Dmand AI links 12 HCPs to Dr. Niesen's primary medical group, 5 of them general surgeons. A free account lists them, with verified contacts.
Does Dr. Thomas E. Niesen accept Medicare?
Yes. CMS data shows Dr. Niesen billed Medicare for 2,684 services in 2024, and Dr. Niesen accepts Medicare assignment.
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What is Dr. Thomas E. Niesen's MIPS score?
Dr. Niesen's MIPS final score for performance year 2026 is 82 out of 100, reported individually.
How many Medicare patients does Dr. Thomas E. Niesen see?
CMS counts 1,476 Medicare patients who saw Dr. Niesen in 2026, with an average age of 78.
What services does Dr. Thomas E. Niesen bill to Medicare?
In 2024, Dr. Niesen's most billed Medicare services were blood vessel study (93880), blood vessel study (93922) and blood vessel study (93970).
Where did Dr. Thomas E. Niesen go to medical school?
Dr. Niesen graduated from Tulane University School of Medicine in 1978.
What drugs does Dr. Thomas E. Niesen prescribe most?
In 2024 Medicare Part D data, Dr. Niesen's most prescribed drugs by claims were Clopidogrel, Hydrocodone-Acetaminophen and Tramadol HCl.
Has Dr. Thomas E. Niesen received payments from drug or device companies?
CMS Open Payments shows $2,229 in general payments to Dr. Niesen from 28 companies from 2016 to 2025. The largest total came from Endologix, Inc.
How long has Dr. Thomas E. Niesen been practicing?
Dr. Niesen graduated from medical school in 1978, 48 years ago.
What EHR does Dr. Thomas E. Niesen's practice use?
Dmand AI tracks the EHR system at St. Luke's Hospital and at 5 more affiliated sites. The vendor and product are available with a free Dmand AI account.
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