Christopher M Larson
Surgery • Aberdeen, SD
310 S Penn St, Suite 201
Aberdeen, SD 574014553
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on July 21, 2008; this date does not establish years in practice.
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Published CMS data list 1,042 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 43239 — Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope: 199 service units.
- 99214 — Established patient outpatient office visit: 194 service units.
- 45378 — Diagnostic exam of large bowel using a flexible endoscope: 154 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 17 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 498 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Omeprazole — 159 prescription fills, including refills.
- Sucralfate — 62 prescription fills, including refills.
- Metronidazole — 36 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 14 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 90% of clinicians listed under Surgery in South Dakota (2024, 64 clinicians with data). Median for this group: 268. Middle half: 121 to 413.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 564 in 2020 to 1,042 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
310 S Penn St
Suite 201
Aberdeen, SD 574014553
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 2 distinct group names: Avera Mckennan; Avera St Lukes. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Sanford School Of Medicine Of University Of South Dakota
2003
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
730 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $167,311 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $126,092 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
723 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$4,942 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $202.52 across 10 records.
By nature of payment
- Food and Beverage: $202.52 across 10 records.
Reporting-company totals (3 largest of 7)
- Kerecis Limited: $46.28 across 2 records.
- Phathom Pharmaceuticals, Inc.: $45.67 across 3 records.
- Davol Inc.: $43.24 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
23 years (graduated 2003)
CMS Doctors and Clinicians data list 2003 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Christopher Larson has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Christopher Larson as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Aberdeen and South Dakota
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 90% of clinicians listed under Surgery in South Dakota (2024, 64 clinicians with data). Median for this group: 268. Middle half: 121 to 413.
Too few clinicians listed under Surgery in Aberdeen have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Surgery in South Dakota (2024, 64 clinicians with data). Median for this group: $28,711. Middle half: $16,492 to $54,512.
Too few clinicians listed under Surgery in Aberdeen have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Surgery in South Dakota (2024, 64 clinicians with data). Median for this group: $22,686. Middle half: $11,719 to $43,891.
Too few clinicians listed under Surgery in Aberdeen have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Surgery in South Dakota (2024, 61 clinicians with data). Median for this group: 76. Middle half: 28 to 162.
Too few clinicians listed under Surgery in Aberdeen have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Surgery in South Dakota (2024, 61 clinicians with data). Median for this group: $693. Middle half: $191 to $2,510.
Too few clinicians listed under Surgery in Aberdeen have Medicare Part D data for 2024 to compare.
6 active clinicians are listed under Surgery with a practice address in Aberdeen, SD (114 in South Dakota).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 85% from 564 in 2020 to 1,042 in 2024.
- 2020: 564
- 2021: 681
- 2022: 659
- 2023: 833
- 2024: 1,042
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Medicare-allowed amount
Medicare-allowed amount increased 86% from $90,062 in 2020 to $167,311 in 2024.
- 2020: $90,062
- 2021: $108,480
- 2022: $98,089
- 2023: $133,936
- 2024: $167,311
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Paid by Medicare
Paid by Medicare increased 76% from $71,509 in 2020 to $126,092 in 2024.
- 2020: $71,509
- 2021: $85,428
- 2022: $75,029
- 2023: $104,572
- 2024: $126,092
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Medicare Part D prescriptions
Medicare Part D prescriptions varied from year to year: 461 in 2020 and 498 in 2024.
- 2020: 461
- 2021: 502
- 2022: 300
- 2023: 320
- 2024: 498
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30-day fills
30-day fills increased 35% from 535 in 2020 to 723 in 2024.
- 2020: 535
- 2021: 603
- 2022: 370
- 2023: 432
- 2024: 723
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Part D drug cost
Part D drug cost decreased 15% from $5,788 in 2020 to $4,942 in 2024.
- 2020: $5,788
- 2021: $6,872
- 2022: $4,200
- 2023: $4,679
- 2024: $4,942
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $112.75 in 2021 to $202.52 in 2025.
- 2021: $112.75
- 2022: $15.79
- 2023: $51.17
- 2024: $249.00
- 2025: $202.52
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $202.52.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Davol Inc. |
Food and Beverage
In-kind items and services
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Progel Applicator Spray Tips | General | $43.24 |
| Kerecis Limited |
Food and Beverage
Cash or cash equivalent
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Kerecis SurgiClose | General | $23.52 |
| Kerecis Limited |
Food and Beverage
Cash or cash equivalent
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Kerecis SurgiClose | General | $22.76 |
| CSL Behring |
Food and Beverage
In-kind items and services
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Kcentra | General | $21.37 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $17.35 |
| Integra LifeSciences Corporation |
Food and Beverage
In-kind items and services
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Integra | General | $16.58 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $16.09 |
| Merit Medical Systems Inc |
Food and Beverage
Cash or cash equivalent
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ESOPHYX | General | $14.73 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Echelon Circular | General | $14.65 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $12.23 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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199 | 190 | $133.35 | $98.40 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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194 | 161 | $125.12 | $91.69 |
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45378
Diagnostic exam of large bowel using a flexible endoscope
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154 | 152 | $171.92 | $165.70 |
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45384
Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery
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100 | 98 | $209.04 | $206.01 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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91 | 91 | $160.98 | $125.18 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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61 | 52 | $88.07 | $62.17 |
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G0121
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk
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44 | 44 | $172.39 | $165.09 |
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43281
Repair of hernia of muscle at esophagus and stomach using an endoscope
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29 | 29 | $900.80 | $797.45 |
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45380
Biopsy of large bowel using a flexible endoscope
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29 | 29 | $187.06 | $184.23 |
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47562
Removal of gallbladder using an endoscope
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24 | 24 | $605.47 | $595.93 |
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43235
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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23 | 22 | $110.01 | $88.61 |
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43233
Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, 3.0 cm or more
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18 | 15 | $211.63 | $208.36 |
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36561
Insertion of central venous tube with port (5 years or older)
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17 | 17 | $305.33 | $300.44 |
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77001
Fluoroscopic guidance for insertion or removal of central vein access device
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17 | 17 | $16.74 | $16.47 |
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43450
Dilation of esophagus
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16 | 16 | $75.30 | $39.49 |
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49505
Repair of groin hernia (5 years or older)
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13 | 13 | $497.56 | $489.59 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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13 | 13 | $55.35 | $33.18 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Omeprazole | Omeprazole | 159 | 10,228 | $1,205.52 | 82 |
| Sucralfate | Sucralfate | 62 | 2,260 | $1,531.96 | 52 |
| Metronidazole | Metronidazole | 36 | 243 | $221.32 | 32 |
| Prednisone | Prednisone | 33 | 618 | $153.52 | 27 |
| Peg-3350 And Electrolytes | Peg3350/Sod Sulf,bicarb,cl/Kcl | 31 | 60 | $561.22 | 29 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 27 | 261 | $97.34 | 22 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 26 | 259 | $299.14 | 21 |
| Metoclopramide Hcl | Metoclopramide Hcl | 24 | 978 | $150.52 | 18 |
| Pantoprazole Sodium | Pantoprazole Sodium | 21 | 1,034 | $125.51 | — |
| Gavilyte-G | Peg3350/Sod Sulf,bicarb,cl/Kcl | 21 | 22 | $307.88 | 20 |
| Neomycin Sulfate | Neomycin Sulfate | 17 | 20 | $100.45 | 16 |
| Ondansetron Odt | Ondansetron | 16 | 48 | $121.16 | 13 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 14 | 166 | $58.20 | 12 |
| Diazepam | Diazepam | 11 | 71 | $8.72 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20080905000152
SD
2163598764
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Avera St Lukes
111 W 10th Ave, Redfield, SD 574691519
Phone: 6056222573
Avera Mckennan
300 W 5th St, Miller, SD 573621238
Phone: 6058530158
Avera St Lukes
201 S Lloyd St, Aberdeen, SD 574014509
Phone: 6056222545
Avera St Lukes
8 E Us Hwy 12, Groton, SD 574452176
Phone: 6053974242
Avera St Lukes
305 S State St, Aberdeen, SD 574014527
Phone: 6056225100
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated July 21, 2008.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Surgery Specialists in Aberdeen
Healthcare providers in AberdeenMailing Address
310 S Penn St, Suite 201
Aberdeen, SD 574014553
Phone: 6052291367