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Dr. Gary L. Timmerman, MD
NPI1326095332
- Medicare services, 2020
- 12
- Part D claims, 2016
- 27
- Publications
- 14
- Hospital affiliations
- 1
- Industry payments
- $1,166
- Practice address
- 1305 W 18th Street, Sioux Falls, SD 57117
- Practice phone
- Call (605) 328-6758
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sanford Medical Center - Unit
Acute Care Hospital-Unit · Sioux Falls, South Dakota
Find Dr. Timmerman'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. Gary L. Timmerman is a general surgeon in Sioux Falls, South Dakota
Dr. Timmerman practices at Sanford Medical Center - Unit in Sioux Falls, South Dakota.
Dr. Timmerman's NPI, 1326095332, was assigned on May 27, 2006. Dr. Timmerman graduated from Washington University School of Medicine in 1984. Dr. Timmerman holds South Dakota license 2787.
NPI and contact details
- NPI
- 1326095332NPI Registry (opens in a new tab)
- NPI enumeration date
- May 27, 2006
- NPI status
- Active
- Practice phone
- (605) 328-6758
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gary L. Timmerman practices at Sanford Medical Center - Unit in Sioux Falls, South Dakota
Dr. Timmerman's primary practice is Sanford Medical Center - Unit, at 1305 W 18th Street, Sioux Falls, SD 57117 in Minnehaha County. The practice phone is (605) 328-6758.
- Sanford Medical Center - Unit1305 W 18th Street, Sioux Falls, SD 57117 · Minnehaha CountyPhone(605) 328-6758
Source: Dmand AI Affiliation Data
Dr. Gary L. Timmerman is affiliated with 4 sites of care and 2 medical groups
Dr. Timmerman's primary practice is Sanford Medical Center - Unit in Sioux Falls, South Dakota. The medical group on file is Edith Sanford Breast Center Sioux Falls. Dmand AI also links Dr. Timmerman to 2 more group practices and clinics, 1 imaging center and 1 medical group, each named with a free account.
Sanford Medical Center - UnitPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gary L. Timmerman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Timmerman practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sanford Medical Center - Unit | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gary L. Timmerman is one of 105 general surgeons in South Dakota
Surgery is Dr. Timmerman's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Timmerman's licenses on file in 2 states: South Dakota and Minnesota.
Specialties and state licenses
- Surgery, South DakotaPrimary
- Minnesota license
General surgeons near Dr. Timmerman
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. Gary L. Timmerman billed Medicare for 12 services in 2020
CMS data shows 12 Medicare services from Dr. Timmerman across 1 procedure code in 2020. Medicare paid $51 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202012
Paid by Medicare$51
Procedure codes1
Dr. Timmerman's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Other services
- 2019: 02020: 12
- Office and hospital visits
- 2019: 332020: 0100%
Dr. Timmerman compared with the South Dakota median for general surgeons, 2020
- Dr. Timmerman
- South Dakota median
- Medicare services
- 12vs 17893% below
- Part D claims
- 27vs 3625% below
Medians across 105 general surgeons in South Dakota with Dmand AI profiles that report each measure.
Dr. Timmerman's most billed Medicare procedure codes, 2020
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. Timmerman and other general surgeons in South Dakota.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gary L. Timmerman's patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Dr. Timmerman's median patient age at 55, with 50% women.
Dr. Timmerman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Gary L. Timmerman wrote 27 Medicare Part D claims in 2016
In 2016, Dr. Timmerman wrote 27 Medicare Part D claims. They cover 2 drugs, with $1,383 in total drug cost.
Part D claims, 201627
Drugs named by CMS2
Total drug cost$1,383
Dr. Timmerman's most prescribed drugs by claims, 2016
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gary L. Timmerman has 14 publications on record
Dmand AI links 14 papers to Dr. Timmerman, published from 2011 to 2022. 2014 was the busiest year, with 3. The most frequent topics are Pancreas, General Surgery and Internship and Residency. Dr. Timmerman has published most often in S D Med. Dr. Timmerman's most frequent co-authors are Miroslaw A. Mazurczak, MD, Bhavesh Patel, MD and Robert P. Sticca, MD.
Papers14
Years published2011 to 2022
Dr. Timmerman's papers by year, 2011 to 2022
Topics Dr. Timmerman writes about most
- Pancreas
- General Surgery
- Internship and Residency
- Pancreatectomy
- Pancreatic Neoplasms
- Rural Health Services
- Wounds, Nonpenetrating
Dr. Timmerman's most frequent co-authors
- Miroslaw A. Mazurczak, MD2 shared papers
- Bhavesh Patel, MD2 shared papers
- Robert P. Sticca, MD2 shared papers
Recent publications by Dr. Timmerman
General SurgeryMinnesotaNorth Dakota
Surg Clin North Am
CurriculumGeneral SurgeryInternship and Residency
See who Dr. Timmerman researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Timmerman works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gary L. Timmerman received $1,166 in industry payments from 2016 to 2025
CMS Open Payments shows 64 general payments to Dr. Timmerman from 30 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 96% of the total. Merck Sharp & Dohme Corporation paid the most, $135.
General payments to Dr. Timmerman by program year, 2016 to 2025
General payments to Dr. Timmerman by kind, 2016 to 2025
$1.2Kin total
- Food and beverage$1,11796%
- Education$434%
- Entertainment$61%
Companies that paid Dr. Timmerman 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. Gary L. Timmerman graduated from Washington University School of Medicine
Dr. Timmerman graduated from Washington University School of Medicine in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gary L. Timmerman'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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. Gary L. Timmerman
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. Gary L. Timmerman's NPI number?
Dr. Gary L. Timmerman's NPI number is 1326095332. It was assigned on May 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gary L. Timmerman?
Dr. Gary L. Timmerman is a general surgeon in Sioux Falls, South Dakota. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gary L. Timmerman practice?
Dr. Timmerman practices at 1305 W 18th Street, Sioux Falls, SD 57117. Dr. Timmerman's primary practice is Sanford Medical Center - Unit in Sioux Falls, South Dakota. Dmand AI also links Dr. Timmerman to 2 group practices and clinics, 1 imaging center and 1 medical group.
What is Dr. Gary L. Timmerman's office phone number?
The practice phone on file for Dr. Timmerman is (605) 328-6758.
What is Dr. Gary L. Timmerman's medical license number?
Dr. Timmerman holds South Dakota license 2787, one of the licenses on file in 2 states.
Which states has Dr. Gary L. Timmerman been licensed in?
Dmand AI has state licenses on file for Dr. Timmerman in South Dakota and Minnesota.
What medical group is Dr. Gary L. Timmerman part of?
Dr. Timmerman is linked to Edith Sanford Breast Center Sioux Falls. Dmand AI links Dr. Timmerman to 1 more medical group.
Does Dr. Gary L. Timmerman accept Medicare?
Yes. CMS data shows Dr. Timmerman billed Medicare for 12 services in 2020.
What services does Dr. Gary L. Timmerman bill to Medicare?
In 2020, Dr. Timmerman's most billed Medicare services were medicare service (G0500).
Where did Dr. Gary L. Timmerman go to medical school?
Dr. Timmerman graduated from Washington University School of Medicine in 1984.
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What drugs does Dr. Gary L. Timmerman prescribe most?
In 2016 Medicare Part D data, Dr. Timmerman's most prescribed drugs by claims were Suprep and Clopidogrel.
Has Dr. Gary L. Timmerman received payments from drug or device companies?
CMS Open Payments shows $1,166 in general payments to Dr. Timmerman from 30 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Gary L. Timmerman been practicing?
Dr. Timmerman graduated from medical school in 1984, 42 years ago.
Does Dr. Gary L. Timmerman do research?
Dmand AI links 14 publications to Dr. Timmerman, published from 2011 to 2022.
Who does Dr. Gary L. Timmerman publish with?
Dr. Timmerman's most frequent co-authors are Miroslaw A. Mazurczak, MD (2 shared papers), Bhavesh Patel, MD (2 shared papers) and Robert P. Sticca, MD (2 shared papers).
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