Surg Infect (Larchmt)
ColectomyColonic NeoplasmsCross Infection
Dr. John Gary Armstrong, MD
NPI1487948824PAC ID8820222508
- Medicare services, 2024
- 180
- Medicare patients, 2026
- 164
- Part D claims, 2026
- 14
- Publications
- 4
- MIPS score, 2026
- 91
- Practice address
- 1525 West 5th Street, Storm Lake, IA 50588
- Practice phone
- Call (712) 732-4030
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Armstrong'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. John Gary Armstrong is a general surgeon in Storm Lake, Iowa
Dr. Armstrong practices at Buena Vista Regional Medical Center in Storm Lake, Iowa, part of State of Iowa.
Dr. Armstrong's NPI, 1487948824, was assigned on June 2, 2011. Dr. Armstrong graduated from University of Iowa, RJ & L Carver College of Medicine in 2011. Dr. Armstrong holds Iowa license 44498.
NPI and contact details
- NPI
- 1487948824NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8820222508
- NPI enumeration date
- June 2, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (712) 732-4030
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Gary Armstrong practices at Buena Vista Regional Medical Center in Storm Lake, Iowa
Dr. Armstrong's primary practice is Buena Vista Regional Medical Center, at 1525 West 5th Street, Storm Lake, IA 50588 in Buena Vista County. The practice phone is (712) 732-4030.
- Buena Vista Regional Medical Center1525 West 5th Street, Storm Lake, IA 50588 · Buena Vista CountyPhone(712) 732-4030
Source: Dmand AI Affiliation Data
Dr. John Gary Armstrong is affiliated with 4 sites of care and 1 medical group
Dr. Armstrong's primary practice is Buena Vista Regional Medical Center in Storm Lake, Iowa, part of State of Iowa. Dr. Armstrong is also affiliated with Cherokee Regional Medical Center. The medical group on file is Buena Vista Regional Medical Center. Dmand AI also links Dr. Armstrong to 1 more hospital and 1 group practice or clinic, each named with a free account. Dr. Armstrong's employer is on file too: a hospital.
Cherokee Regional Medical CenterBuena Vista Regional Medical Center1 hospitalName with a free account1 group practice or clinicName with a free accountEmployer: hospitalName with a free account
See all 5 affiliations for Dr. ArmstrongSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Gary Armstrong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Armstrong practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Buena Vista Regional Medical Center | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Armstrong practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across State of Iowa and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John Gary Armstrong is one of 317 general surgeons in Iowa
Surgery is Dr. Armstrong's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Armstrong is licensed in Iowa.
Specialties and state licenses
- Surgery, IowaPrimary
General surgeons near Dr. Armstrong
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
317general surgeons in Iowa
2general surgeons in Storm Lake
2general surgeons at Buena Vista Regional Medical CenterSources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Gary Armstrong billed Medicare for 180 services in 2024
CMS data shows 180 Medicare services from Dr. Armstrong across 7 procedure codes in 2024, for 164 Medicare patients. Medicare paid $19,070 for them.
Medicare services, 2024180
Medicare patients164
Paid by Medicare$19,070
Procedure codes7
Dr. Armstrong's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 1492024: 12119%
- Office and hospital visits
- 2023: 622024: 595%
- Other services
- 2023: 332024: 0100%
Where Dr. Armstrong's Medicare services took place, 2024
- In an office5933%
- In a facility12167%
Dr. Armstrong compared with the Iowa median for general surgeons, 2024
- Dr. Armstrong
- Iowa median
- Medicare services
- 180vs 16410% above
- Medicare patients
- 164vs 14612% above
- Part D claims
- 11vs 4374% below
Medians across 332 general surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. Armstrong'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. Armstrong?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Armstrong and other general surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Gary Armstrong treated 164 Medicare patients in 2026, average age 74
CMS counts 164 Medicare patients who saw Dr. Armstrong in 2026. The largest group is 65 to 74, with 94 patients. 73% of them have high blood pressure, and 73% 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. Armstrong's median patient age at 70, with 44% women.
Medicare patients, 2026164
Average age74
Average risk score0.88
Dr. Armstrong's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Dr. Armstrong's Medicare patients by sex, 2026
- Women7445%
- Men9055%
Chronic conditions among Dr. Armstrong's Medicare patients, 2026
- High blood pressure73%
- High cholesterol73%
- Arthritis37%
- Diabetes34%
- Atrial fibrillation21%
- Mood disorders21%
- Anxiety20%
- Cancer20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Armstrong's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
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. John Gary Armstrong wrote 14 Medicare Part D claims in 2026
In 2026, Dr. Armstrong wrote 14 Medicare Part D claims for 11 patients. 100% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $75 in total drug cost. In 2018, CMS named 55 claims across 1 drug.
Part D claims, 202614
Drugs named by CMS1
Total drug cost$75
Part D patients11
Dr. Armstrong's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2022
- 2018
- 2022
- Claims for drugs CMS names
- 2018: 552022: 1180%
Drugs named by CMS: 1 in 2022, 1 in 2018.
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. John Gary Armstrong scored 91 out of 100 in Medicare's MIPS program for 2026
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 91 out of 100 for Dr. Armstrong for performance year 2026, reported individually. Dr. Armstrong accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 38 procedures of colonoscopy by Dr. Armstrong, more than 58% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Armstrong's MIPS scores, performance year 2026
- 91of 100Final score
- 85of 100Quality
- 92of 100Promoting Interoperability
- 40of 100Improvement Activities
- 91of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Armstrong ranks in Medicare procedure volume
- Colonoscopy
- 58th percentile38 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 54th percentile26 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
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)
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. John Gary Armstrong has 4 publications on record
Dmand AI links 4 papers to Dr. Armstrong, published from 2015 to 2017. 2015 was the busiest year, with 2. The most frequent topics are Postoperative Complications, Colectomy and Length of Stay. Dr. Armstrong's most frequent co-authors are John Charles Byrn, MD, Christopher Andrew Anthony, MD and Jennifer Erin Hrabe, MD.
Papers4
Years published2015 to 2017
Dr. Armstrong's papers by year, 2015 to 2017
Topics Dr. Armstrong writes about most
- Postoperative Complications
- Colectomy
- Length of Stay
- Patient Safety
Dr. Armstrong's most frequent co-authors
- John Charles Byrn, MD4 shared papers
- Christopher Andrew Anthony, MD1 shared paper
- Jennifer Erin Hrabe, MD1 shared paper
Recent publications by Dr. Armstrong
Academic Medical CentersAnalysis of VarianceHealth Care Surveys
ColectomyHealth Care CostsLaparoscopy
See who Dr. Armstrong researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Armstrong 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. John Gary Armstrong received $119 in industry payments from 2020 to 2024
CMS Open Payments shows 4 general payments to Dr. Armstrong from 3 drug and device companies from 2020 to 2024. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $71.
General payments to Dr. Armstrong by program year, 2020 to 2024
Companies that paid Dr. Armstrong the most, 2020 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Gary Armstrong graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Armstrong graduated from University of Iowa, RJ & L Carver College of Medicine in 2011.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Gary Armstrong'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) |
| 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. John Gary Armstrong
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. John Gary Armstrong's NPI number?
Dr. John Gary Armstrong's NPI number is 1487948824. It was assigned on June 2, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. John Gary Armstrong?
Dr. John Gary Armstrong is a general surgeon in Storm Lake, Iowa. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. John Gary Armstrong practice?
Dr. Armstrong practices at 1525 West 5th Street, Storm Lake, IA 50588. Dr. Armstrong's primary practice is Buena Vista Regional Medical Center in Storm Lake, Iowa, part of State of Iowa. Dmand AI also links Dr. Armstrong to 1 hospital and 1 group practice or clinic, and a free account names each one.
What is Dr. John Gary Armstrong's office phone number?
The practice phone on file for Dr. Armstrong is (712) 732-4030. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. John Gary Armstrong's email address?
Dmand AI checks professional and personal email addresses for Dr. Armstrong through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. John Gary Armstrong's medical license number?
Dr. Armstrong holds Iowa license 44498.
Which hospitals is Dr. John Gary Armstrong affiliated with?
Dr. Armstrong practices at Buena Vista Regional Medical Center in Storm Lake, Iowa. Dr. Armstrong is also affiliated with Cherokee Regional Medical Center. Dmand AI links Dr. Armstrong to 1 more hospital, named with a free account.
What medical group is Dr. John Gary Armstrong part of?
Dr. Armstrong is linked to Buena Vista Regional Medical Center.
Who employs Dr. John Gary Armstrong?
Dmand AI has Dr. Armstrong's employer on file: a hospital. The organization's name is available with a free Dmand AI account.
Who does Dr. John Gary Armstrong practice with?
Dmand AI links 21 HCPs to Dr. Armstrong's primary medical group, 2 of them general surgeons. A free account lists them, with verified contacts.
Show 11 more questionsShow fewer questions
Does Dr. John Gary Armstrong accept Medicare?
Yes. CMS data shows Dr. Armstrong billed Medicare for 180 services in 2024, and Dr. Armstrong accepts Medicare assignment.
What is Dr. John Gary Armstrong's MIPS score?
Dr. Armstrong's MIPS final score for performance year 2026 is 91 out of 100, reported individually.
How many Medicare patients does Dr. John Gary Armstrong see?
CMS counts 164 Medicare patients who saw Dr. Armstrong in 2026, with an average age of 74.
What services does Dr. John Gary Armstrong bill to Medicare?
In 2024, Dr. Armstrong's most billed Medicare services were surgery: digestive system (45385), surgery: digestive system (45380) and surgery: digestive system (43239).
Where did Dr. John Gary Armstrong go to medical school?
Dr. Armstrong graduated from University of Iowa, RJ & L Carver College of Medicine in 2011.
What drugs does Dr. John Gary Armstrong prescribe most?
In 2022 Medicare Part D data, Dr. Armstrong's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. John Gary Armstrong received payments from drug or device companies?
CMS Open Payments shows $119 in general payments to Dr. Armstrong from 3 companies from 2020 to 2024. The largest total came from Stryker Corporation.
How long has Dr. John Gary Armstrong been practicing?
Dr. Armstrong graduated from medical school in 2011, 15 years ago.
Does Dr. John Gary Armstrong do research?
Dmand AI links 4 publications to Dr. Armstrong, published from 2015 to 2017.
Who does Dr. John Gary Armstrong publish with?
Dr. Armstrong's most frequent co-authors are John Charles Byrn, MD (4 shared papers), Christopher Andrew Anthony, MD (1 shared paper) and Jennifer Erin Hrabe, MD (1 shared paper).
What EHR does Dr. John Gary Armstrong's practice use?
Dmand AI tracks the EHR system at Buena Vista Regional Medical Center and at 3 more affiliated sites. The vendor and product are available with a free Dmand AI account.
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