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Dr. Robert S. Armstrong, MD
NPI1003058520PAC ID1052538535
- Medicare services, 2024
- 253
- Medicare patients, 2024
- 178
- Part D claims, 2024
- 43
- Clinical trials
- 10
- Hospital affiliations
- 1
- Practice address
- 950 A Union Rd, West Seneca, NY 14224
- Practice phone
- Call (716) 677-4161
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Center for Ambulatory Surgery LLC
West Seneca, New York
Find Dr. Armstrong's professional email, personal email and mobile number
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Dr. Robert S. Armstrong is a general surgeon in West Seneca, New York
Dr. Armstrong practices at Center for Ambulatory Surgery LLC in West Seneca, New York.
Dr. Armstrong's NPI, 1003058520, was assigned on March 30, 2009. Dr. Armstrong graduated from Wright State University Boonshoft School of Medicine in 2009. Dr. Armstrong holds New York license 274206-1.
NPI and contact details
- NPI
- 1003058520NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1052538535
- NPI enumeration date
- March 30, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (716) 677-4161
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert S. Armstrong practices at Center for Ambulatory Surgery LLC in West Seneca, New York
Dr. Armstrong's primary practice is Center for Ambulatory Surgery LLC, at 950 A Union Rd, West Seneca, NY 14224 in Erie County. The practice phone is (716) 677-4161.
- Center for Ambulatory Surgery LLC950 A Union Rd, West Seneca, NY 14224 · Erie CountyPhone(716) 677-4161
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert S. Armstrong is affiliated with 3 sites of care and 1 medical group
Dr. Armstrong's primary practice is Center for Ambulatory Surgery LLC in West Seneca, New York. Dr. Armstrong is also affiliated with Mercy Hospital of Buffalo. The medical group on file is Surgical Associates of Western New York. Dmand AI also links Dr. Armstrong to 1 more group practice or clinic, named with a free account.
Center for Ambulatory Surgery LLCPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Robert S. Armstrong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Armstrong practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Center for Ambulatory Surgery LLC | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert S. Armstrong is one of 1,604 general surgeons in New York
Surgery is Dr. Armstrong's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Armstrong is licensed in New York.
Specialties and state licenses
- Surgery, New YorkPrimary
General surgeons near Dr. Armstrong
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
1,604general surgeons in New York
2general surgeons in West Seneca
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Robert S. Armstrong billed Medicare for 253 services in 2024
CMS data shows 253 Medicare services from Dr. Armstrong across 9 procedure codes in 2024, for 178 Medicare patients. Medicare paid $20,856 for them.
Medicare services, 2024253
Medicare patients178
Paid by Medicare$20,856
Procedure codes9
Dr. Armstrong's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2042024: 24018%
- Surgery
- 2023: 02024: 13
Where Dr. Armstrong's Medicare services took place, 2024
- In an office10240%
- In a facility15160%
Dr. Armstrong compared with the New York median for general surgeons, 2024
- Dr. Armstrong
- New York median
- Medicare services
- 253vs 15464% above
- Medicare patients
- 178vs 10963% above
- Part D claims
- 12vs 2450% below
Medians across 1,502 general surgeons in New York 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert S. Armstrong treated 178 Medicare patients in 2024, average age 70
CMS counts 178 Medicare patients who saw Dr. Armstrong in 2024. The largest group is 65 to 74, with 66 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 36% are also on Medicaid. Their average risk score is 1.95, 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. Armstrong's median patient age at 67, with 43% women.
Medicare patients, 2024178
Average age70
Average risk score1.95
Also on Medicaid36%
Dr. Armstrong's Medicare patients by age, 2024
Dr. Armstrong's Medicare patients by sex, 2024
- Women7944%
- Men9956%
Chronic conditions among Dr. Armstrong's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis47%
- Ischemic heart disease42%
- Anxiety41%
- Diabetes37%
- Mood disorders37%
- Chronic kidney disease36%
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 67
Patient panel by sex, all payers
- Women43%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Robert S. Armstrong wrote 43 Medicare Part D claims in 2024
In 2024, Dr. Armstrong wrote 43 Medicare Part D claims for 30 patients. 98% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $66 in total drug cost.
Part D claims, 202443
Drugs named by CMS1
Total drug cost$66
Part D patients30
Dr. Armstrong's Part D claims by kind of drug, 2024
- Generic42 claims98%
- Brand-name and other1 claims2%
Dr. Armstrong's most prescribed drugs by claims, 2017
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. Armstrong's Part D claims, 2024
- Opioids26%11 of 43 claims
- Antibiotics51%22 of 43 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Robert S. Armstrong ranks in the 89th percentile for hernia repair (minimally invasive) in Medicare
Dr. Armstrong accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 21 procedures of hernia repair (minimally invasive) by Dr. Armstrong, more than 89% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Armstrong ranks in Medicare procedure volume
- Colonoscopy
- 55th percentile32 procedures
- Hernia repair (minimally invasive)
- 89th percentile21 procedures
- Melanoma (skin cancer) excision
- 66th percentile12 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)
Removal of tissue: 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); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Robert S. Armstrong has worked on 10 clinical trials
Dmand AI links Dr. Armstrong to 10 clinical trials, 4 of them phase 2 studies. 9 are still active or recruiting. Conditions studied include Adenocarcinoma of Lung, Biliary Atresia and Low Back Pain.
Clinical trials with Dr. Armstrong by phase
- NonePhase 1: no trials
- 4Phase 2: 4 trials
- 1Phase 2/3: 1 trial
- NonePhase 3: no trials
- NonePhase 4: no trials
Trials with no phase (devices, behavioral studies) are left out.
Conditions in Dr. Armstrong's trials
- Adenocarcinoma of Lung
- Biliary Atresia
- Low Back Pain
- Malocclusion
- Muscular Atrophy
Investigators on the most trials with Dr. Armstrong
- Kader Tawfiq Abdelerahman, MD10 shared trials
- Randa Abdelmasih, MD10 shared trials
- Marjorie E. Affel, MD10 shared trials
Recent clinical trials with Dr. Armstrong
Adenocarcinoma of LungAdenocarcinoma
Sources: ClinicalTrials.gov (National Library of Medicine); and Dmand AI Research Linkage
Dr. Robert S. Armstrong received $1,696 in industry payments from 2016 to 2025
CMS Open Payments shows 69 general payments to Dr. Armstrong from 28 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $163.
General payments to Dr. Armstrong by program year, 2016 to 2025
Companies that paid Dr. Armstrong 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. Robert S. Armstrong graduated from Wright State University Boonshoft School of Medicine
Dr. Armstrong graduated from Wright State University Boonshoft School of Medicine in 2009.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert S. 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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 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) |
| Clinical trials and co-investigators | ClinicalTrials.gov (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. Robert S. 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. Robert S. Armstrong's NPI number?
Dr. Robert S. Armstrong's NPI number is 1003058520. It was assigned on March 30, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert S. Armstrong?
Dr. Robert S. Armstrong is a general surgeon in West Seneca, New York. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Robert S. Armstrong practice?
Dr. Armstrong practices at 950 A Union Rd, West Seneca, NY 14224. Dr. Armstrong's primary practice is Center for Ambulatory Surgery LLC in West Seneca, New York. Dmand AI also links Dr. Armstrong to 1 group practice or clinic.
What is Dr. Robert S. Armstrong's office phone number?
The practice phone on file for Dr. Armstrong is (716) 677-4161.
What is Dr. Robert S. Armstrong's medical license number?
Dr. Armstrong holds New York license 274206-1.
Which hospitals is Dr. Robert S. Armstrong affiliated with?
Dr. Armstrong is affiliated with Mercy Hospital of Buffalo.
What medical group is Dr. Robert S. Armstrong part of?
Dr. Armstrong is linked to Surgical Associates of Western New York.
Does Dr. Robert S. Armstrong accept Medicare?
Yes. CMS data shows Dr. Armstrong billed Medicare for 253 services in 2024, and Dr. Armstrong accepts Medicare assignment.
How many Medicare patients does Dr. Robert S. Armstrong see?
CMS counts 178 Medicare patients who saw Dr. Armstrong in 2024, with an average age of 70.
What services does Dr. Robert S. Armstrong bill to Medicare?
In 2024, Dr. Armstrong's most billed Medicare services were hospital inpatient care (99222), hospital inpatient care (99231) and office visit, new patient (99203).
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Where did Dr. Robert S. Armstrong go to medical school?
Dr. Armstrong graduated from Wright State University Boonshoft School of Medicine in 2009.
What drugs does Dr. Robert S. Armstrong prescribe most?
In 2017 Medicare Part D data, Dr. Armstrong's most prescribed drugs by claims were Omeprazole.
Has Dr. Robert S. Armstrong received payments from drug or device companies?
CMS Open Payments shows $1,696 in general payments to Dr. Armstrong from 28 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Robert S. Armstrong been practicing?
Dr. Armstrong graduated from medical school in 2009, 17 years ago.
Does Dr. Robert S. Armstrong do research?
Dr. Armstrong has worked on 10 clinical trials.
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