Luis A. Armstrong, M.D.
Gastroenterology Physician · Casper, WY
Luis A. Armstrong, M.D. is a gastroenterology physician with a practice address in Casper, Wyoming, and NPI 1952411670, issued on Aug 30, 2006. Check the license on the Wyoming Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Luis A. Armstrong
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- M3867 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1026 E 2ND St, Casper, WY 82601
- Phone
- (073) 333-0002
- Enumerated
- Aug 30, 2006
- Record last updated
- Nov 8, 2024
- Fax
- (307) 202-5112
- Medicare enrollment
- Enrolled (PECOS I20240703004030); accepts Medicare assignment
- Medical or professional school
- Ponce School Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 13 in Wyoming → Look up another NPI →
Also registered at 1026 E 2ND St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Cloud, MDGastroenterology Physician1518179126
- Sarah Hall, PA-CPhysician Assistant1881355865
- Harlie HimmelbergMedical Physician Assistant1427772516
- Anna KnoppFamily Nurse Practitioner1245436609
- William Shear, MDGastroenterology Physician1053523878
Verify Luis A. Armstrong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWyoming Board of MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% more Medicare Part D claims than the average gastroenterology physician in 2024
1,178 Medicare Part D claims for 393 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Omeprazole371 claims
- Famotidine200 claims
- Sod Sulf-Potass Sulf-Mag Sulf151 claims
- Pantoprazole Sodium61 claims
- Esomeprazole Magnesium28 claims
- Creon26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $376.65
17 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Digestive Care Specialists, LLCCasper, WY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Luis A. Armstrong among 13 gastroenterology physician records in Wyoming
Luis A. Armstrong, M.D. is one of 13 gastroenterology physician records with a practice address in Wyoming. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 31% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Record last updated2024 · 92% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Wyoming practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Wyoming
There are 13 gastroenterology physician records in Wyoming.
All 13 in Wyoming → Every provider in Casper → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Jeffrey Cloud, MDCasper, WY 826011518179126
- Chad Cooper, M.D.Casper, WY 826011770876229
- Raoul Joubran, MDCasper, WY 826011689784373
- Kent Katz, MDCasper, WY 826011578673265
- Phillip Krmpotich, MDCasper, WY 826011932219623
- Robert Schlidt, MDCapser, WY 826011922118611
- William Shear, MDCasper, WY 826011053523878
- John Beckman, MDCheyenne, WY 820091881634095
Common questions
What is Luis A. Armstrong, M.D.'s NPI number?
Luis A. Armstrong, M.D.'s National Provider Identifier (NPI) is 1952411670, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Luis A. Armstrong, M.D. located?
The NPPES record lists a practice address at 1026 E 2ND St, Casper, WY, 82601. Phone: (073) 333-0002. Providers update this record themselves, so call before visiting.
How can I verify Luis A. Armstrong, M.D.'s license?
Search the Wyoming Board of Medicine at https://wyomedboard.wyo.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Luis A. Armstrong, M.D. prescribe under Medicare Part D?
In 2024, Luis A. Armstrong, M.D. had 1,178 Medicare Part D claims for 393 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.