Shannon Leigh Tosounian, D.O.
Gastroenterology Physician · Center Valley, PA
Shannon Leigh Tosounian, D.O. is a gastroenterology physician with a practice address in Center Valley, Pennsylvania, and NPI 1013398734, issued on Jun 18, 2015. Check the license (Pennsylvania OS021519, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Shannon Leigh Tosounian
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- OS021519 PA
Self-reported in NPPES; status is on the state search - Practice location
- 5405 Saucon Creek RD, Center Valley, PA 18034
- Phone
- (484) 526-6545
- Enumerated
- Jun 18, 2015
- Record last updated
- Sep 12, 2025
- Medicare enrollment
- Enrolled (PECOS I20211008002855); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,049 in Pennsylvania → Look up another NPI →
Verify Shannon Leigh Tosounian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS021519Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% fewer Medicare Part D claims than the average gastroenterology physician in 2024
452 Medicare Part D claims for 143 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Omeprazole94 claims
- Pantoprazole Sodium62 claims
- Esomeprazole Magnesium43 claims
- Dicyclomine Hcl31 claims
- Gavilyte-G22 claims
- Famotidine20 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.
The MIPS final score for 2023 (Medicare payment program): 95.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $124.74
1 payment: food and beverage; the largest payer was Phathom Pharmaceuticals, 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
- St Lukes Physician Group IncFountain Hill, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Shannon Leigh Tosounian among 1,049 gastroenterology physician records in Pennsylvania
Shannon Leigh Tosounian, D.O. is one of 1,049 gastroenterology physician records with a practice address in Pennsylvania. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 85% of them.
- NPI issued2015 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2015 · median 2003 among the 769 with a school on file
- Record last updated2025 · 63% 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 gastroenterology physician records list a practice address in Center Valley
They are 3 of the 253 NPPES records with a practice address in Center Valley, and 1,049 gastroenterology physician records in Pennsylvania.
All 1,049 in Pennsylvania → Every provider in Center Valley → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Hammad Liaquat, MDCenter Valley, PA 180341194031054
- Vaishali Patel, MDCenter Valley, PA 180341124261656
- Lindsley Van Der Veer, MDEaston, PA 180421730133513
- Frank Dagostino, MDEaston, PA 180451043412802
- Barry Herman, M.D.Easton, PA 180451700865607
- Manoj Mittal, M.D.Easton, PA 180451720172737
- Shanker Mukherjee, M.D.Easton, PA 180451558340265
- Pooja Patel, DOEaston, PA 180451740748227
Common questions
What is Shannon Leigh Tosounian, D.O.'s NPI number?
Shannon Leigh Tosounian, D.O.'s National Provider Identifier (NPI) is 1013398734, issued on Jun 18, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Shannon Leigh Tosounian, D.O. located?
The NPPES record lists a practice address at 5405 Saucon Creek RD, Center Valley, PA, 18034. Phone: (484) 526-6545. Providers update this record themselves, so call before visiting.
How can I verify Shannon Leigh Tosounian, D.O.'s license?
NPPES lists Pennsylvania license number OS021519, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Shannon Leigh Tosounian, D.O. prescribe under Medicare Part D?
In 2024, Shannon Leigh Tosounian, D.O. had 452 Medicare Part D claims for 143 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Shannon Leigh Tosounian, D.O.'s MIPS final score?
The 2023 MIPS final score is 95.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.