Andrea Castonguay, PA
Physician Assistant · Williamsville, NY
Andrea Castonguay, PA is a physician assistant with a practice address in Williamsville, New York, and NPI 1831458603, issued on May 14, 2012. Check the license with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Andrea Castonguay
- Credential
- PA
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 5500 Main St, Williamsville, NY 14221
- Phone
- (716) 906-5908
- Enumerated
- May 14, 2012
- Record last updated
- Jul 14, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (716) 204-4061
- Medicare enrollment
- Enrolled (PECOS I20120918000680); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 15,555 in New York → Look up another NPI →
Also registered at 5500 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dale BauerClinical Social Worker1174984793
- Barbara Daniels, LCSWClinical Social Worker1295891331
- Mary Carol Dearing, LCSW-RClinical Social Worker1710271093
- Helen Erkkila, PH.DClinical Psychologist1215071212
- Sheila Flavin, RDRegistered Dietitian1649356825
- Frank Giardina, R.D.Registered Dietitian1235463506
Verify Andrea Castonguay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average physician assistant in 2024
176 Medicare Part D claims for 111 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 75 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen29 claims
- Ibuprofen27 claims
- Meloxicam21 claims
- Oxycodone Hcl18 claims
- Oxycodone-Acetaminophen17 claims
- Doxycycline Hyclate14 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 practice group's MIPS final score for 2023 (Medicare payment program): 90 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Erie County Medical Center CorporationBuffalo, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrea Castonguay among 15,555 physician assistant records in New York
Andrea Castonguay, PA is one of 15,555 physician assistant records with a practice address in New York. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 31% of them.
- NPI issued2012 · 31% of these records are older, 66% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2012 · median 2018 among the 8,158 with a school on file
- Record last updated2015 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
178 physician assistant records list a practice address in Williamsville
They are 178 of the 3,530 NPPES records with a practice address in Williamsville, and 15,555 physician assistant records in New York.
All 15,555 in New York → Every provider in Williamsville → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Gregory Czajka, RPA CWilliamsville, NY 142211740265537
- Tammy Ervolina-Kroll, RPA-CWilliamsville, NY 142211801852777
- Allison Fout, PAWilliamsville, NY 142211275501348
- Jill Hess, PAWilliamsville, NY 142211063471407
- Cara Innus, RPA-CWilliamsville, NY 142211538126388
- Jennifer Kielbasa, RPA CWilliamsville, NY 142211942283031
- Sherry Lyons, RPA-CWilliamsville, NY 142211134109903
- Robin Massing, RPA-CWilliamsville, NY 142211801869284
Common questions
What is Andrea Castonguay, PA's NPI number?
Andrea Castonguay, PA's National Provider Identifier (NPI) is 1831458603, issued on May 14, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Andrea Castonguay, PA located?
The NPPES record lists a practice address at 5500 Main St, Williamsville, NY, 14221. Phone: (716) 906-5908. Providers update this record themselves, so call before visiting.
How can I verify Andrea Castonguay, PA's license?
Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Andrea Castonguay, PA prescribe under Medicare Part D?
In 2024, Andrea Castonguay, PA had 176 Medicare Part D claims for 111 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Andrea Castonguay, PA's MIPS final score?
The 2023 MIPS final score is 90 of 100, reported for the practice group. 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.