Thomas R. Merring, P.A.
Physician Assistant · Wilmington, DE
Thomas R. Merring, P.A. is a physician assistant with a practice address in Wilmington, Delaware, and NPI 1447507421, issued on Aug 9, 2012. Check the license with the Delaware board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Thomas R. Merring
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 1941 Limestone RD, Wilmington, DE 19808
- Phone
- (302) 633-3555
- Enumerated
- Aug 9, 2012
- Record last updated
- Aug 9, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (302) 633-3350
- Medicare enrollment
- Enrolled (PECOS I20240314001804); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 695 in Delaware → Look up another NPI →
Also registered at 1941 Limestone RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas R. Merring in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Delaware 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
90% more Medicare Part D claims than the average physician assistant in 2024
1,578 Medicare Part D claims for 386 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims. 354 claims were for opioids.
Most prescribed
- Oxycodone Hcl251 claims
- Gabapentin246 claims
- Celecoxib242 claims
- Omeprazole211 claims
- Diazepam178 claims
- Ondansetron Hcl160 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): 70.7 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).
Industry payments in 2024: $158.56
7 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. The 64,719 providers of this specialty with any payment received $841.65 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
- Regional Orthopaedic Associates PAChadds Ford, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas R. Merring among 695 physician assistant records in Delaware
Thomas R. Merring, P.A. is one of 695 physician assistant records with a practice address in Delaware. 79% 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 28% of them.
- NPI issued2012 · 28% of these records are older, 69% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2012 · median 2019 among the 462 with a school on file
- Record last updated2012 · 34% 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 Delaware practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
138 physician assistant records list a practice address in Wilmington
They are 138 of the 6,291 NPPES records with a practice address in Wilmington, and 695 physician assistant records in Delaware.
All 695 in Delaware → Every provider in Wilmington → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Robert Biddle, PAWilmington, DE 198081467462051
- Joseph Cassidy, PAWilmington, DE 198081558371146
- Crystal Dimauro, PAWilmington, DE 198081750832812
- George Duffield, PA-CWilmington, DE 198081689101917
- Catherine Frescoln, PAWilmington, DE 198081629280375
- Daniel Maistre, PA-CWilmington, DE 198081770949026
- Chioma Njoku, PHYSICIAN ASSISTANTWilmington, DE 198081831483783
- Jane Ramsay, PA-CWilmington, DE 198081487030334
Common questions
What is Thomas R. Merring, P.A.'s NPI number?
Thomas R. Merring, P.A.'s National Provider Identifier (NPI) is 1447507421, issued on Aug 9, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Thomas R. Merring, P.A. located?
The NPPES record lists a practice address at 1941 Limestone RD, Wilmington, DE, 19808. Phone: (302) 633-3555. Providers update this record themselves, so call before visiting.
How can I verify Thomas R. Merring, P.A.'s license?
Search the Delaware board that licenses this profession; the NPPES record confirms identity only.
How much does Thomas R. Merring, P.A. prescribe under Medicare Part D?
In 2024, Thomas R. Merring, P.A. had 1,578 Medicare Part D claims for 386 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Thomas R. Merring, P.A.'s MIPS final score?
The 2023 MIPS final score is 70.7 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.