Thomas R Merring , PA
Physician Assistant • Wilmington, DE
1941 Limestone Rd, Ste 101
Wilmington, DE 198085408
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Thomas Merring is listed in NPPES under Physician Assistant.
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NPI assigned on August 9, 2012; this date does not establish years in practice.
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Published CMS data list 262 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 27447 — Replacement of knee joint, both sides of knee: 188 service units.
- 27130 — Replacement of thigh bone and hip joint with prosthesis: 74 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 1,526 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Oxycodone Hcl — 251 prescription fills, including refills.
- Gabapentin — 246 prescription fills, including refills.
- Celecoxib — 242 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 14 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in Wilmington, DE (2024, 52 clinicians with data). Median for this group: 326. Middle half: 160 to 534.
Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in Delaware (2024, 347 clinicians with data). Median for this group: 270. Middle half: 87 to 688.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 340 in 2020 to 262 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1941 Limestone Rd
Ste 101
Wilmington, DE 198085408
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Regional Orthopaedic Associates Pa. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2012
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
271 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $46,049 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $36,689 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
1,674 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$18,218 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $1,071.50 across 11 records.
By nature of payment
- Travel and Lodging: $786.34 across 2 records.
- Food and Beverage: $285.16 across 9 records.
Reporting-company totals
- Pacira Pharmaceuticals Incorporated: $847.99 across 4 records.
- Stryker Corporation: $223.51 across 7 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
14 years (graduated 2012)
CMS Doctors and Clinicians data list 2012 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2012
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Thomas Merring has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Thomas Merring as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Wilmington and Delaware
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Physician Assistant in Wilmington, DE (2024, 52 clinicians with data). Median for this group: 326. Middle half: 160 to 534.
Close to the middle for clinicians listed under Physician Assistant in Delaware (2024, 347 clinicians with data). Median for this group: 270. Middle half: 87 to 688.
Medicare-allowed amount
A higher Medicare-allowed amount than 75% of clinicians listed under Physician Assistant in Wilmington, DE (2024, 52 clinicians with data). Median for this group: $25,742. Middle half: $12,642 to $41,073.
A higher Medicare-allowed amount than 70% of clinicians listed under Physician Assistant in Delaware (2024, 347 clinicians with data). Median for this group: $20,935. Middle half: $8,185 to $49,614.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Physician Assistant in Wilmington, DE (2024, 52 clinicians with data). Median for this group: $19,022. Middle half: $8,992 to $30,806.
A higher Medicare payment amount than 70% of clinicians listed under Physician Assistant in Delaware (2024, 347 clinicians with data). Median for this group: $15,940. Middle half: $6,131 to $36,829.
Medicare Part D prescriptions
More Part D prescriptions than 85% of clinicians listed under Physician Assistant in Wilmington, DE (2024, 58 clinicians with data). Median for this group: 293. Middle half: 144 to 938.
More Part D prescriptions than 85% of clinicians listed under Physician Assistant in Delaware (2024, 323 clinicians with data). Median for this group: 250. Middle half: 92 to 740.
Part D drug cost
Close to the middle for clinicians listed under Physician Assistant in Wilmington, DE (2024, 58 clinicians with data). Median for this group: $12,921. Middle half: $1,274 to $72,305.
A higher Part D drug cost than 60% of clinicians listed under Physician Assistant in Delaware (2024, 323 clinicians with data). Median for this group: $3,978. Middle half: $611 to $67,690.
138 active clinicians are listed under Physician Assistant with a practice address in Wilmington, DE (695 in Delaware).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Wilmington
12.3% of these 138 clinicians have the CMS telehealth indicator.
44.9% of these 138 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 23% from 340 in 2020 to 262 in 2024.
- 2020: 340
- 2021: 594
- 2022: 714
- 2023: 702
- 2024: 262
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Medicare-allowed amount
Medicare-allowed amount decreased 25% from $61,641 in 2020 to $46,049 in 2024.
- 2020: $61,641
- 2021: $113,538
- 2022: $94,724
- 2023: $99,613
- 2024: $46,049
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Paid by Medicare
Paid by Medicare decreased 25% from $49,002 in 2020 to $36,689 in 2024.
- 2020: $49,002
- 2021: $90,799
- 2022: $74,758
- 2023: $78,315
- 2024: $36,689
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 27% from 1,206 in 2020 to 1,526 in 2024.
- 2020: 1,206
- 2021: 1,523
- 2022: 1,292
- 2023: 1,622
- 2024: 1,526
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30-day fills
30-day fills increased 28% from 1,310 in 2020 to 1,674 in 2024.
- 2020: 1,310
- 2021: 1,650
- 2022: 1,382
- 2023: 1,749
- 2024: 1,674
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Part D drug cost
Part D drug cost increased 27% from $14,352 in 2020 to $18,218 in 2024.
- 2020: $14,352
- 2021: $20,922
- 2022: $15,757
- 2023: $19,020
- 2024: $18,218
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $872.37 in 2021 to $1,071.50 in 2025.
- 2021: $872.37
- 2022: $24.11
- 2023: $115.26
- 2024: $180.79
- 2025: $1,071.50
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 – December 31, 2025): 11 records totaling $1,071.50.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Pacira Pharmaceuticals Incorporated |
Travel and Lodging
In-kind items and services
|
Iovera | General | $566.96 |
| Pacira Pharmaceuticals Incorporated |
Travel and Lodging
In-kind items and services
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Iovera | General | $219.38 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
|
MAKO | General | $118.16 |
| Pacira Pharmaceuticals Incorporated |
Food and Beverage
In-kind items and services
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Iovera | General | $48.93 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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MAKO | General | $28.69 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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MAKO | General | $21.46 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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MAKO | General | $16.75 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
|
MAKO | General | $16.33 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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MAKO | General | $13.85 |
| Pacira Pharmaceuticals Incorporated |
Food and Beverage
In-kind items and services
|
Iovera | General | $12.72 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
|
MAKO | General | $8.27 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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27447
Replacement of knee joint, both sides of knee
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188 | 184 | $6501.68 | $176.65 |
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27130
Replacement of thigh bone and hip joint with prosthesis
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74 | 73 | $6506.62 | $173.50 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Oxycodone Hcl | Oxycodone Hcl | 251 | 1,241 | $1,259.89 | 209 |
| Gabapentin | Gabapentin | 246 | 6,435 | $1,045.03 | 222 |
| Celecoxib | Celecoxib | 242 | 6,656 | $8,467.19 | 219 |
| Omeprazole | Omeprazole | 211 | 8,782 | $1,758.67 | 202 |
| Diazepam | Diazepam | 178 | 1,136 | $333.40 | 160 |
| Ondansetron Hcl | Ondansetron Hcl | 160 | 575 | $835.91 | 156 |
| Meloxicam | Meloxicam | 47 | 1,776 | $251.02 | 37 |
| Mupirocin | Mupirocin | 45 | 574 | $262.15 | 45 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 39 | 155 | $244.03 | 36 |
| Tramadol Hcl | Tramadol Hcl | 32 | 169 | $96.36 | 27 |
| Amoxicillin | Amoxicillin | 29 | 85 | $59.58 | 28 |
| Hydromorphone Hcl | Hydromorphone Hcl | 23 | 115 | $112.42 | 21 |
| Xarelto | Rivaroxaban | 12 | 184 | $3,304.17 | 12 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 11 | 313 | $188.38 | 11 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20240314001804
PA
4880844638
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Regional Orthopaedic Associates Pa
100 Wilmington W Chester Pike, Chadds Ford, PA 193179040
Phone: 3026559494
Regional Orthopaedic Associates Pa
1941 Limestone Rd, Wilmington, DE 198085413
Phone: 3026559494
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant
Career & Practice History
NPI enumerated August 09, 2012.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Physician Assistants in Wilmington
- Joan Taddei
- Charles Mikulka, PA-C
- Julie Sims, PA-C
- Bernard Schneider, PA-C
- Denise Lano, PA-C
- Kirklin Mitchell, PA-C
Mailing Address
1941 Limestone Rd, Ste 101
Wilmington, DE 198085408
Phone: 3026333555