Dr. David W Kossoff , MD
Specialist • Frederick, MD
110 Thomas Johnson Dr Ste 335
Frederick, MD 217024949
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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NPI assigned on October 25, 2006; this date does not establish years in practice.
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Published CMS data list 488 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:
- 45380 — Biopsy of large bowel using a flexible endoscope: 203 service units.
- 45385 — Removal of polyps or growths of large bowel using an endoscope with mechanical snare: 122 service units.
- 43239 — Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope: 121 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 all 5 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 42 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:
- Pantoprazole Sodium — 28 prescription fills, including refills.
- Omeprazole — 14 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 the full table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 75% of clinicians listed under Specialist in Maryland (2024, 222 clinicians with data). Median for this group: 1,498. Middle half: 497 to 3,299.
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 261 in 2020 to 488 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
110 Thomas Johnson Dr Ste 335
Frederick, MD 217024949
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: David W. Kossoff, M.D., 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
University Of Maryland School Of Medicine
1992
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
253 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 $60,550 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 $50,128 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
100 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
$465 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: $387.59 across 6 records.
By nature of payment
- Food and Beverage: $387.59 across 6 records.
Reporting-company totals (3 largest of 4)
- Phathom Pharmaceuticals, Inc.: $237.47 across 2 records.
- Regeneron Pharmaceuticals, Inc.: $86.94 across 1 record.
- ABBVIE INC.: $44.59 across 2 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
34 years (graduated 1992)
CMS Doctors and Clinicians data list 1992 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
2006
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)
Dr. Kossoff 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 Dr. Kossoff 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 Frederick and Maryland
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 75% of clinicians listed under Specialist in Maryland (2024, 222 clinicians with data). Median for this group: 1,498. Middle half: 497 to 3,299.
Too few clinicians listed under Specialist in Frederick have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 65% of clinicians listed under Specialist in Maryland (2024, 222 clinicians with data). Median for this group: $126,390. Middle half: $43,642 to $293,732.
Too few clinicians listed under Specialist in Frederick have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 65% of clinicians listed under Specialist in Maryland (2024, 222 clinicians with data). Median for this group: $94,726. Middle half: $33,185 to $213,378.
Too few clinicians listed under Specialist in Frederick have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Fewer Part D prescriptions than 85% of clinicians listed under Specialist in Maryland (2024, 214 clinicians with data). Median for this group: 420. Middle half: 95 to 1,119.
Too few clinicians listed under Specialist in Frederick have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 90% of clinicians listed under Specialist in Maryland (2024, 214 clinicians with data). Median for this group: $38,054. Middle half: $2,484 to $213,707.
Too few clinicians listed under Specialist in Frederick have Medicare Part D data for 2024 to compare.
23 active clinicians are listed under Specialist with a practice address in Frederick, MD (940 in Maryland).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Frederick
0% of these 23 clinicians have the CMS telehealth indicator.
43.5% of these 23 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 increased 87% from 261 in 2020 to 488 in 2024.
- 2020: 261
- 2021: 396
- 2022: 439
- 2023: 379
- 2024: 488
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Medicare-allowed amount
Medicare-allowed amount increased 71% from $35,319 in 2020 to $60,550 in 2024.
- 2020: $35,319
- 2021: $54,144
- 2022: $59,252
- 2023: $53,618
- 2024: $60,550
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Paid by Medicare
Paid by Medicare increased 85% from $27,055 in 2020 to $50,128 in 2024.
- 2020: $27,055
- 2021: $44,298
- 2022: $43,768
- 2023: $45,162
- 2024: $50,128
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Medicare Part D prescriptions
Medicare Part D prescriptions varied from year to year: 41 in 2020 and 42 in 2024.
- 2020: 41
- 2021: 33
- 2022: 43
- 2023: 46
- 2024: 42
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30-day fills
30-day fills increased 15% from 87 in 2020 to 100 in 2024.
- 2020: 87
- 2021: 73
- 2022: 103
- 2023: 98
- 2024: 100
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Part D drug cost
Part D drug cost went from $613 in 2020 to $465 in 2024.
- 2020: $613
- 2021: $691
- 2022: $795
- 2023: $697
- 2024: $465
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $84.83 in 2020 to $387.59 in 2025.
- 2020: $84.83
- 2021: $92.46
- 2022: $120.28
- 2024: $939.34
- 2025: $387.59
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): fewer than 11 records totaling $387.59.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $124.74 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
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VOQUEZNA | General | $112.73 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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DUPIXENT | General | $86.94 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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SKYRIZI | General | $22.88 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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RINVOQ | General | $21.71 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
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REZDIFFRA | General | $18.59 |
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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45380
Biopsy of large bowel using a flexible endoscope
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203 | 202 | $1500.00 | $95.18 |
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45385
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
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122 | 122 | $1426.00 | $241.10 |
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43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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121 | 113 | $1362.00 | $72.93 |
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43249
Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm
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29 | 27 | $3249.00 | $96.27 |
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45381
Injection beneath lining of large bowel using a flexible endoscope
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13 | 13 | $1284.00 | $15.21 |
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 |
|---|---|---|---|---|---|
| Pantoprazole Sodium | Pantoprazole Sodium | 28 | 2,460 | $379.49 | 19 |
| Omeprazole | Omeprazole | 14 | 546 | $85.40 | — |
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
Self-certified to NPPES: 2025-09-17NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GASTROENTEROLOGY
I20050405000630
MD
7113974908
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
David W. Kossoff, M.d., Pa
70 Thomas Johnson Dr, Frederick, MD 217024317
Phone: 3016245566
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Internal Medicine - Gastroenterology
Doctor of Osteopathic Medicine (D.O.)
Internal Medicine - Gastroenterology
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 110 THOMAS JOHNSON DR STE 335, FREDERICK, MD 217024949 (Tel: 3016245566)
Registered at 110 THOMAS JOHNSON DR STE 335, FREDERICK, MD 217024949 (Tel: 3016245566)
NPI status registered as active in NPPES database
Registered at 56 THOMAS JOHNSON DR, SUITE 110, FREDERICK, MD 217024599 (Tel: 3016245566)
Registered at 56 THOMAS JOHNSON DR, SUITE 110, FREDERICK, MD 217024599 (Tel: 3016245566)
Recorded as DAVID KOSSOFF, M.D.
Specialist (license number reported to NPPES: MD D0054121)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Specialists in Frederick
- Dr. Tanisha Osbourne, MD
- Dr. Laura Copaken, MD
- Dr. Jong Yoon, MD
- Dr. Robert Jackson, MD
- Dr. Jeffrey Gilsdorf, MD
- Dr. John Henry, MD
Mailing Address
110 Thomas Johnson Dr Ste 335
Frederick, MD 217024949
Phone: 3016245566