Dr. John Mackenzie , DO
Emergency Medicine • Lewes, DE
424 Savannah Road
Lewes, DE 19958
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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Dr. John Mackenzie is listed in NPPES under Emergency Medicine.
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NPI assigned on January 10, 2006; this date does not establish years in practice.
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Published CMS data list 167 Original Medicare Part B services in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Published rows only; this is not a quality measure.
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Published Part B service records, 2022:
- 99285 — Emergency department visit with high level of medical decision making: 105 service units.
- 99284 — Emergency department visit with moderate level of medical decision making: 29 service units.
- 93010 — Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only: 22 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2021 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2022). CPT notice
See all 4 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 71 Medicare Part D prescriptions, including refills, in 2020.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Published rows only; this is not a quality measure.
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Published Part D records, 2020:
- Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) — 18 prescription fills, including refills.
- Prednisone — 16 prescription fills, including refills.
- Azithromycin — 15 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 5 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 778 in 2018 to 167 in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018–2022.
Practice Location & Contact Primary Location
424 Savannah Road
Lewes, DE 19958
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Emergency Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $24,786 in 2022
The total amount Medicare approved for these services in 2022. 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, 2022.
Paid by Medicare
About $21,275 in 2022
The part of the Medicare-allowed amount that Medicare itself paid in 2022, 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, 2022.
30-day fills
71 standardized 30-day fills in 2020
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
$448 in 2020
The total cost of these prescriptions in 2020, 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, 2020.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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.
Compared with the same specialty in Lewes and Delaware
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Mackenzie are from 2022.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Mackenzie are from 2020.
16 active clinicians are listed under Emergency Medicine with a practice address in Lewes, DE (243 in Delaware).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Lewes
6.2% of these 16 clinicians have the CMS telehealth indicator.
18.8% of these 16 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 79% from 778 in 2018 to 167 in 2022.
- 2018: 778
- 2019: 646
- 2020: 583
- 2021: 210
- 2022: 167
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Medicare-allowed amount
Medicare-allowed amount decreased 79% from $119,929 in 2018 to $24,786 in 2022.
- 2018: $119,929
- 2019: $101,376
- 2020: $95,859
- 2021: $36,807
- 2022: $24,786
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Paid by Medicare
Paid by Medicare decreased 77% from $92,213 in 2018 to $21,275 in 2022.
- 2018: $92,213
- 2019: $78,994
- 2020: $76,422
- 2021: $30,363
- 2022: $21,275
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 32% from 105 in 2016 to 71 in 2020.
- 2016: 105
- 2017: 25
- 2018: 24
- 2019: 47
- 2020: 71
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30-day fills
30-day fills decreased 32% from 105 in 2016 to 71 in 2020.
- 2016: 105
- 2017: 25
- 2018: 24
- 2019: 47
- 2020: 71
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Part D drug cost
Part D drug cost went from $650 in 2016 to $448 in 2020.
- 2016: $650
- 2017: $186
- 2018: $82
- 2019: $295
- 2020: $448
Sources: CMS Medicare Physician & Other Practitioners (2022), CMS Medicare Part D Prescribers (2020), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2021 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, 2017–2022; 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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99285
Emergency department visit with high level of medical decision making
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105 | 105 | $879.89 | $177.65 |
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99284
Emergency department visit with moderate level of medical decision making
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29 | 29 | $633.62 | $122.39 |
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93010
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only
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22 | 22 | $37.00 | $8.25 |
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99291
Critical care, first 30-74 minutes
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11 | 11 | $1097.82 | $218.38 |
Source: CMS Part B by Provider and Service, 2022; 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 2020.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 18 | 53 | $132.67 | 17 |
| Prednisone | Prednisone | 16 | 115 | $72.65 | 15 |
| Azithromycin | Azithromycin | 15 | 75 | $88.36 | 15 |
| Cephalexin | Cephalexin | 11 | 85 | $72.50 | 11 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 11 | 78 | $82.00 | 11 |
Source: CMS Part D by Provider and Drug, 2020; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207P00000X
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Emergency Medicine
Doctor of Osteopathic Medicine (D.O.)
Emergency Medicine
Doctor of Osteopathic Medicine (D.O.)
Physician Assistant
Physician Assistant (Certified)
Emergency Medicine
Doctor of Medicine (M.D.)
Physician Assistant
Physician Assistant (Certified)
Emergency Medicine
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History
NPI enumerated January 10, 2006.
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 Emergency Medicine Providers in Lewes
- Dr. Harold Spangler, MD
- Dr. Lindsay Albanese, MD
- Dr. Kevin Bristowe, MD
- Dr. Joydeep Haldar, MD
- Dr. Claude Lavallee, MD
- Dr. Paul Cowan, DO
Mailing Address
Po Box 3012
Wilmington, DE 19804
Phone: 3022245678