Tammy S. Mackiewicz , ARNP
Nurse Practitioner • Spring Hill, FL
7154 Medical Center Dr
Spring Hill, FL 346081329
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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Tammy Mackiewicz is listed in NPPES under Nurse Practitioner.
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NPI assigned on December 29, 2011; this date does not establish years in practice.
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Published CMS data list 60 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:
- Anastrozole — 20 prescription fills, including refills.
- Prednisone — 16 prescription fills, including refills.
- Ondansetron Odt (Ondansetron) — 13 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 4 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 80% of clinicians listed under Nurse Practitioner in Spring Hill, FL (2024, 13 clinicians with data). Median for this group: 409. Middle half: 72 to 1,255.
Fewer Part D prescriptions than 75% of clinicians listed under Nurse Practitioner in Florida (2024, 3,506 clinicians with data). Median for this group: 306. Middle half: 76 to 1,100.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 84 in 2020 to 60 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
7154 Medical Center Dr
Spring Hill, FL 346081329
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: Florida Cancer Specialists And Research Institute, Llc. 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
2011
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
102 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
$562 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: $2,406.80 across 107 records.
By nature of payment
- Food and Beverage: $2,328.81 across 106 records.
- Education: $77.99 across 1 record.
Reporting-company totals (3 largest of 30)
- Novartis Pharmaceuticals Corporation: $249.71 across 16 records.
- Pfizer Inc.: $174.28 across 9 records.
- Bristol Myers Squibb Company: $153.79 across 8 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
15 years (graduated 2011)
CMS Doctors and Clinicians data list 2011 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
2011
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)
Tammy Mackiewicz 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 Tammy Mackiewicz 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 Spring Hill and Florida
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 80% of clinicians listed under Nurse Practitioner in Spring Hill, FL (2024, 13 clinicians with data). Median for this group: 409. Middle half: 72 to 1,255.
Fewer Part D prescriptions than 75% of clinicians listed under Nurse Practitioner in Florida (2024, 3,506 clinicians with data). Median for this group: 306. Middle half: 76 to 1,100.
Part D drug cost
A lower Part D drug cost than 90% of clinicians listed under Nurse Practitioner in Spring Hill, FL (2024, 13 clinicians with data). Median for this group: $17,345. Middle half: $1,548 to $79,119.
A lower Part D drug cost than 80% of clinicians listed under Nurse Practitioner in Florida (2024, 3,506 clinicians with data). Median for this group: $18,227. Middle half: $1,370 to $130,581.
24 active clinicians are listed under Nurse Practitioner with a practice address in Spring Hill, FL (8,853 in Florida).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Spring Hill
4.2% of these 24 clinicians have the CMS telehealth indicator.
58.3% of these 24 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 D prescriptions
Medicare Part D prescriptions decreased 29% from 84 in 2020 to 60 in 2024.
- 2020: 84
- 2021: 60
- 2022: 65
- 2023: 71
- 2024: 60
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30-day fills
30-day fills varied from year to year: 100 in 2020 and 102 in 2024.
- 2020: 100
- 2021: 60
- 2022: 85
- 2023: 111
- 2024: 102
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Part D drug cost
Part D drug cost decreased 87% from $4,197 in 2020 to $562 in 2024.
- 2020: $4,197
- 2021: $14,016
- 2022: $12,459
- 2023: $17,060
- 2024: $562
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Industry payments (Open Payments)
Industry payments (Open Payments) increased 86% from $1,292.27 in 2021 to $2,406.80 in 2025.
- 2021: $1,292.27
- 2022: $2,407.75
- 2023: $2,700.89
- 2024: $2,627.05
- 2025: $2,406.80
Sources: 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): 107 records totaling $2,406.80.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Pfizer Inc. |
Education
In-kind items and services
|
— | General | $77.99 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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CARVYKTI | General | $38.38 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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LIBTAYO | General | $36.16 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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OJJAARA | General | $34.72 |
| Legend Biotech USA Inc. |
Food and Beverage
In-kind items and services
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CARVYKTI | General | $33.86 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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LIBTAYO | General | $32.76 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
— | General | $31.89 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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REBLOZYL | General | $31.83 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
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IBRANCE | General | $31.64 |
| GlaxoSmithKline, LLC. |
Food and Beverage
In-kind items and services
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OJJAARA | General | $31.63 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
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KEYTRUDA | General | $31.55 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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VERZENIO | General | $30.11 |
| EMD Serono, Inc. |
Food and Beverage
Cash or cash equivalent
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— | General | $29.78 |
| Kite Pharma, Inc. |
Food and Beverage
In-kind items and services
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Yescarta | General | $29.47 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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LUTATHERA | General | $29.35 |
| Incyte Corporation |
Food and Beverage
Cash or cash equivalent
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JAKAFI | General | $28.87 |
| Legend Biotech USA Inc. |
Food and Beverage
In-kind items and services
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CARVYKTI | General | $28.50 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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LIBTAYO | General | $28.46 |
| Daiichi Sankyo Inc. |
Food and Beverage
In-kind items and services
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Enhertu | General | $28.21 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
Trodelvy | General | $27.96 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
|
KEYTRUDA | General | $27.91 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
|
TALVEY | General | $27.58 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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EPKINLY | General | $27.47 |
| Merck Sharp & Dohme LLC |
Food and Beverage
In-kind items and services
|
KEYTRUDA | General | $27.36 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
Trodelvy | General | $27.25 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, released June 30, 2026.
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 |
|---|---|---|---|---|---|
| Anastrozole | Anastrozole | 20 | 1,560 | $257.56 | — |
| Prednisone | Prednisone | 16 | 565 | $126.23 | 11 |
| Ondansetron Odt | Ondansetron | 13 | 235 | $110.37 | — |
| Potassium Chloride | Potassium Chloride | 11 | 450 | $67.98 | — |
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: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20150814012888
FL
0749595189
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
Florida Cancer Specialists And Research Institute, Llc
1396 Whisper Cir, Sebring, FL 338701204
Phone: 8633851244
Florida Cancer Specialists And Research Institute, Llc
9320 State Rd, Trinity, FL 346551808
Phone: 7278428411
Florida Cancer Specialists And Research Institute, Llc
14100 Fivay Rd, Hudson, FL 346677181
Phone: 7278629026
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
Master of Science in Nursing, Family Nurse Practitioner (Board Certified)
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Radiology - Radiation Oncology
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Advanced Practice Registered Nurse
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Nurse Practitioner
Career & Practice History
NPI enumerated December 29, 2011.
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 Nurse Practitioners in Spring Hill
- Sheila Martin
- Laura Graham, ARNP
- Katie Romaniecki, APRN
- Suzanne Campbell, ARNP-C
- Alyssa Davis, FNP-BC
- Michelle Schoen, APRN
Mailing Address
4371 Veronica S Shoemaker Blvd, Attn: Credentialing
Fort Myers, FL 339162216
Phone: 2392748200