Mattie Joy Testroet , ARNP
Nurse Practitioner • Waterloo, IA
3530 W 4th St
Waterloo, IA 507014503
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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Mattie Testroet is listed in NPPES under Nurse Practitioner.
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NPI assigned on June 26, 2015; this date does not establish years in practice.
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Published CMS data list 1,244 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:
- G2211 — Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's: 548 service units.
- 99214 — Established patient outpatient office visit: 493 service units.
- 99213 — Established patient outpatient office visit: 141 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 1,419 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 — 202 prescription fills, including refills.
- Letrozole — 166 prescription fills, including refills.
- Hydroxyurea — 149 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 36 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 65% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 64 clinicians with data). Median for this group: 541. Middle half: 171 to 1,408.
More Medicare Part B services than 80% of clinicians listed under Nurse Practitioner in Iowa (2024, 671 clinicians with data). Median for this group: 338. Middle half: 121 to 805.
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 266 in 2020 to 1,244 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
3530 W 4th St
Waterloo, IA 507014503
CMS Doctors and Clinicians lists 1 group name: Allen Memorial Hospital Corporation. 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
2015
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
429 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 $58,998 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 $43,840 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
2,363 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
$1,713,332 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: $132.23 across 5 records.
By nature of payment
- Food and Beverage: $132.23 across 5 records.
Reporting-company totals
- Incyte Corporation: $57.73 across 3 records.
- Gilead Sciences, Inc.: $54.33 across 1 record.
- Janssen Pharmaceuticals, Inc: $20.17 across 1 record.
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
11 years (graduated 2015)
CMS Doctors and Clinicians data list 2015 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
2015
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.
May accept Medicare assignment
CMS data show this clinician may accept Medicare assignment. Clinicians who do not always accept assignment can decide case by case.
Ask the office before your visit. If a clinician does not accept assignment for a service, they can charge up to 15% more than the Medicare-approved amount, and you may be asked to pay the full amount at the visit.
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?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Mattie Testroet 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 Mattie Testroet 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 Waterloo and Iowa
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 65% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 64 clinicians with data). Median for this group: 541. Middle half: 171 to 1,408.
More Medicare Part B services than 80% of clinicians listed under Nurse Practitioner in Iowa (2024, 671 clinicians with data). Median for this group: 338. Middle half: 121 to 805.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 64 clinicians with data). Median for this group: $34,862. Middle half: $14,286 to $81,637.
A higher Medicare-allowed amount than 75% of clinicians listed under Nurse Practitioner in Iowa (2024, 671 clinicians with data). Median for this group: $22,618. Middle half: $9,190 to $48,097.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 64 clinicians with data). Median for this group: $25,396. Middle half: $10,725 to $60,299.
A higher Medicare payment amount than 80% of clinicians listed under Nurse Practitioner in Iowa (2024, 671 clinicians with data). Median for this group: $16,808. Middle half: $6,606 to $35,763.
Medicare Part D prescriptions
More Part D prescriptions than 65% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 65 clinicians with data). Median for this group: 512. Middle half: 85 to 3,327.
More Part D prescriptions than 65% of clinicians listed under Nurse Practitioner in Iowa (2024, 756 clinicians with data). Median for this group: 483. Middle half: 123 to 1,956.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Nurse Practitioner in Waterloo, IA (2024, 65 clinicians with data). Median for this group: $18,385. Middle half: $2,373 to $456,401.
A higher Part D drug cost than 95% of clinicians listed under Nurse Practitioner in Iowa (2024, 756 clinicians with data). Median for this group: $24,605. Middle half: $1,324 to $225,033.
96 active clinicians are listed under Nurse Practitioner with a practice address in Waterloo, IA (1,294 in Iowa).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Waterloo
16.7% of these 96 clinicians have the CMS telehealth indicator.
54.2% of these 96 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 368% from 266 in 2020 to 1,244 in 2024.
- 2020: 266
- 2021: 773
- 2022: 777
- 2023: 702
- 2024: 1,244
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Medicare-allowed amount
Medicare-allowed amount increased 248% from $16,962 in 2020 to $58,998 in 2024.
- 2020: $16,962
- 2021: $58,337
- 2022: $55,370
- 2023: $50,433
- 2024: $58,998
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Paid by Medicare
Paid by Medicare increased 229% from $13,316 in 2020 to $43,840 in 2024.
- 2020: $13,316
- 2021: $44,808
- 2022: $39,134
- 2023: $36,227
- 2024: $43,840
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 207% from 462 in 2020 to 1,419 in 2024.
- 2020: 462
- 2021: 880
- 2022: 1,346
- 2023: 1,323
- 2024: 1,419
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30-day fills
30-day fills increased 308% from 579 in 2020 to 2,363 in 2024.
- 2020: 579
- 2021: 1,344
- 2022: 2,213
- 2023: 2,301
- 2024: 2,363
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Part D drug cost
Part D drug cost increased 17960% from $9,487 in 2020 to $1,713,332 in 2024.
- 2020: $9,487
- 2021: $656,778
- 2022: $1,491,831
- 2023: $1,070,072
- 2024: $1,713,332
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $12.72 in 2021 to $132.23 in 2025.
- 2021: $12.72
- 2022: $263.23
- 2023: $51.90
- 2024: $226.19
- 2025: $132.23
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 $132.23.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
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Trodelvy | General | $54.33 |
| Incyte Corporation |
Food and Beverage
Cash or cash equivalent
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— | General | $26.32 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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ERLEADA | General | $20.17 |
| Incyte Corporation |
Food and Beverage
Cash or cash equivalent
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ZYNYZ | General | $17.66 |
| Incyte Corporation |
Food and Beverage
Cash or cash equivalent
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— | General | $13.75 |
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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G2211
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
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548 | 371 | $39.00 | $13.00 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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493 | 290 | $98.54 | $76.35 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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141 | 128 | $71.06 | $52.07 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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51 | 41 | $134.51 | $112.69 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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11 | 11 | $141.27 | $104.01 |
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 |
|---|---|---|---|---|---|
| Anastrozole | Anastrozole | 202 | 15,589 | $4,956.02 | 71 |
| Letrozole | Letrozole | 166 | 11,665 | $3,921.98 | 50 |
| Hydroxyurea | Hydroxyurea | 149 | 5,885 | $2,613.53 | 28 |
| Tamoxifen Citrate | Tamoxifen Citrate | 110 | 7,237 | $2,522.97 | 33 |
| Prednisone | Prednisone | 76 | 2,519 | $345.42 | 33 |
| Acyclovir | Acyclovir | 53 | 1,772 | $513.69 | 14 |
| Abiraterone Acetate | Abiraterone Acetate | 51 | 1,530 | $160,626.90 | — |
| Gabapentin | Gabapentin | 50 | 2,373 | $961.57 | 16 |
| Eliquis | Apixaban | 42 | 1,730 | $32,985.60 | 11 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 35 | 1,169 | $145.88 | — |
| Omeprazole | Omeprazole | 30 | 1,158 | $230.76 | — |
| Ondansetron Hcl | Ondansetron Hcl | 30 | 319 | $274.18 | 21 |
| Prochlorperazine Maleate | Prochlorperazine Maleate | 30 | 384 | $430.86 | 21 |
| Levothyroxine Sodium | Levothyroxine Sodium | 29 | 975 | $135.52 | — |
| Furosemide | Furosemide | 26 | 1,310 | $76.67 | — |
| Duloxetine Hcl | Duloxetine Hcl | 23 | 1,710 | $480.87 | — |
| Lenalidomide | Lenalidomide | 23 | 644 | $371,865.89 | — |
| Pantoprazole Sodium | Pantoprazole Sodium | 22 | 1,030 | $137.15 | — |
| Diphenoxylate-Atropine | Diphenoxylate Hcl/Atropine | 20 | 246 | $267.80 | 13 |
| Dexamethasone | Dexamethasone | 20 | 515 | $307.28 | 13 |
| Hydrocortisone | Hydrocortisone | 19 | 548 | $249.41 | 11 |
| Revlimid | Lenalidomide | 19 | 525 | $438,386.56 | — |
| Oxycodone Hcl | Oxycodone Hcl | 18 | 339 | $284.66 | — |
| Klor-Con M20 | Potassium Chloride | 17 | 840 | $188.35 | — |
| Potassium Chloride | Potassium Chloride | 17 | 1,025 | $455.38 | — |
(top 25 shown)
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: 2025-05-13NUCC 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
I20150814013321
IA
5991010340
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
Allen Memorial Hospital Corporation
3530 W 4th St, Waterloo, IA 507014503
Phone: 3192332701
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
Advanced Registered Nurse Practitioner
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 3530 W 4TH ST, WATERLOO, IA 507014503 (Tel: 3192332701)
Registered at 3530 W 4TH ST, WATERLOO, IA 507014503 (Tel: 3192332701)
NPI status registered as active in NPPES database
Registered at 419 E DONALD ST, WATERLOO, IA 507031500 (Tel: 3192361911)
Registered at PO BOX 2758, 4150 KIMBALL AVENUE, WATERLOO, IA 507042758 (Tel: 3192355390)
Recorded as MATTIE TESTROET, ARNP
Nurse Practitioner (license number reported to NPPES: IA A122571)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Waterloo
- Diane Young, ARNP
- Sarah Mahipala, FNP-C
- Dawn Higgins, ARNP
- Gorana Zekanovic, ARNP
- Kayln Boge-Kleiss, ARNP
- Emma Koester, ARNP
Mailing Address
3530 W 4th St
Waterloo, IA 507014503
Phone: 3192332701