Stacy L Walker , ARNP
Nurse Practitioner โข Ottumwa, IA
522 N Hancock St
Ottumwa, IA 525014231
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 July 27, 2006; this date does not establish years in practice.
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Published CMS data list 12 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99284 โ Emergency department visit with moderate level of medical decision making: 12 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ 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 ยท Guide: How to read Medicare Part B data
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Published CMS data list 680 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Prednisone โ 97 prescription fills, including refills.
- Cephalexin โ 63 prescription fills, including refills.
- Doxycycline Hyclate โ 53 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 26 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in Iowa (2024, 665 clinicians with data). Median for this group: 340. Middle half: 121 to 815.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 4,706 in 2019 to 12 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2019โ2024.
Practice Location & Contact Primary Location
522 N Hancock St
Ottumwa, IA 525014231
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 2 distinct group names: Jefferson County Hospital; Mercy Medical Center-Centerville. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
2001
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
31 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 โ by Provider, 2024.
Medicare-allowed amount
About $1,129 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 โ by Provider and Service, 2024.
Paid by Medicare
About $824 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 โ by Provider and Service, 2024.
30-day fills
691 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
$11,575 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 โ by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $40.12 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
Years since graduation
25 years (graduated 2001)
CMS Doctors and Clinicians data list 2001 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, CMS release of October 2, 2026.
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, CMS release of October 2, 2026; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
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, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Stacy Walker 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 Stacy Walker 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 Ottumwa and Iowa
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 95% of clinicians listed under Nurse Practitioner in Iowa (2024, 665 clinicians with data). Median for this group: 340. Middle half: 121 to 815.
Too few clinicians listed under Nurse Practitioner in Ottumwa have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 95% of clinicians listed under Nurse Practitioner in Iowa (2024, 665 clinicians with data). Median for this group: $22,618. Middle half: $9,384 to $48,238.
Too few clinicians listed under Nurse Practitioner in Ottumwa have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 95% of clinicians listed under Nurse Practitioner in Iowa (2024, 665 clinicians with data). Median for this group: $16,811. Middle half: $6,614 to $35,804.
Too few clinicians listed under Nurse Practitioner in Ottumwa have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Fewer Part D prescriptions than 60% of clinicians listed under Nurse Practitioner in Ottumwa, IA (2024, 11 clinicians with data). Median for this group: 860. Middle half: 188 to 2,572.
Close to the middle for clinicians listed under Nurse Practitioner in Iowa (2024, 751 clinicians with data). Median for this group: 512. Middle half: 126 to 1,961.
Part D drug cost
A lower Part D drug cost than 70% of clinicians listed under Nurse Practitioner in Ottumwa, IA (2024, 11 clinicians with data). Median for this group: $36,472. Middle half: $6,396 to $187,966.
Close to the middle for clinicians listed under Nurse Practitioner in Iowa (2024, 751 clinicians with data). Median for this group: $25,169. Middle half: $1,319 to $227,287.
21 active clinicians are listed under Nurse Practitioner with a practice address in Ottumwa, IA (1,304 in Iowa).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Ottumwa
0% of these 21 clinicians have the CMS telehealth indicator.
52.4% of these 21 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 100% from 4,706 in 2019 to 12 in 2024.
- 2019: 4,706
- 2020: 991
- 2021: 37
- 2023: 11
- 2024: 12
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Medicare-allowed amount
Medicare-allowed amount decreased 99% from $128,694 in 2019 to $1,129 in 2024.
- 2019: $128,694
- 2020: $27,032
- 2021: $4,301
- 2023: $1,529
- 2024: $1,129
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Paid by Medicare
Paid by Medicare decreased 99% from $99,945 in 2019 to $824 in 2024.
- 2019: $99,945
- 2020: $14,973
- 2021: $3,216
- 2023: $1,218
- 2024: $824
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 95% from 13,184 in 2020 to 680 in 2024.
- 2020: 13,184
- 2021: 12,489
- 2022: 8,076
- 2023: 1,505
- 2024: 680
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30-day fills
30-day fills decreased 97% from 23,460 in 2020 to 691 in 2024.
- 2020: 23,460
- 2021: 22,370
- 2022: 14,164
- 2023: 1,701
- 2024: 691
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Part D drug cost
Part D drug cost decreased 98% from $727,696 in 2020 to $11,575 in 2024.
- 2020: $727,696
- 2021: $731,248
- 2022: $475,240
- 2023: $22,951
- 2024: $11,575
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2024 only.
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท 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 2024 (payments made January 1 โ December 31, 2024): fewer than 11 records totaling $40.12.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Abbott Laboratories |
Food and Beverage
In-kind items and services
|
FREESTYLE LIBRE 3 | General | $40.12 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 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 โ by Provider and Service data, 2017โ2024; 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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99284
Emergency department visit with moderate level of medical decision making
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12 | 12 | $843.00 | $94.08 |
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 |
|---|---|---|---|---|---|
| Prednisone | Prednisone | 97 | 693 | $161.67 | 91 |
| Cephalexin | Cephalexin | 63 | 586 | $500.40 | 60 |
| Doxycycline Hyclate | Doxycycline Hyclate | 53 | 436 | $453.39 | 51 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 47 | 266 | $259.11 | 46 |
| Azithromycin | Azithromycin | 46 | 226 | $174.92 | 46 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 39 | 371 | $380.63 | 37 |
| Amoxicillin | Amoxicillin | 27 | 258 | $65.08 | 27 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 27 | 158 | $82.18 | 26 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 26 | 532 | $638.02 | 20 |
| Fluconazole | Fluconazole | 20 | 72 | $146.00 | 17 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 19 | 236 | $72.76 | 18 |
| Nystatin | Nystatin | 18 | 255 | $239.18 | 15 |
| Polymyxin B Sul-Trimethoprim | Polymyxin B Sulf/Trimethoprim | 18 | 362 | $132.47 | 18 |
| Metoprolol Succinate | Metoprolol Succinate | 16 | 606 | $119.07 | โ |
| Ondansetron Odt | Ondansetron | 16 | 57 | $116.20 | 16 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 15 | 53 | $87.85 | 15 |
| Eliquis | Apixaban | 15 | 430 | $7,193.89 | โ |
| Levofloxacin | Levofloxacin | 14 | 95 | $48.13 | 12 |
| Losartan Potassium | Losartan Potassium | 14 | 546 | $39.17 | โ |
| Valacyclovir | Valacyclovir Hcl | 14 | 94 | $255.18 | 12 |
| Paxlovid | Nirmatrelvir/Ritonavir | 14 | 70 | $0.00 | 14 |
| Ondansetron Hcl | Ondansetron Hcl | 13 | 39 | $14.37 | โ |
| Cefdinir | Cefdinir | 13 | 130 | $212.37 | 13 |
| Verapamil Er | Verapamil Hcl | 12 | 366 | $53.93 | โ |
| Letrozole | Letrozole | 12 | 366 | $85.55 | โ |
(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: 2024-01-22NUCC 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.
NUCC Taxonomy Code: 363LF0000X
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20070306000344
IA
1658474028
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, CMS release of October 2, 2026
Jefferson County Hospital
2000 S Main St, Fairfield, IA 525569572
Phone: 6414724111
Mercy Medical Center-Centerville
522 N Hancock St, Ottumwa, IA 525014231
Phone: 6416830800
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Advanced Registered Nurse Practitioner
Nurse Practitioner - Family
Advanced Registered Nurse Practitioner
Nurse Practitioner - Family
Nurse Practitioner (Certified)
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Nurse Practitioner - Family
Advanced Registered Nurse Practitioner
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Recorded as STACY WALKER, ARNP
NPI status registered as active in NPPES database
Registered at 522 N HANCOCK ST, OTTUMWA, IA 525014231 (Tel: 6416824594)
Registered at PO BOX 1475, DES MOINES, IA 503051475 (Tel: 6416824594)
Recorded as STACY GREINER, ARNP
Nurse Practitioner (license number reported to NPPES: IA A087201)
Registered at 522 N HANCOCK ST, OTTUMWA, IA 525014231 (Tel: 6416824594)
NPI status registered as active in NPPES database
Registered at 1005 PENNSYLVANIA AVE., SUITE 104, OTTUMWA, IA 525016408 (Tel: 6416824594)
Registered at PO BOX 1475, DES MOINES, IA 503051475 (Tel: 6416824594)
Recorded as STACY GREINER, ARNP
Nurse Practitioner (license number reported to NPPES: IA A087201)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Ottumwa
- Dr. Cassaundra Mutum, DNP, ARNP-C
- Holly Dunlavy, ARNP
- Sheila Kauzlarich, ARNP
- Jasmine Benson, ARNP
- Cynthia Wurr, ARNP
- Sheryl Mulder, ARNP MSN FNPC
Mailing Address
Po Box 1475
Des Moines, IA 503051475
Phone: 6416830800