Margaret Ann Walker , PA-C
Physician Assistant โข Seattle, WA
1550 N 115th St
Seattle, WA 981338401
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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Margaret Walker is listed in NPPES under Physician Assistant.
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NPI assigned on October 18, 2012; this date does not establish years in practice.
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Published CMS data list 319 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:
- 99232 โ Subsequent hospital care with moderate levelof medical decision making: 185 service units.
- 99222 โ Initial hospital care with straightforward or low-level medical decision making: 61 service units.
- 99223 โ Initial hospital care with moderate level of medical decision making: 51 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 all 4 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 159 Medicare Part D prescriptions, including refills, in 2017.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2017. Published rows only; this is not a quality measure.
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Published Part D records, 2017:
- Esomeprazole Magnesium โ 29 prescription fills, including refills.
- Xifaxan (Rifaximin) โ 27 prescription fills, including refills.
- Pantoprazole Sodium โ 26 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2017. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 70% of clinicians listed under Physician Assistant in Seattle, WA (2024, 354 clinicians with data). Median for this group: 148. Middle half: 56 to 321.
More Medicare Part B services than 60% of clinicians listed under Physician Assistant in Washington (2024, 1,707 clinicians with data). Median for this group: 218. Middle half: 77 to 474.
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 153 in 2020 to 319 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
1550 N 115th St
Seattle, WA 981338401
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: The Association Of University Physicians. 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
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
166 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 $29,950 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 $23,845 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
187 standardized 30-day fills in 2017
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
$593,077 in 2017
The total cost of these prescriptions in 2017, 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, 2017.
Open Payments general payments, program year 2025
All general payments: $88.64 across 2 records.
By nature of payment
- Food and Beverage: $88.64 across 2 records.
Reporting-company totals
- Madrigal Pharmaceuticals: $74.09 across 1 record.
- Aimmune Therapeutics, Inc.: $14.55 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
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
2012
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, 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.
Enrolled in Medicare (PECOS)
Margaret 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 Margaret 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 Seattle and Washington
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 70% of clinicians listed under Physician Assistant in Seattle, WA (2024, 354 clinicians with data). Median for this group: 148. Middle half: 56 to 321.
More Medicare Part B services than 60% of clinicians listed under Physician Assistant in Washington (2024, 1,707 clinicians with data). Median for this group: 218. Middle half: 77 to 474.
Medicare-allowed amount
A higher Medicare-allowed amount than 80% of clinicians listed under Physician Assistant in Seattle, WA (2024, 354 clinicians with data). Median for this group: $13,493. Middle half: $5,394 to $24,568.
A higher Medicare-allowed amount than 70% of clinicians listed under Physician Assistant in Washington (2024, 1,707 clinicians with data). Median for this group: $16,952. Middle half: $6,879 to $34,613.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Physician Assistant in Seattle, WA (2024, 354 clinicians with data). Median for this group: $9,797. Middle half: $3,900 to $18,525.
A higher Medicare payment amount than 70% of clinicians listed under Physician Assistant in Washington (2024, 1,707 clinicians with data). Median for this group: $12,488. Middle half: $4,857 to $25,122.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Margaret Walker are from 2017.
828 active clinicians are listed under Physician Assistant with a practice address in Seattle, WA (3,718 in Washington).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Seattle
19% of these 828 clinicians have the CMS telehealth indicator.
67.3% of these 828 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 108% from 153 in 2020 to 319 in 2024.
- 2020: 153
- 2021: 130
- 2022: 282
- 2023: 339
- 2024: 319
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Medicare-allowed amount
Medicare-allowed amount increased 126% from $13,227 in 2020 to $29,950 in 2024.
- 2020: $13,227
- 2021: $11,438
- 2022: $21,423
- 2023: $27,679
- 2024: $29,950
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Paid by Medicare
Paid by Medicare increased 143% from $9,805 in 2020 to $23,845 in 2024.
- 2020: $9,805
- 2021: $8,942
- 2022: $16,910
- 2023: $22,053
- 2024: $23,845
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Medicare Part D prescriptions
Medicare Part D prescriptions went from 11 in 2014 to 159 in 2017.
- 2014: 11
- 2015: 103
- 2016: 66
- 2017: 159
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30-day fills
30-day fills went from 11 in 2014 to 187 in 2017.
- 2014: 11
- 2015: 125
- 2016: 78
- 2017: 187
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Part D drug cost
Part D drug cost increased 640% from $80,101 in 2014 to $593,077 in 2017.
- 2014: $80,101
- 2015: $1,822
- 2016: $551,475
- 2017: $593,077
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $273.02 in 2023 to $88.64 in 2025.
- 2023: $273.02
- 2025: $88.64
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2017), CMS Open Payments (2025), CMS Doctors and Clinicians, 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 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $88.64.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
|
REZDIFFRA | General | $74.09 |
| Aimmune Therapeutics, Inc. |
Food and Beverage
In-kind items and services
|
VOWST | General | $14.55 |
Source: CMS Open Payments, program year 2025, 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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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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185 | 103 | $243.78 | $69.31 |
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99222
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
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61 | 59 | $401.24 | $114.84 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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51 | 44 | $534.68 | $154.43 |
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99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
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22 | 19 | $369.25 | $102.13 |
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 2017.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Esomeprazole Magnesium | Esomeprazole Magnesium | 29 | 1,050 | $3,061.23 | โ |
| Xifaxan | Rifaximin | 27 | 844 | $58,418.03 | โ |
| Pantoprazole Sodium | Pantoprazole Sodium | 26 | 780 | $289.15 | โ |
| Omeprazole | Omeprazole | 25 | 841 | $254.81 | โ |
| Alosetron Hcl | Alosetron Hcl | 22 | 600 | $29,902.15 | โ |
| Creon | Lipase/Protease/Amylase | 16 | 923 | $52,027.51 | โ |
| Harvoni | Ledipasvir/Sofosbuvir | 14 | 392 | $449,123.70 | โ |
Source: CMS Part D by Provider and Drug, 2017; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2021-08-02NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
NUCC Taxonomy Code: 363AM0700X
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20130225000097
WA
9335394360
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
The Association Of University Physicians
1550 N 115th St, Seattle, WA 981338401
Phone: 2063640500
The Association Of University Physicians
1701 Columbia Rd, Seattle, WA 981950001
Phone: 2065983100
The Association Of University Physicians
1959 Ne Pacific St, Seattle, WA 981950001
Phone: 2065984333
The Association Of University Physicians
1570 N 115th St, Seattle, WA 981338401
Phone: 2063062800
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 - Transplant Hepatology
Doctor of Medicine (M.D.)
Nurse Practitioner
Advanced Registered Nurse Practitioner
Internal Medicine
Nurse Practitioner
Advanced Registered Nurse Practitioner
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Internal Medicine
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 1550 N 115TH ST, SEATTLE, WA 981338401 (Tel: 2065205000)
Registered at PO BOX 50095, SEATTLE, WA 981455095 (Tel: 2065205700)
Physician Assistant (license number reported to NPPES: WA PA60267720)
NPI status registered as active in NPPES database
Registered at 1624 S I ST, SUITE 305, TACOMA, WA 984055016 (Tel: 2534288700)
Registered at 2920 S MERIDIAN, SUITE 100, PUYALLUP, WA 983731428 (Tel: 2538414296)
Recorded as MARGARET WALKER, PA-C
Physician Assistant (license number reported to NPPES: WA PA60267720)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Seattle
- Amy Johnson, PA-C
- Elizabeth Rudd, PA-C
- Rachel Trouten, PA-C
- Jocelyn Murray, MSPA
- Jaime Charest, PA-C
- Alyssa Jensen
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Directory navigation, in NPI number order.
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Mailing Address
Po Box 50095
Seattle, WA 981455095
Phone: 2065205700