Sierra Robertson
Physician Assistant โข Walla Walla, WA
401 W Poplar St
Walla Walla, WA 993622846
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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Sierra Robertson is listed in NPPES under Physician Assistant.
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NPI assigned on March 18, 2021; this date does not establish years in practice.
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Published CMS data list 311 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:
- 99214 โ Established patient outpatient office visit: 232 service units.
- G2211 โ 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: 46 service units.
- 93280 โ Programming of dual lead pacemaker system: 20 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 767 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:
- Metoprolol Succinate โ 112 prescription fills, including refills.
- Eliquis (Apixaban) โ 106 prescription fills, including refills.
- Atorvastatin Calcium โ 102 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 20 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 70% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: 434. Middle half: 208 to 1,627.
More Medicare Part B services than 60% of clinicians listed under Physician Assistant in Washington (2024, 1,713 clinicians with data). Median for this group: 218. Middle half: 77 to 481.
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 262 in 2021 to 311 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2024.
Practice Location & Contact Primary Location
401 W Poplar St
Walla Walla, WA 993622846
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: Providence Health And Services - Washington. 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
2020
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
208 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 $28,564 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 $19,546 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
1,735 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
$204,627 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.
Open Payments general payments, program year 2025
All general payments: $340.90 across 4 records.
By nature of payment
- Food and Beverage: $340.90 across 4 records.
Reporting-company totals (3 largest of 4)
- Medtronic, Inc.: $130.47 across 1 record.
- ABIOMED: $98.06 across 1 record.
- Novartis Pharmaceuticals Corporation: $84.38 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
6 years (graduated 2020)
CMS Doctors and Clinicians data list 2020 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
2021
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)
Sierra Robertson 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 Sierra Robertson 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 Walla Walla and Washington
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 70% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: 434. Middle half: 208 to 1,627.
More Medicare Part B services than 60% of clinicians listed under Physician Assistant in Washington (2024, 1,713 clinicians with data). Median for this group: 218. Middle half: 77 to 481.
Medicare-allowed amount
A lower Medicare-allowed amount than 70% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: $41,015. Middle half: $19,812 to $105,392.
A higher Medicare-allowed amount than 65% of clinicians listed under Physician Assistant in Washington (2024, 1,713 clinicians with data). Median for this group: $17,161. Middle half: $6,883 to $34,686.
Paid by Medicare
A lower Medicare payment amount than 70% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: $30,384. Middle half: $14,272 to $73,549.
A higher Medicare payment amount than 65% of clinicians listed under Physician Assistant in Washington (2024, 1,713 clinicians with data). Median for this group: $12,607. Middle half: $4,861 to $25,329.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: 551. Middle half: 199 to 698.
More Part D prescriptions than 70% of clinicians listed under Physician Assistant in Washington (2024, 2,003 clinicians with data). Median for this group: 246. Middle half: 75 to 798.
Part D drug cost
A higher Part D drug cost than 80% of clinicians listed under Physician Assistant in Walla Walla, WA (2024, 11 clinicians with data). Median for this group: $26,596. Middle half: $4,337 to $149,882.
A higher Part D drug cost than 85% of clinicians listed under Physician Assistant in Washington (2024, 2,003 clinicians with data). Median for this group: $4,375. Middle half: $766 to $64,886.
27 active clinicians are listed under Physician Assistant with a practice address in Walla Walla, WA (3,812 in Washington).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Walla Walla
7.4% of these 27 clinicians have the CMS telehealth indicator.
59.3% of these 27 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 19% from 262 in 2021 to 311 in 2024.
- 2021: 262
- 2022: 270
- 2023: 310
- 2024: 311
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $27,233 in 2021 and $28,564 in 2024.
- 2021: $27,233
- 2022: $29,230
- 2023: $32,236
- 2024: $28,564
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Paid by Medicare
Paid by Medicare stayed about the same: $21,140 in 2021 and $19,546 in 2024.
- 2021: $21,140
- 2022: $20,210
- 2023: $24,681
- 2024: $19,546
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 610% from 108 in 2021 to 767 in 2024.
- 2021: 108
- 2022: 403
- 2023: 442
- 2024: 767
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30-day fills
30-day fills increased 1016% from 156 in 2021 to 1,735 in 2024.
- 2021: 156
- 2022: 761
- 2023: 978
- 2024: 1,735
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Part D drug cost
Part D drug cost increased 970% from $19,121 in 2021 to $204,627 in 2024.
- 2021: $19,121
- 2022: $58,543
- 2023: $90,529
- 2024: $204,627
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $15.42 in 2024 to $340.90 in 2025.
- 2024: $15.42
- 2025: $340.90
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), 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 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $340.90.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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SYMPLICITY G3 | General | $130.47 |
| ABIOMED |
Food and Beverage
In-kind items and services
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โ | General | $98.06 |
| Novartis Pharmaceuticals Corporation |
Food and Beverage
In-kind items and services
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LEQVIO | General | $84.38 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $27.99 |
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 2020โ2023 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, 2021โ2024; 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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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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232 | 192 | $391.00 | $107.96 |
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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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46 | 43 | $46.00 | $13.75 |
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93280
Programming of dual lead pacemaker system
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20 | 19 | $165.80 | $44.98 |
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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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13 | 13 | $546.00 | $152.72 |
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 |
|---|---|---|---|---|---|
| Metoprolol Succinate | Metoprolol Succinate | 112 | 7,886 | $1,694.69 | 32 |
| Eliquis | Apixaban | 106 | 5,863 | $110,677.41 | 26 |
| Atorvastatin Calcium | Atorvastatin Calcium | 102 | 7,020 | $795.76 | 29 |
| Lisinopril | Lisinopril | 69 | 4,230 | $434.88 | 19 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 54 | 3,900 | $1,117.32 | 16 |
| Amlodipine Besylate | Amlodipine Besylate | 45 | 3,390 | $396.90 | 14 |
| Losartan Potassium | Losartan Potassium | 36 | 2,610 | $402.53 | 11 |
| Metoprolol Tartrate | Metoprolol Tartrate | 34 | 2,595 | $157.60 | 11 |
| Xarelto | Rivaroxaban | 27 | 2,430 | $42,081.11 | โ |
| Furosemide | Furosemide | 27 | 1,830 | $243.71 | โ |
| Potassium Chloride | Potassium Chloride | 25 | 1,920 | $454.38 | โ |
| Ezetimibe | Ezetimibe | 22 | 1,560 | $488.40 | โ |
| Flecainide Acetate | Flecainide Acetate | 17 | 692 | $424.41 | โ |
| Entresto | Sacubitril/Valsartan | 17 | 765 | $16,554.19 | โ |
| Digoxin | Digoxin | 15 | 570 | $150.03 | โ |
| Diltiazem 24hr Er (Cd) | Diltiazem Hcl | 13 | 1,085 | $588.92 | โ |
| Farxiga | Dapagliflozin Propanediol | 12 | 600 | $10,841.34 | โ |
| Jardiance | Empagliflozin | 12 | 900 | $16,914.65 | โ |
| Isosorbide Mononitrate Er | Isosorbide Mononitrate | 11 | 870 | $121.09 | โ |
| Spironolactone | Spironolactone | 11 | 870 | $87.83 | โ |
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: 2021-03-18NUCC 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.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20210330000581
WA
8729495213
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
Providence Health And Services - Washington
380 Chase Ave, Walla Walla, WA 993622924
Phone: 5098973333
Providence Health And Services - Washington
401 W Poplar St, Walla Walla, WA 993622846
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.)
Emergency Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner (Certified)
Nurse Practitioner - Adult Health
Pharmacist
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated March 18, 2021.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from April 2021 to November 2026.
NPI Administrative Meta
Other Physician Assistants in Walla Walla
- Monica Mendoza
- Benjamin Nichols
- Sneh Lalani
- Douglas West, PA-C
- Rochelle Trussell, PA-C
- Derek Sucharda, PA-C
Mailing Address
751 Grandview Ave
College Place, WA 993241436
Phone: 5092007397