Olivia Faeth Hasselfeld , PA
Physician Assistant โข O Fallon, MO
2 Progress Point Pkwy, Div Im Medical Oncology
O Fallon, MO 633682205
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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Olivia Hasselfeld is listed in NPPES under Physician Assistant.
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NPI assigned on July 27, 2020; this date does not establish years in practice.
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Published CMS data list 145 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: 104 service units.
- 99222 โ Initial hospital care with straightforward or low-level medical decision making: 41 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 177 Medicare Part D prescriptions, including refills, in 2022.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2022. Published rows only; this is not a quality measure.
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Published Part D records, 2022:
- Prednisone โ 51 prescription fills, including refills.
- Doxycycline Monohydrate โ 25 prescription fills, including refills.
- Azithromycin โ 22 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2022. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 8 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 75% of clinicians listed under Physician Assistant in O Fallon, MO (2024, 14 clinicians with data). Median for this group: 328. Middle half: 154 to 1,258.
Fewer Medicare Part B services than 60% of clinicians listed under Physician Assistant in Missouri (2024, 944 clinicians with data). Median for this group: 229. Middle half: 96 to 567.
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 2,334 in 2021 to 145 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2024.
Practice Location & Contact Primary Location
2 Progress Point Pkwy
Div Im Medical Oncology
O Fallon, MO 633682205
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: Washington University. 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
2020
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
73 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 $10,744 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 $8,450 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
177 standardized 30-day fills in 2022
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
$1,830 in 2022
The total cost of these prescriptions in 2022, 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, 2022.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $137.16 in 2023
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 2023.
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.
NPI first issued
2020
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)
Olivia Hasselfeld 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 Olivia Hasselfeld 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 O Fallon and Missouri
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 75% of clinicians listed under Physician Assistant in O Fallon, MO (2024, 14 clinicians with data). Median for this group: 328. Middle half: 154 to 1,258.
Fewer Medicare Part B services than 60% of clinicians listed under Physician Assistant in Missouri (2024, 944 clinicians with data). Median for this group: 229. Middle half: 96 to 567.
Medicare-allowed amount
A lower Medicare-allowed amount than 75% of clinicians listed under Physician Assistant in O Fallon, MO (2024, 14 clinicians with data). Median for this group: $31,497. Middle half: $11,459 to $63,063.
A lower Medicare-allowed amount than 60% of clinicians listed under Physician Assistant in Missouri (2024, 944 clinicians with data). Median for this group: $16,486. Middle half: $7,632 to $33,529.
Paid by Medicare
A lower Medicare payment amount than 65% of clinicians listed under Physician Assistant in O Fallon, MO (2024, 14 clinicians with data). Median for this group: $25,451. Middle half: $7,925 to $44,495.
A lower Medicare payment amount than 60% of clinicians listed under Physician Assistant in Missouri (2024, 944 clinicians with data). Median for this group: $12,171. Middle half: $5,565 to $25,556.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Olivia Hasselfeld are from 2022.
19 active clinicians are listed under Physician Assistant with a practice address in O Fallon, MO (1,791 in Missouri).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in O Fallon
15.8% of these 19 clinicians have the CMS telehealth indicator.
89.5% of these 19 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 94% from 2,334 in 2021 to 145 in 2024.
- 2021: 2,334
- 2022: 739
- 2023: 157
- 2024: 145
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Medicare-allowed amount
Medicare-allowed amount decreased 61% from $27,725 in 2021 to $10,744 in 2024.
- 2021: $27,725
- 2022: $29,657
- 2023: $12,896
- 2024: $10,744
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Paid by Medicare
Paid by Medicare decreased 65% from $23,956 in 2021 to $8,450 in 2024.
- 2021: $23,956
- 2022: $24,724
- 2023: $10,200
- 2024: $8,450
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 181% from 63 in 2021 to 177 in 2022.
- 2021: 63
- 2022: 177
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30-day fills
30-day fills increased 181% from 63 in 2021 to 177 in 2022.
- 2021: 63
- 2022: 177
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Part D drug cost
Part D drug cost went from $528 in 2021 to $1,830 in 2022.
- 2021: $528
- 2022: $1,830
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $53.20 in 2021 to $137.16 in 2023.
- 2021: $53.20
- 2023: $137.16
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2022), CMS Open Payments (2023), 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 2023 (payments made January 1 โ December 31, 2023): fewer than 11 records totaling $137.16.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
|
SYNCHROMEDII | General | $137.16 |
Source: CMS Open Payments, program year 2023, 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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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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104 | 55 | $227.58 | $62.47 |
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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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41 | 40 | $481.61 | $103.60 |
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 2022.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Prednisone | Prednisone | 51 | 325 | $121.59 | 51 |
| Doxycycline Monohydrate | Doxycycline Monohydrate | 25 | 214 | $374.92 | 25 |
| Azithromycin | Azithromycin | 22 | 110 | $176.16 | 22 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 21 | 177 | $267.27 | 21 |
| Cephalexin | Cephalexin | 17 | 141 | $127.03 | 17 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 15 | 246 | $513.99 | 15 |
| Paxlovid (Eua) | Nirmatrelvir/Ritonavir | 14 | 70 | $131.12 | 14 |
| Mupirocin | Mupirocin | 12 | 93 | $118.38 | 12 |
Source: CMS Part D by Provider and Drug, 2022; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-12-19NUCC 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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20210217002450
MO
9335554765
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
Washington University
10 Hospital Dr, Saint Peters, MO 633761659
Phone: 8006472098
Washington University
11133 Dunn Rd, Saint Louis, MO 631366163
Phone: 3143627603
Washington University
10 Hospital Dr Mob, St Peters, MO 633761659
Phone: 8006472098
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 Nurse Practitioner
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Nurse Practitioner - Gerontology
Adult-Gerontology Nurse Practitioner
Nurse Practitioner
Adult Nurse Practitioner
Internal Medicine - Medical 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 PO BOX 7412011, CHICAGO, IL 606742011 (Tel: 8006472098)
Registered at 2 PROGRESS POINT PKWY, DIV IM MEDICAL ONCOLOGY, O FALLON, MO 633682205 (Tel: 8006472098)
Registered at PO BOX 60352, SAINT LOUIS, MO 631600352 (Tel: 8006472098)
Registered at 1255 GRAHAM RD STE 101, FLORISSANT, MO 630318014 (Tel: 3148206800)
Recorded as OLIVIA HASSELFELD, PA
Registered at 660 S EUCLID AVE, MSC 8056-507-01, SAINT LOUIS, MO 631101010 (Tel: 8006472098)
Registered at 2 PROGRESS POINT PKWY, DIV IM MEDICAL ONCOLOGY, O FALLON, MO 633682205 (Tel: 8006472098)
Registered at 660 S EUCLID AVE, CB 8056, SAINT LOUIS, MO 631101010 (Tel: 3147471171)
Recorded as OLIVIA LANGLEY, PA
Physician Assistant (license number reported to NPPES: MO 2020026369)
Registered at 1255 GRAHAM RD STE 101, FLORISSANT, MO 630318014 (Tel: 3148206800)
Registered at 660 S EUCLID AVE, SAINT LOUIS, MO 631101010 (Tel: 3148206800)
NPI status registered as active in NPPES database
Registered at 507 KENILWORTH LN, BALLWIN, MO 630112433 (Tel: 4178185616)
Registered at 507 KENILWORTH LN, BALLWIN, MO 630112433 (Tel: 4178185616)
Recorded as OLIVIA LANGLEY, PA-C
Physician Assistant (license number reported to NPPES: IL 085.007851)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in O Fallon
- Jeneffer Avalos Topete, PA
- Natasha Fresenburg, PA-C
- Krista Jenkins, PA
- Rebecca Smith, PA-C
- Casey Wegener, PA-C
- Mariah White, PA-C
Mailing Address
Po Box 7412011
Chicago, IL 606742011
Phone: 8006472098