Allison Marie Illsley , NP
Nurse Practitioner โข Worcester, MA
55 Lake Ave N
Worcester, MA 016550002
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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Allison Illsley is listed in NPPES under Nurse Practitioner.
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NPI assigned on October 13, 2015; this date does not establish years in practice.
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Published CMS data list 90 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:
- 99292 โ Critical care: 52 service units.
- 99291 โ Critical care: 38 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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Fewer Medicare Part B services than 70% of clinicians listed under Nurse Practitioner in Worcester, MA (2024, 225 clinicians with data). Median for this group: 162. Middle half: 80 to 346.
Fewer Medicare Part B services than 75% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,536 clinicians with data). Median for this group: 293. Middle half: 113 to 625.
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 37 in 2020 to 90 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
55 Lake Ave N
Worcester, MA 016550002
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: Umass Memorial Medical Group Inc. 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
32 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 $11,373 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 $9,061 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.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2021โ2025.
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.
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)
Allison Illsley 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.
Compared with the same specialty in Worcester and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 70% of clinicians listed under Nurse Practitioner in Worcester, MA (2024, 225 clinicians with data). Median for this group: 162. Middle half: 80 to 346.
Fewer Medicare Part B services than 75% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,536 clinicians with data). Median for this group: 293. Middle half: 113 to 625.
Medicare-allowed amount
A lower Medicare-allowed amount than 60% of clinicians listed under Nurse Practitioner in Worcester, MA (2024, 225 clinicians with data). Median for this group: $13,875. Middle half: $6,625 to $26,061.
A lower Medicare-allowed amount than 70% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,536 clinicians with data). Median for this group: $24,187. Middle half: $9,751 to $49,233.
Paid by Medicare
Close to the middle for clinicians listed under Nurse Practitioner in Worcester, MA (2024, 225 clinicians with data). Median for this group: $10,316. Middle half: $4,844 to $19,689.
A lower Medicare payment amount than 70% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,536 clinicians with data). Median for this group: $18,312. Middle half: $7,110 to $37,062.
499 active clinicians are listed under Nurse Practitioner with a practice address in Worcester, MA (3,483 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Worcester
17.8% of these 499 clinicians have the CMS telehealth indicator.
57.7% of these 499 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 143% from 37 in 2020 to 90 in 2024.
- 2020: 37
- 2021: 101
- 2022: 116
- 2023: 16
- 2024: 90
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Medicare-allowed amount
Medicare-allowed amount increased 210% from $3,674 in 2020 to $11,373 in 2024.
- 2020: $3,674
- 2021: $9,846
- 2022: $18,109
- 2023: $2,944
- 2024: $11,373
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Paid by Medicare
Paid by Medicare increased 208% from $2,937 in 2020 to $9,061 in 2024.
- 2020: $2,937
- 2021: $7,900
- 2022: $14,509
- 2023: $2,352
- 2024: $9,061
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
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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99292
Critical care, each additional 30 minutes
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52 | 30 | $404.00 | $89.17 |
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99291
Critical care, first 30-74 minutes
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38 | 32 | $927.00 | $177.26 |
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.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2020-11-10NUCC 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: 363LA2100X
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20160331000560
MA
0840597183
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
Umass Memorial Medical Group Inc
55 Lake Ave N, Worcester, MA 016550002
Phone: 5083341000
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
Nurse Practitioner
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant
Physician Assistant
Physician Assistant (Certified)
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
NPI status registered as active in NPPES database
Registered at 55 LAKE AVE N, WORCESTER, MA 016550002 (Tel: 7744437552)
Registered at PO BOX 415348, BOSTON, MA 022415348 (Tel: 8002258885)
Recorded as ALLISON ILLSLEY, NP
Nurse Practitioner (license number reported to NPPES: MA RN2281827)
NPI status registered as active in NPPES database
Registered at 55 LAKE AVE N, WORCESTER, MA 016550002 (Tel: 7744437552)
Registered at PO BOX 415348, BOSTON, MA 022415348 (Tel: 8002258885)
Recorded as ALLISON ILLSLEY, NP
Nurse Practitioner (license number reported to NPPES: MA RN2281827)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Worcester
- Jeane Ferro, NP
- Mary Linda O'reilly, NP
- Lauri Toohey, ANP
- Elizabeth Digangi, NP
- Jessica Day, NP-C
- Heatherlyn Wilson
Mailing Address
Po Box 415348
Boston, MA 022415348
Phone: 8002258885