Stephen M Cahill , PA-C
Physician Assistant • Worcester, MA
55 Lake Avenue North, Sicu
Worcester, MA 01655
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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Stephen Cahill is listed in NPPES under Physician Assistant.
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NPI assigned on December 6, 2006; this date does not establish years in practice.
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Published CMS data list 170 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – 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 — Critical care: 111 service units.
- 99291 — Critical care: 59 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® 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 · Guide: How to read Medicare Part B data
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Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in Worcester, MA (2024, 226 clinicians with data). Median for this group: 174. Middle half: 98 to 364.
Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in Massachusetts (2024, 2,142 clinicians with data). Median for this group: 222. Middle half: 79 to 552.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 133 in 2020 to 170 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
55 Lake Avenue North
Sicu
Worcester, MA 01655
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
2005
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
38 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 – by Provider, 2024.
Medicare-allowed amount
About $20,342 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 – by Provider and Service, 2024.
Paid by Medicare
About $16,207 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 – by Provider and Service, 2024.
Open Payments general payments, program year 2025
All general payments: $70.40 across 2 records.
By nature of payment
- Food and Beverage: $70.40 across 2 records.
Reporting-company totals
- Boston Scientific Corporation: $54.44 across 1 record.
- Janssen Pharmaceuticals, Inc: $15.96 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
21 years (graduated 2005)
CMS Doctors and Clinicians data list 2005 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
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; Medicare.gov, “Does your provider accept Medicare as full payment?”
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)
Stephen Cahill 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 Stephen Cahill 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 Worcester and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Physician Assistant in Worcester, MA (2024, 226 clinicians with data). Median for this group: 174. Middle half: 98 to 364.
Close to the middle for clinicians listed under Physician Assistant in Massachusetts (2024, 2,142 clinicians with data). Median for this group: 222. Middle half: 79 to 552.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Physician Assistant in Worcester, MA (2024, 226 clinicians with data). Median for this group: $15,866. Middle half: $8,187 to $28,338.
Close to the middle for clinicians listed under Physician Assistant in Massachusetts (2024, 2,142 clinicians with data). Median for this group: $19,073. Middle half: $6,686 to $39,911.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Physician Assistant in Worcester, MA (2024, 226 clinicians with data). Median for this group: $11,961. Middle half: $6,077 to $21,469.
Close to the middle for clinicians listed under Physician Assistant in Massachusetts (2024, 2,142 clinicians with data). Median for this group: $14,188. Middle half: $5,025 to $29,930.
425 active clinicians are listed under Physician Assistant with a practice address in Worcester, MA (4,715 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Worcester
15.8% of these 425 clinicians have the CMS telehealth indicator.
69.4% of these 425 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 28% from 133 in 2020 to 170 in 2024.
- 2020: 133
- 2021: 136
- 2022: 127
- 2023: 134
- 2024: 170
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Medicare-allowed amount
Medicare-allowed amount increased 40% from $14,520 in 2020 to $20,342 in 2024.
- 2020: $14,520
- 2021: $14,418
- 2022: $18,923
- 2023: $17,143
- 2024: $20,342
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Paid by Medicare
Paid by Medicare increased 40% from $11,564 in 2020 to $16,207 in 2024.
- 2020: $11,564
- 2021: $11,568
- 2022: $15,149
- 2023: $13,698
- 2024: $16,207
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2025 only.
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 – December 31, 2025): fewer than 11 records totaling $70.40.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Boston Scientific Corporation |
Food and Beverage
In-kind items and services
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General - Pain Management | General | $54.44 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $15.96 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 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 – by Provider and Service data, 2017–2024; 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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111 | 32 | $404.00 | $89.07 |
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99291
Critical care, first 30-74 minutes
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59 | 36 | $927.00 | $177.20 |
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: 2020-10-30NUCC 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
I20061226000078
MA
5890795868
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
119 Belmont St, Worcester, MA 016052903
Phone: 5083341000
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
Adult-Gerontology Acute Care Nurse Practitioner (Board Certified)
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner
Surgery - Surgical Critical Care
Doctor of Medicine (M.D.), Master of Science
Surgery - Surgical Critical Care
Doctor of Medicine (M.D.)
Nurse Practitioner
Family Nurse Practitioner
Career & Practice History
NPI enumerated December 06, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Physician Assistants in Worcester
- Mia Andresen Roumia, PA-C
- Ryan Mullen, PA
- Jaelah Deangelis, MMS PA-C
- Lindsey Jolley, PA-C
- Elizabeth Schaut, PA-C
- Karla Hanson, PA-C
Mailing Address
Po Box 415348
Boston, MA 022410001
Phone: 8002258885