Cassy Jean Williams , APRN
Nurse Practitioner โข Boston, MA
68 Harrison Ave Ste 600
Boston, MA 021111995
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
-
NPI assigned on March 29, 2012; this date does not establish years in practice.
-
Published CMS data list 108 Original Medicare Part B services in 2022.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2022. Published rows only; this is not a quality measure.
-
Published Part B service records, 2022:
- 99214 โ Established patient outpatient office visit: 73 service units.
- 82075 โ Measurement of alcohol level in breath specimen: 35 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2022. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2021 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2022). CPT notice
See the full table ยท Guide: How to read Medicare Part B data
-
Published CMS data list 58 Medicare Part D prescriptions, including refills, in 2023.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2023. Published rows only; this is not a quality measure.
-
Published Part D records, 2023:
- Buprenorphine-Naloxone (Buprenorphine Hcl/Naloxone Hcl) โ 58 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2023. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table ยท Guide: How to read Medicare Part D prescriber data
-
Medicare Part D prescriptions went from 373 in 2022 to 58 in 2023.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2022โ2023.
Practice Location & Contact Primary Location
68 Harrison Ave Ste 600
Boston, MA 021111995
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 6 distinct additional practice-address records in Austin, TX; Beaverton, OR; Denver, CO and 3 more. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Stepworks Recovery Centers Llc. 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
2016
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
31 people with Original Medicare in 2022
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2022.
Medicare-allowed amount
About $8,370 in 2022
The total amount Medicare approved for these services in 2022. 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, 2022.
Paid by Medicare
About $6,198 in 2022
The part of the Medicare-allowed amount that Medicare itself paid in 2022, 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, 2022.
30-day fills
58 standardized 30-day fills in 2023
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
$3,489 in 2023
The total cost of these prescriptions in 2023, 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, 2023.
Open Payments general payments, program year 2025
All general payments: $1,022.02 across 57 records.
By nature of payment
- Food and Beverage: $1,022.02 across 57 records.
Reporting-company totals (3 largest of 9)
- Gilead Sciences, Inc.: $213.68 across 10 records.
- ABBVIE INC.: $193.72 across 16 records.
- ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.): $150.75 across 9 records.
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
10 years (graduated 2016)
CMS Doctors and Clinicians data list 2016 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)
Cassy Williams 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 Cassy Williams 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 Boston and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Cassy Williams are from 2022.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Cassy Williams are from 2023.
978 active clinicians are listed under Nurse Practitioner with a practice address in Boston, MA (3,509 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Boston
24.7% of these 978 clinicians have the CMS telehealth indicator.
47.1% of these 978 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.
-
Medicare Part B services
CMS data for Medicare Part B services are available for 2022 only.
-
Medicare-allowed amount
CMS data for Medicare-allowed amount are available for 2022 only.
-
Paid by Medicare
CMS data for Medicare payment amount are available for 2022 only.
-
Medicare Part D prescriptions
Medicare Part D prescriptions decreased 84% from 373 in 2022 to 58 in 2023.
- 2022: 373
- 2023: 58
-
30-day fills
30-day fills decreased 85% from 377 in 2022 to 58 in 2023.
- 2022: 377
- 2023: 58
-
Part D drug cost
Part D drug cost decreased 86% from $25,544 in 2022 to $3,489 in 2023.
- 2022: $25,544
- 2023: $3,489
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $16.97 in 2023 to $1,022.02 in 2025.
- 2023: $16.97
- 2024: $432.13
- 2025: $1,022.02
Sources: CMS Medicare Physician & Other Practitioners (2022), CMS Medicare Part D Prescribers (2023), 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): 57 records totaling $1,022.02.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
|
REXULTI | General | $34.03 |
| Alkermes, Inc. |
Food and Beverage
In-kind items and services
|
VIVITROL | General | $33.15 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $29.38 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
|
REXULTI | General | $28.95 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $28.18 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $24.82 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
|
REXULTI | General | $24.81 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $24.43 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $23.79 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $23.48 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $23.46 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $23.34 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $21.95 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $20.83 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $20.40 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $20.06 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
MAVYRET | General | $19.85 |
| Axsome Therapeutics, Inc. |
Food and Beverage
In-kind items and services
|
Auvelity | General | $19.84 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $19.77 |
| Exact Sciences Corporation |
Food and Beverage
In-kind items and services
|
Cologuard Collection Kit | General | $19.56 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
MAVYRET | General | $19.48 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $19.47 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $19.45 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $19.38 |
| Gilead Sciences, Inc. |
Food and Beverage
In-kind items and services
|
โ | General | $19.34 |
(top 25 shown)
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 2021 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, 2022; 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 |
|---|---|---|---|---|
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
73 | 29 | $162.74 | $100.56 |
|
82075
Measurement of alcohol level in breath specimen
|
35 | 11 | $30.90 | $29.41 |
Source: CMS Part B by Provider and Service, 2022; 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 2023.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Buprenorphine-Naloxone | Buprenorphine Hcl/Naloxone Hcl | 58 | 692 | $3,488.89 | 26 |
Source: CMS Part D by Provider and Drug, 2023; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-08-12NUCC 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
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20190520002941
KY
4284977935
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
Stepworks Recovery Centers Llc
201 Peterson Dr, Elizabethtown, KY 427019370
Phone: 80054590314100
Stepworks Recovery Centers Llc
1207 Woodland Dr, Elizabethtown, KY 427012709
Phone: 8005459031
Stepworks Recovery Centers Llc
2901 Ring Rd, Elizabethtown, KY 427019119
Phone: 8005459031
Stepworks Recovery Centers Llc
1111 Crown Pointe Dr, Elizabethtown, KY 427017101
Phone: 8005459031
Stepworks Recovery Centers Llc
312 Chestnut St, Elizabethtown, KY 427019431
Secondary Practice Locations
2415 E Camelback Rd Ste 700
Phoenix, AZ 850164245
Phone: 4806909522
506 2nd Ave Ste 1400
Seattle, WA 981042329
Phone: 8572899374
1580 N Logan St Fl 6
Denver, CO 802031939
Phone: 7208070053
2021 Guadalupe St Ste 260
Austin, TX 787055654
Phone: 3462141790
2033 Gateway Pl Fl 5
San Jose, CA 951103709
Phone: 8572899374
4145 Sw Watson Ave Ste 350
Beaverton, OR 970052191
Phone: 8572899374
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
Advanced Practice Registered Nurse
Nurse Practitioner - Family
Family Nurse Practitioner
Physician Assistant
Physician Assistant
Nurse Practitioner - Family
Family Nurse Practitioner
Physician Assistant
Physician Assistant (Certified)
Nurse Practitioner
Nurse Practitioner
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 68 HARRISON AVE STE 600, BOSTON, MA 021111995 (Tel: 6575000634)
Registered at 13885 SAINT JOHN RD, RINEYVILLE, KY 401629719 (Tel: 2703128189)
Additional practice office at 1580 N Logan St Fl 6, Denver, CO 802031939
Additional practice office at 2415 E Camelback Rd Ste 700, Phoenix, AZ 850164245
Additional practice office at 2033 Gateway Pl Fl 5, San Jose, CA 951103709
Additional practice office at 506 2nd Ave Ste 1400, Seattle, WA 981042329
Additional practice office at 2021 Guadalupe St Ste 260, Austin, TX 787055654
Additional practice office at 4145 SW Watson Ave Ste 350, Beaverton, OR 970052191
Registered at 201 PETERSON DR, ELIZABETHTOWN, KY 427019370 (Tel: 2707655900)
Registered at 201 PETERSON DR, ELIZABETHTOWN, KY 427019370 (Tel: 7076559002)
Registered at 609 W MAIN ST, CLARKSON, KY 427267044 (Tel: 5138347063)
Registered at 615 ELSINORE PL STE 200, CINCINNATI, OH 452021457 (Tel: 5138347063)
Registered at 501 BAXTER AVE STE 125, LOUISVILLE, KY 402041103 (Tel: 5022333290)
Registered at 501 BAXTER AVE STE 125, LOUISVILLE, KY 402041103 (Tel: 5022333290)
Nurse Practitioner (license number reported to NPPES: KY 3013217)
Registered at 1122 NORTHEAST 13TH ST., OKLAHOMA CITY, OK 731049435 (Tel: 4052714351)
Registered at PO BOX 26901, OKLAHOMA CITY, OK 73126 (Tel: 4052714351)
Registered at 950 MAIN ST, MUNFORDVILLE, KY 427659435 (Tel: 2705241201)
Registered at 201 PARK ST, BOWLING GREEN, KY 421011708 (Tel: 2705241201)
Recorded as CASSY WILLIAMS, APRN
NPI status registered as active in NPPES database
Registered at 433 POPLAR TRCE, ELIZABETHTOWN, KY 427018089 (Tel: 2703128189)
Registered at 433 POPLAR TRCE, ELIZABETHTOWN, KY 427018089 (Tel: 2703128189)
Recorded as CASSY WILLIAMS, RN
Registered Nurse (license number reported to NPPES: KY 1127777)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Boston
- Elizabeth Clancy
- Amanda Woodruff, NP, FNP
- Shirley Marshall, NP
- Tracey Lafferty, NP
- Jennifer Cheng, NP
- Laura Leclair, RN
Mailing Address
13885 Saint John Rd
Rineyville, KY 401629719
Phone: 2703128189