John Joseph Ahern , PA-C
Physician Assistant - Medical • Boston, MA
55 Fruit St, White 1
Boston, MA 021142621
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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John Ahern is listed in NPPES under Physician Assistant - Medical.
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NPI assigned on October 21, 2015; this date does not establish years in practice.
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Published CMS data list 14 Original Medicare Part B services in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Published rows only; this is not a quality measure.
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Published Part B service records, 2022:
- 99217 — Hospital observation care on day of discharge: 14 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2022. Units differ by code; these are not visits or a measure of quality.
CPT® 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 · Guide: How to read Medicare Part B data
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Published CMS data list 13 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Metformin Hcl — 13 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 85% of clinicians listed under Physician Assistant - Medical in Boston, MA (2024, 50 clinicians with data). Median for this group: 143. Middle half: 30 to 436.
Fewer Part D prescriptions than 95% of clinicians listed under Physician Assistant - Medical in Massachusetts (2024, 470 clinicians with data). Median for this group: 323. Middle half: 96 to 1,096.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 22 in 2019 to 14 in 2022.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2019–2022.
Practice Location & Contact Primary Location
55 Fruit St
White 1
Boston, MA 021142621
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Physician Assistant - Medical: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $924 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 – by Provider and Service, 2022.
Paid by Medicare
About $738 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 – by Provider and Service, 2022.
30-day fills
13 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
$151 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 – by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2021–2025.
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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)
John Ahern 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 John Ahern 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 D prescriptions
Fewer Part D prescriptions than 85% of clinicians listed under Physician Assistant - Medical in Boston, MA (2024, 50 clinicians with data). Median for this group: 143. Middle half: 30 to 436.
Fewer Part D prescriptions than 95% of clinicians listed under Physician Assistant - Medical in Massachusetts (2024, 470 clinicians with data). Median for this group: 323. Middle half: 96 to 1,096.
Part D drug cost
A lower Part D drug cost than 85% of clinicians listed under Physician Assistant - Medical in Boston, MA (2024, 50 clinicians with data). Median for this group: $9,988. Middle half: $406 to $123,910.
A lower Part D drug cost than 90% of clinicians listed under Physician Assistant - Medical in Massachusetts (2024, 470 clinicians with data). Median for this group: $10,266. Middle half: $1,003 to $113,554.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for John Ahern are from 2022.
156 active clinicians are listed under Physician Assistant - Medical with a practice address in Boston, MA (886 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Boston
10.3% of these 156 clinicians have the CMS telehealth indicator.
50.6% of these 156 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 36% from 22 in 2019 to 14 in 2022.
- 2019: 22
- 2021: 27
- 2022: 14
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Medicare-allowed amount
Medicare-allowed amount went from $418 in 2019 to $924 in 2022.
- 2019: $418
- 2021: $933
- 2022: $924
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Paid by Medicare
Paid by Medicare went from $333 in 2019 to $738 in 2022.
- 2019: $333
- 2021: $747
- 2022: $738
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Medicare Part D prescriptions
Medicare Part D prescriptions went from 11 in 2019 to 13 in 2024.
- 2019: 11
- 2024: 13
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30-day fills
30-day fills went from 11 in 2019 to 13 in 2024.
- 2019: 11
- 2024: 13
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Part D drug cost
Part D drug cost went from $108 in 2019 to $151 in 2024.
- 2019: $108
- 2024: $151
Sources: CMS Medicare Physician & Other Practitioners (2022), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2018–2021 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 – by Provider and Service data, 2019–2022; 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 |
|---|---|---|---|---|
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99217
Hospital observation care on day of discharge
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14 | 14 | $288.00 | $66.01 |
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 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Metformin Hcl | Metformin Hcl | 13 | 364 | $150.77 | — |
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
NUCC Taxonomy Code: 363AM0700X
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20160316000587
MA
4789980855
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physician Assistant
Physician Assistant (Certified)
Emergency Medicine
Doctor of Medicine (M.D.)
Psychiatry & Neurology - Psychiatry
Doctor of Medicine (M.D.)
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Internal Medicine
MDPHD
Physician Assistant - Medical
Physician Assistant (Certified)
Career & Practice History
NPI enumerated October 21, 2015.
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 Assistant - Medicals in Boston
- Erin Bertagnolli, PA-C
- Meghan Seaward, PA-C
- Iman Rashed
- Erin Kelly-Makol, PA-C
- Nicole Lewis, MSPAS- PA-C
- Joseph Cullivan, PA-C
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Mailing Address
32 Linden St, Apt 8
Brookline, MA 024457302
Phone: 2036064034