Dr. Jonathan Mazer , MD
Anesthesiology โข Boston, MA
75 Francis St
Boston, MA 021156110
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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NPI assigned on June 24, 2015; this date does not establish years in practice.
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Published CMS data list 136 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:
- 00731 โ Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope: 41 service units.
- 00142 โ Anesthesia for lens surgery: 34 service units.
- 00812 โ Anesthesia for exam of colon using an endoscope: 30 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 all 5 records in the table ยท 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 Anesthesiology in Boston, MA (2024, 528 clinicians with data). Median for this group: 118. Middle half: 53 to 224.
Close to the middle for Medicare Part B services among clinicians listed under Anesthesiology in Massachusetts (2024, 1,137 clinicians with data). Median for this group: 136. Middle half: 66 to 248.
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 85 in 2020 to 136 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
75 Francis St
Boston, MA 021156110
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 4 distinct group names: Bay Anesthesia; Bergen Anesthesia Group, P.C.; Centurion Anesthesia Surgical Centers Llc and 1 more. 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
Anesthesiology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
243 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 $17,704 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 $14,595 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.
Open Payments general payments, program year 2025
All general payments: $36.15 across 2 records.
By nature of payment
- Food and Beverage: $36.15 across 2 records.
Reporting-company totals
- Janssen Pharmaceuticals, Inc: $21.87 across 1 record.
- VERTEX PHARMACEUTICALS INCORPORATED: $14.28 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
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)
Dr. Mazer 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 Dr. Mazer 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 services
Close to the middle for clinicians listed under Anesthesiology in Boston, MA (2024, 528 clinicians with data). Median for this group: 118. Middle half: 53 to 224.
Close to the middle for clinicians listed under Anesthesiology in Massachusetts (2024, 1,137 clinicians with data). Median for this group: 136. Middle half: 66 to 248.
Medicare-allowed amount
Close to the middle for clinicians listed under Anesthesiology in Boston, MA (2024, 528 clinicians with data). Median for this group: $15,862. Middle half: $7,477 to $33,650.
Close to the middle for clinicians listed under Anesthesiology in Massachusetts (2024, 1,137 clinicians with data). Median for this group: $16,429. Middle half: $8,286 to $31,402.
Paid by Medicare
Close to the middle for clinicians listed under Anesthesiology in Boston, MA (2024, 528 clinicians with data). Median for this group: $12,488. Middle half: $5,940 to $26,601.
Close to the middle for clinicians listed under Anesthesiology in Massachusetts (2024, 1,137 clinicians with data). Median for this group: $13,131. Middle half: $6,643 to $24,992.
1,083 active clinicians are listed under Anesthesiology with a practice address in Boston, MA (2,090 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Boston
1.8% of these 1,083 clinicians have the CMS telehealth indicator.
69.2% of these 1,083 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 60% from 85 in 2020 to 136 in 2024.
- 2020: 85
- 2021: 121
- 2022: 115
- 2023: 169
- 2024: 136
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Medicare-allowed amount
Medicare-allowed amount increased 50% from $11,780 in 2020 to $17,704 in 2024.
- 2020: $11,780
- 2021: $17,710
- 2022: $19,368
- 2023: $28,721
- 2024: $17,704
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Paid by Medicare
Paid by Medicare increased 55% from $9,415 in 2020 to $14,595 in 2024.
- 2020: $9,415
- 2021: $14,488
- 2022: $15,740
- 2023: $23,479
- 2024: $14,595
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $13.80 in 2020 to $36.15 in 2025.
- 2020: $13.80
- 2021: $14.02
- 2022: $12.09
- 2024: $3,252.00
- 2025: $36.15
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 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): fewer than 11 records totaling $36.15.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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TREMFYA | General | $21.87 |
| VERTEX PHARMACEUTICALS INCORPORATED |
Food and Beverage
In-kind items and services
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JOURNAVX | General | $14.28 |
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 2018โ2023 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, 2019โ2024; 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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00731
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope
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41 | 40 | $196.37 | $140.53 |
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00142
Anesthesia for lens surgery
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34 | 34 | $141.02 | $137.82 |
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00812
Anesthesia for exam of colon using an endoscope
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30 | 30 | $102.29 | $99.39 |
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00813
Anesthesia for procedure on small and large bowel using an endoscope
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16 | 16 | $160.43 | $156.96 |
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00811
Anesthesia for other procedure on large bowel using an endoscope
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15 | 15 | $120.25 | $117.53 |
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
NUCC Taxonomy Code: 207L00000X
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
NUCC Taxonomy Code: 390200000X
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ANESTHESIOLOGY
I20190612000286
NJ
6709192669
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
Bergen Anesthesia Group, P.c.
223 N Van Dien Ave, Ridgewood, NJ 074502726
Phone: 2018479403
Centurion Anesthesia Surgical Centers Llc
190 Midland Ave, Saddle Brook, NJ 076636408
Phone: 7185408600
Rwjbh Observation Associates Llc
1 Clara Maass Dr, Belleville, NJ 071093550
Phone: 9734502000
Bay Anesthesia
561 Cranbury Rd, East Brunswick, NJ 088165400
Phone: 2016203010
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Emergency Medicine
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Medicine (M.D.)
Neurological Surgery
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Student in an Organized Health Care Education/Training Program
Internal Medicine
Doctor of Medicine (M.D.)
Student in an Organized Health Care Education/Training Program
Career & Practice History
NPI enumerated June 24, 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 Anesthesiology Specialists in Boston
- Dr. Matthew Grunert, MD
- Benjamin Cowan
- Dr. Gregory Crosby, MD
- Dr. Erin Haggerty, MD
- Dr. Daniel Fischer, MD
- Dr. Tara Carey, MD
Mailing Address
Bwh, 75 Francis Street
Boston, MA 02115
Phone: 6177325500