Dr. Peter Mark Grzesik , DO
Anesthesiology 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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NPI assigned on May 15, 2014; this date does not establish years in practice.
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Published CMS data list 325 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:
- 01996 โ Daily hospital management of continuous spinal drug administration: 48 service units.
- 76937 โ Ultrasonic guidance for blood vessel access: 46 service units.
- 64999 โ Other procedure on nervous system: 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 all 11 records in the table ยท Guide: How to read Medicare Part B data
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More Medicare Part B services than 80% of clinicians listed under Anesthesiology in Worcester, MA (2024, 99 clinicians with data). Median for this group: 135. Middle half: 66 to 248.
More Medicare Part B services than 80% of 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 66 in 2021 to 325 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2021โ2024.
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.
NPPES lists 2 distinct additional practice-address records in Danbury, CT; New Haven, CT. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
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
New York College Of Osteo Medicine Of New York Institute Of Technology
2014
What Public CMS Data Show
Anesthesiology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
247 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 $44,052 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 $35,037 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 2019โ2025.
Years since graduation
12 years (graduated 2014)
CMS Doctors and Clinicians data list 2014 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
2014
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. Grzesik 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. Grzesik 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
More Medicare Part B services than 80% of clinicians listed under Anesthesiology in Worcester, MA (2024, 99 clinicians with data). Median for this group: 135. Middle half: 66 to 248.
More Medicare Part B services than 80% of 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
A higher Medicare-allowed amount than 85% of clinicians listed under Anesthesiology in Worcester, MA (2024, 99 clinicians with data). Median for this group: $15,201. Middle half: $7,189 to $31,542.
A higher Medicare-allowed amount than 85% of 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
A higher Medicare payment amount than 85% of clinicians listed under Anesthesiology in Worcester, MA (2024, 99 clinicians with data). Median for this group: $12,147. Middle half: $5,891 to $24,554.
A higher Medicare payment amount than 85% of 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.
146 active clinicians are listed under Anesthesiology with a practice address in Worcester, MA (2,090 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Worcester
2.1% of these 146 clinicians have the CMS telehealth indicator.
77.4% of these 146 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 392% from 66 in 2021 to 325 in 2024.
- 2021: 66
- 2022: 226
- 2023: 274
- 2024: 325
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Medicare-allowed amount
Medicare-allowed amount increased 235% from $13,136 in 2021 to $44,052 in 2024.
- 2021: $13,136
- 2022: $32,444
- 2023: $29,956
- 2024: $44,052
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Paid by Medicare
Paid by Medicare increased 233% from $10,509 in 2021 to $35,037 in 2024.
- 2021: $10,509
- 2022: $25,887
- 2023: $23,700
- 2024: $35,037
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 2020โ2023 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, 2021โ2024; 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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01996
Daily hospital management of continuous spinal drug administration
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48 | 25 | $372.00 | $61.56 |
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76937
Ultrasonic guidance for blood vessel access
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46 | 34 | $75.00 | $13.48 |
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64999
Other procedure on nervous system
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38 | 22 | $1370.00 | $57.58 |
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36556
Insertion of non-tunneled central venous tube for infusion (5 years or older)
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33 | 30 | $1263.00 | $81.65 |
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36620
Insertion of artery tube for blood sampling or infusion through skin
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33 | 29 | $283.00 | $42.74 |
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99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
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29 | 21 | $342.00 | $116.58 |
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93312
Ultrasound of heart with probe in esophagus, with report
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24 | 24 | $451.00 | $103.79 |
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00560
Anesthesia for procedure on heart and large blood vessels
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23 | 23 | $3342.39 | $479.77 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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21 | 21 | $667.00 | $170.12 |
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00142
Anesthesia for lens surgery
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15 | 15 | $983.33 | $79.50 |
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00567
Anesthesia for heart artery bypass grafting on heart-lung machine
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15 | 15 | $5533.33 | $834.15 |
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: 2021-07-29NUCC 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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - ANESTHESIOLOGY
I20210809002121
MA
4082912928
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
Secondary Practice Locations
20 York St
New Haven, CT 065103220
Phone: 2036884242
24 Hospital Ave
Danbury, CT 068106099
Phone: 2037397000
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 Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Anesthesiology
Doctor of Medicine (M.D.)
Nurse Practitioner
Certified Nurse Practitioner
Anesthesiology
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Medicine (M.D.)
Anesthesiology
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 55 LAKE AVE N, WORCESTER, MA 016550002 (Tel: 5083343271)
Registered at PO BOX 415348, BOSTON, MA 022415348
Recorded as PETER GRZESIK, DO
Anesthesiology (license number reported to NPPES: MA 287786)
Registered at 20 YORK ST, NEW HAVEN, CT 065103220 (Tel: 2036884242)
Registered at 20 YORK ST, NEW HAVEN, CT 065103220 (Tel: 2036884242)
NPI status registered as active in NPPES database
Registered at 55 LAKE AVE N, WORCESTER, MA 016550002 (Tel: 5083341000)
Registered at 55 LAKE AVE N, WORCESTER, MA 016550002
Recorded as PETER GRZESIK, D.O.
Student in an Organized Health Care Education/Training Program
NPI status registered as active in NPPES database
Registered at 24 HOSPITAL AVE, DANBURY, CT 068106099 (Tel: 2037397000)
Registered at 2812 214TH ST, BAYSIDE, NY 113602643
Recorded as PETER GRZESIK
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Anesthesiology Specialists in Worcester
- Dr. Michael Schoor, MD
- Dr. Jason Vandoros, MD
- Dr. Philip Krapchev, MD
- Dr. Thomas Levreault, MD
- Dr. Guido Musch, MD
- Dr. Laura Cohen, DO
Mailing Address
Po Box 415348
Boston, MA 022415348