Dr. Guy Philip Guenthner , MD
Orthopaedic Surgery β’ Boston, MA
800 Washington Street, Tufts Mc Box #306
Boston, MA 02111
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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Dr. Guy Guenthner is listed in NPPES under Orthopaedic Surgery.
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NPI assigned on April 15, 2022; this date does not establish years in practice.
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Published CMS data list 30 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Oxycodone Hcl β 30 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β 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 Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 60% of clinicians listed under Orthopaedic Surgery in Boston, MA (2024, 95 clinicians with data). Median for this group: 50. Middle half: 19 to 117.
Fewer Part D prescriptions than 75% of clinicians listed under Orthopaedic Surgery in Massachusetts (2024, 319 clinicians with data). Median for this group: 81. Middle half: 36 to 226.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 11 in 2023 to 30 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2023β2024.
Practice Location & Contact Primary Location
800 Washington Street
Tufts Mc Box #306
Boston, MA 02111
What Public CMS Data Show
Orthopaedic Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
30 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
$88 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 β by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $188.63 across 6 records.
By nature of payment
- Food and Beverage: $188.63 across 6 records.
Reporting-company totals
- Stryker Corporation: $124.32 across 3 records.
- Acera Surgical, Inc.: $41.66 across 2 records.
- PolyNovo North America LLC: $22.65 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).
NPI first issued
2022
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, βDoes your provider accept Medicare as full payment?β
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. Guenthner 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. Guenthner 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 60% of clinicians listed under Orthopaedic Surgery in Boston, MA (2024, 95 clinicians with data). Median for this group: 50. Middle half: 19 to 117.
Fewer Part D prescriptions than 75% of clinicians listed under Orthopaedic Surgery in Massachusetts (2024, 319 clinicians with data). Median for this group: 81. Middle half: 36 to 226.
Part D drug cost
A lower Part D drug cost than 70% of clinicians listed under Orthopaedic Surgery in Boston, MA (2024, 95 clinicians with data). Median for this group: $221. Middle half: $76 to $934.
A lower Part D drug cost than 80% of clinicians listed under Orthopaedic Surgery in Massachusetts (2024, 319 clinicians with data). Median for this group: $460. Middle half: $145 to $1,460.
265 active clinicians are listed under Orthopaedic Surgery with a practice address in Boston, MA (692 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Boston
20.8% of these 265 clinicians have the CMS telehealth indicator.
54.3% of these 265 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 D prescriptions
Medicare Part D prescriptions went from 11 in 2023 to 30 in 2024.
- 2023: 11
- 2024: 30
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30-day fills
30-day fills went from 11 in 2023 to 30 in 2024.
- 2023: 11
- 2024: 30
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Part D drug cost
Part D drug cost went from $52 in 2023 to $88 in 2024.
- 2023: $52
- 2024: $88
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $50.04 in 2022 to $188.63 in 2025.
- 2022: $50.04
- 2023: $453.16
- 2024: $98.14
- 2025: $188.63
Sources: CMS Medicare Part D Prescribers (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 Β· 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 β December 31, 2025): fewer than 11 records totaling $188.63.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Stryker Corporation |
Food and Beverage
In-kind items and services
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HOFFMANN | General | $58.83 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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MAKO | General | $35.41 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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PANGEA | General | $30.08 |
| Acera Surgical, Inc. |
Food and Beverage
In-kind items and services
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Restrata Wound Matrix | General | $24.35 |
| PolyNovo North America LLC |
Food and Beverage
In-kind items and services
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NOVOSORB BTM | General | $22.65 |
| Acera Surgical, Inc. |
Food and Beverage
In-kind items and services
|
Restrata Wound Matrix | General | $17.31 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
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 |
|---|---|---|---|---|---|
| Oxycodone Hcl | Oxycodone Hcl | 30 | 97 | $88.21 | 30 |
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
Self-certified to NPPES: 2022-06-21NUCC Taxonomy Code: 207X00000X
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSORDER AND REFERRING ONLY - ORTHOPEDIC SURGERY
I20220826001708
MA
8921482878
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.
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Physical Medicine & Rehabilitation
Doctor of Medicine (M.D.)
Physician Assistant - Medical
Orthopaedic Surgery
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Orthopaedic Surgery (license number reported to NPPES: MA 293179)
NPI status registered as active in NPPES database
Registered at 800 WASHINGTON STREET, TUFTS MC BOX #306, BOSTON, MA 02111 (Tel: 6176365172)
Registered at 800 WASHINGTON STREET, TUFTS MC BOX #306, BOSTON, MA 02111 (Tel: 6176365172)
Recorded as GUY GUENTHNER, MD
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Orthopaedic Surgery Specialists in Boston
- Dr. Andrew Simpson, MD
- Dr. Jonathan Sunkin, MD
- Christopher Lai
- Dr. Vito Pugliano, MD
- Dr. Nishant Suneja, MD
- Dr. Brett Hayden, MD
Mailing Address
800 Washington Street, Tufts Mc Box #306
Boston, MA 02111
Phone: 6176365172