Dr. Peter T Zacharia , MD
Ophthalmology • Worcester, MA
33 Lancaster St
Worcester, MA 016092615
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 August 16, 2005; this date does not establish years in practice.
-
Published CMS data list 3,313 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
-
Published Part B service records, 2024:
- 99213 — Established patient outpatient office visit: 1,031 service units.
- 92083 — Exam of visual field with extended testing: 455 service units.
- 92133 — Imaging of optic nerve: 430 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® 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 15 records in the table · Guide: How to read Medicare Part B data
-
Published CMS data list 6,228 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.
-
Published Part D records, 2024:
- Latanoprost — 1,620 prescription fills, including refills.
- Brimonidine Tartrate — 763 prescription fills, including refills.
- Timolol Maleate — 713 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 all 28 records in the table · Guide: How to read Medicare Part D prescriber data
-
More Medicare Part B services than 85% of clinicians listed under Ophthalmology in Worcester, MA (2024, 25 clinicians with data). Median for this group: 2,109. Middle half: 1,103 to 2,727.
More Medicare Part B services than 70% of clinicians listed under Ophthalmology in Massachusetts (2024, 480 clinicians with data). Median for this group: 1,836. Middle half: 621 to 3,502.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
-
Medicare Part B services went from 3,395 in 2020 to 3,313 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
33 Lancaster St
Worcester, MA 016092615
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Worcester, MA. See the list
Source: CMS NPPES NPI Registry, practice location records; 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, CMS release of October 2, 2026
New York Medical College
1988
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
746 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 – by Provider, 2024.
Medicare-allowed amount
About $313,016 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 – by Provider and Service, 2024.
Paid by Medicare
About $216,530 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 – by Provider and Service, 2024.
30-day fills
14,063 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
$608,359 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.
Open Payments general payments, program year 2025
All general payments: $79.40 across 2 records.
By nature of payment
- Food and Beverage: $79.40 across 2 records.
Reporting-company totals
- Glaukos Corporation: $46.18 across 1 record.
- Alcon Vision LLC: $33.22 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
38 years (graduated 1988)
CMS Doctors and Clinicians data list 1988 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, CMS release of October 2, 2026.
NPI first issued
2005
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, CMS release of October 2, 2026; 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, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Zacharia 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. Zacharia 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 85% of clinicians listed under Ophthalmology in Worcester, MA (2024, 25 clinicians with data). Median for this group: 2,109. Middle half: 1,103 to 2,727.
More Medicare Part B services than 70% of clinicians listed under Ophthalmology in Massachusetts (2024, 480 clinicians with data). Median for this group: 1,836. Middle half: 621 to 3,502.
Medicare-allowed amount
A higher Medicare-allowed amount than 70% of clinicians listed under Ophthalmology in Worcester, MA (2024, 25 clinicians with data). Median for this group: $243,284. Middle half: $104,783 to $325,377.
A higher Medicare-allowed amount than 65% of clinicians listed under Ophthalmology in Massachusetts (2024, 480 clinicians with data). Median for this group: $193,068. Middle half: $60,397 to $416,557.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Ophthalmology in Worcester, MA (2024, 25 clinicians with data). Median for this group: $167,160. Middle half: $70,594 to $231,695.
A higher Medicare payment amount than 60% of clinicians listed under Ophthalmology in Massachusetts (2024, 480 clinicians with data). Median for this group: $143,381. Middle half: $41,538 to $304,079.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Ophthalmology in Worcester, MA (2024, 27 clinicians with data). Median for this group: 897. Middle half: 330 to 2,736.
More Part D prescriptions than 95% of clinicians listed under Ophthalmology in Massachusetts (2024, 516 clinicians with data). Median for this group: 777. Middle half: 213 to 2,065.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Ophthalmology in Worcester, MA (2024, 27 clinicians with data). Median for this group: $78,089. Middle half: $30,314 to $260,847.
A higher Part D drug cost than 90% of clinicians listed under Ophthalmology in Massachusetts (2024, 516 clinicians with data). Median for this group: $59,749. Middle half: $7,822 to $215,537.
40 active clinicians are listed under Ophthalmology with a practice address in Worcester, MA (786 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Worcester
2.5% of these 40 clinicians have the CMS telehealth indicator.
67.5% of these 40 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
Medicare Part B services stayed about the same: 3,395 in 2020 and 3,313 in 2024.
- 2020: 3,395
- 2021: 3,847
- 2022: 3,726
- 2023: 3,510
- 2024: 3,313
-
Medicare-allowed amount
Medicare-allowed amount stayed about the same: $329,955 in 2020 and $313,016 in 2024.
- 2020: $329,955
- 2021: $385,436
- 2022: $362,278
- 2023: $338,567
- 2024: $313,016
-
Paid by Medicare
Paid by Medicare stayed about the same: $229,319 in 2020 and $216,530 in 2024.
- 2020: $229,319
- 2021: $272,164
- 2022: $251,628
- 2023: $236,927
- 2024: $216,530
-
Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 6,708 in 2020 and 6,228 in 2024.
- 2020: 6,708
- 2021: 6,885
- 2022: 6,761
- 2023: 6,483
- 2024: 6,228
-
30-day fills
30-day fills stayed about the same: 13,057 in 2020 and 14,063 in 2024.
- 2020: 13,057
- 2021: 13,799
- 2022: 14,186
- 2023: 14,127
- 2024: 14,063
-
Part D drug cost
Part D drug cost decreased 13% from $697,429 in 2020 to $608,359 in 2024.
- 2020: $697,429
- 2021: $678,081
- 2022: $712,146
- 2023: $659,004
- 2024: $608,359
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $196.53 in 2021 to $79.40 in 2025.
- 2021: $196.53
- 2022: $94.63
- 2023: $121.54
- 2024: $301.70
- 2025: $79.40
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 – December 31, 2025): fewer than 11 records totaling $79.40.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Glaukos Corporation |
Food and Beverage
Cash or cash equivalent
|
— | General | $46.18 |
| Alcon Vision LLC |
Food and Beverage
In-kind items and services
|
Rocklatan | General | $33.22 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 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, 2017–2024; 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 |
|---|---|---|---|---|
|
99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
|
1,031 | 518 | $250.44 | $93.44 |
|
92083
Exam of visual field with extended testing
|
455 | 402 | $237.76 | $65.21 |
|
92133
Imaging of optic nerve
|
430 | 387 | $250.00 | $37.74 |
|
92014
Established patient complete exam of visual system
|
414 | 411 | $371.50 | $130.83 |
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
248 | 200 | $358.13 | $130.20 |
|
92250
Photography of the retina
|
219 | 218 | $174.44 | $38.13 |
|
92134
Imaging of retina
|
112 | 101 | $198.96 | $41.62 |
|
92020
Exam of the internal drainage system of eye
|
109 | 105 | $90.87 | $27.61 |
|
92136
Measurement of corneal curvature and depth of eye
|
85 | 71 | $220.00 | $39.98 |
|
99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
68 | 68 | $468.34 | $170.55 |
|
66984
Removal of cataract with insertion of prosthetic lens
|
50 | 45 | $2158.00 | $535.99 |
|
76514
Ultrasound scan of cornea to determine thickness
|
35 | 35 | $110.00 | $10.98 |
|
66821
Removal of recurring cataract in lens capsule using a laser
|
24 | 24 | $950.00 | $345.86 |
|
66991
Extracapsular removal of cataract with insertion of artificial lens and insertion of drainage device in front chamber of eye
|
21 | 19 | $2250.00 | $705.80 |
|
65855
Laser repair to improve eye fluid flow
|
12 | 11 | $974.67 | $250.37 |
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.
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 |
|---|---|---|---|---|---|
| Latanoprost | Latanoprost | 1,620 | 124,422 | $27,070.07 | 541 |
| Brimonidine Tartrate | Brimonidine Tartrate | 763 | 53,431 | $32,265.40 | 245 |
| Timolol Maleate | Timolol Maleate | 713 | 56,021 | $9,069.82 | 237 |
| Dorzolamide Hcl | Dorzolamide Hcl | 624 | 42,321 | $15,076.31 | 181 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 580 | 39,999 | $11,198.26 | 152 |
| Prednisolone Acetate | Prednisolone Acetate | 312 | 11,449 | $15,882.57 | 189 |
| Pilocarpine Hcl | Pilocarpine Hcl | 295 | 22,651 | $21,583.03 | 96 |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 201 | 6,141 | $2,330.61 | 139 |
| Rhopressa | Netarsudil Mesylate | 188 | 11,237 | $123,524.95 | 66 |
| Ofloxacin | Ofloxacin | 155 | 3,042 | $1,621.74 | 130 |
| Brinzolamide | Brinzolamide | 145 | 8,411 | $37,381.98 | 39 |
| Rocklatan | Netarsudil Mesylat/Latanoprost | 122 | 7,423 | $77,607.61 | 45 |
| Simbrinza | Brinzolamide/Brimonidine Tart | 60 | 3,244 | $22,314.93 | 16 |
| Acetazolamide Er | Acetazolamide | 53 | 3,096 | $1,587.88 | 17 |
| Phospholine Iodide | Echothiophate Iodide | 47 | 1,316 | $122,973.90 | — |
| Combigan | Brimonidine Tartrate/Timolol | 44 | 2,680 | $22,074.57 | 11 |
| Brimonidine Tartrate-Timolol | Brimonidine Tartrate/Timolol | 43 | 2,585 | $10,701.40 | 13 |
| Travoprost | Travoprost | 35 | 2,949 | $10,574.59 | 15 |
| Lumigan | Bimatoprost | 34 | 1,556 | $16,525.64 | — |
| Levobunolol Hcl | Levobunolol Hcl | 30 | 2,011 | $1,427.07 | — |
| Betoptic S | Betaxolol Hcl | 26 | 1,462 | $10,884.46 | — |
| Acetazolamide | Acetazolamide | 25 | 1,455 | $1,527.61 | — |
| Tafluprost | Tafluprost/Pf | 25 | 1,530 | $5,417.23 | — |
| Dorzolamide-Timolol | Dorzolamide/Timolol/Pf | 24 | 1,140 | $3,240.63 | — |
| Erythromycin | Erythromycin Base | 23 | 403 | $326.62 | — |
(top 25 shown)
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: 2023-12-01NUCC Taxonomy Code: 207W00000X
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPHTHALMOLOGY
I20050506000351
MA
6204876493
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Secondary Practice Locations
281 Lincoln Street
Worcester, MA 016052138
Phone: 5083346855
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Additional practice office at 281 Lincoln Street, Worcester, MA 016052138
NPI status registered as active in NPPES database
Registered at 33 LANCASTER ST, WORCESTER, MA 016092615 (Tel: 5087918484)
Registered at 33 LANCASTER ST, WORCESTER, MA 016092615 (Tel: 5087918484)
Recorded as PETER ZACHARIA, MD
Ophthalmology (license number reported to NPPES: MA 75948)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Ophthalmology Specialists in Worcester
- Dr. Olga Ceron, MD
- Dr. Joseph Williams, MD
- Dr. Eugenio Candal, MD
- Dr. Jeremy Meltzer, MD
- Dr. Oded Ohana, MD
- Dr. Stuart Weisman, MD
Mailing Address
33 Lancaster St
Worcester, MA 016092615
Phone: 5087918484