Dr. Mark J Stamm , MD
Ophthalmology • Lewes, DE
28185 Celestial Way
Lewes, DE 19958
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 November 30, 2005; this date does not establish years in practice.
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Published CMS data list 795 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.
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Published Part B service records, 2024:
- 92014 — Established patient complete exam of visual system: 141 service units.
- 92250 — Photography of the retina: 112 service units.
- 92081 — Exam of visual field with limited testing: 88 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 12 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 648 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:
- Latanoprost — 208 prescription fills, including refills.
- Timolol Maleate — 58 prescription fills, including refills.
- Prednisolone Acetate — 57 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 18 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 85% of clinicians listed under Ophthalmology in Delaware (2024, 37 clinicians with data). Median for this group: 2,725. Middle half: 1,743 to 5,745.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 2,712 in 2020 to 795 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
28185 Celestial Way
Lewes, DE 19958
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
335 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 $74,159 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 $41,945 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
1,107 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
$106,258 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 2024
All general payments: $76.33 across 3 records.
By nature of payment
- Food and Beverage: $76.33 across 3 records.
Reporting-company totals
- Harrow Eye, LLC: $50.92 across 2 records.
- Tarsus Pharmaceuticals, Inc.: $25.41 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 2024 (published June 30, 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.
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.
Compared with the same specialty in Lewes and Delaware
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 85% of clinicians listed under Ophthalmology in Delaware (2024, 37 clinicians with data). Median for this group: 2,725. Middle half: 1,743 to 5,745.
Too few clinicians listed under Ophthalmology in Lewes have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 85% of clinicians listed under Ophthalmology in Delaware (2024, 37 clinicians with data). Median for this group: $359,208. Middle half: $162,754 to $829,110.
Too few clinicians listed under Ophthalmology in Lewes have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 90% of clinicians listed under Ophthalmology in Delaware (2024, 37 clinicians with data). Median for this group: $270,917. Middle half: $113,718 to $612,165.
Too few clinicians listed under Ophthalmology in Lewes have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Close to the middle for clinicians listed under Ophthalmology in Delaware (2024, 40 clinicians with data). Median for this group: 829. Middle half: 437 to 1,984.
Too few clinicians listed under Ophthalmology in Lewes have Medicare Part D data for 2024 to compare.
Part D drug cost
Close to the middle for clinicians listed under Ophthalmology in Delaware (2024, 40 clinicians with data). Median for this group: $103,694. Middle half: $12,662 to $171,349.
Too few clinicians listed under Ophthalmology in Lewes have Medicare Part D data for 2024 to compare.
2 active clinicians are listed under Ophthalmology with a practice address in Lewes, DE (65 in Delaware).
Addresses are self-reported to NPPES and may be out of date.
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 71% from 2,712 in 2020 to 795 in 2024.
- 2020: 2,712
- 2021: 2,754
- 2022: 2,740
- 2023: 2,718
- 2024: 795
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Medicare-allowed amount
Medicare-allowed amount decreased 75% from $295,709 in 2020 to $74,159 in 2024.
- 2020: $295,709
- 2021: $323,797
- 2022: $275,465
- 2023: $286,788
- 2024: $74,159
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Paid by Medicare
Paid by Medicare decreased 80% from $213,923 in 2020 to $41,945 in 2024.
- 2020: $213,923
- 2021: $241,025
- 2022: $194,918
- 2023: $208,633
- 2024: $41,945
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 46% from 1,192 in 2020 to 648 in 2024.
- 2020: 1,192
- 2021: 1,191
- 2022: 1,306
- 2023: 1,254
- 2024: 648
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30-day fills
30-day fills decreased 42% from 1,913 in 2020 to 1,107 in 2024.
- 2020: 1,913
- 2021: 2,029
- 2022: 2,277
- 2023: 2,026
- 2024: 1,107
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Part D drug cost
Part D drug cost decreased 53% from $227,984 in 2020 to $106,258 in 2024.
- 2020: $227,984
- 2021: $263,835
- 2022: $279,824
- 2023: $215,404
- 2024: $106,258
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $357.23 in 2020 to $76.33 in 2024.
- 2020: $357.23
- 2021: $315.87
- 2022: $466.96
- 2023: $237.75
- 2024: $76.33
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, 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 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $76.33.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Harrow Eye, LLC |
Food and Beverage
In-kind items and services
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VEVYE | General | $28.26 |
| Tarsus Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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XDEMVY | General | $25.41 |
| Harrow Eye, LLC |
Food and Beverage
In-kind items and services
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VEVYE | General | $22.66 |
Source: CMS Open Payments, program year 2024, 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 |
|---|---|---|---|---|
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92014
Established patient complete exam of visual system
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141 | 141 | $145.00 | $126.34 |
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92250
Photography of the retina
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112 | 112 | $86.00 | $35.24 |
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92081
Exam of visual field with limited testing
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88 | 88 | $131.00 | $33.81 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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79 | 74 | $150.00 | $128.73 |
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92012
Established patient problem focused exam of visual system
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67 | 64 | $106.27 | $90.28 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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64 | 55 | $120.00 | $90.03 |
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92134
Imaging of retina
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60 | 57 | $107.82 | $39.13 |
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92133
Imaging of optic nerve
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52 | 51 | $157.50 | $36.59 |
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92136
Measurement of corneal curvature and depth of eye
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39 | 29 | $178.07 | $39.05 |
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92083
Exam of visual field with extended testing
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38 | 38 | $190.00 | $64.57 |
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66984
Removal of cataract with insertion of prosthetic lens
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35 | 26 | $3077.00 | $540.22 |
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92202
Extended exam of the back part of the eye with optic nerve drawing
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20 | 20 | $68.00 | $15.41 |
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 | 208 | 10,474 | $1,813.91 | 66 |
| Timolol Maleate | Timolol Maleate | 58 | 3,943 | $1,564.48 | 27 |
| Prednisolone Acetate | Prednisolone Acetate | 57 | 1,375 | $2,081.03 | 43 |
| Gatifloxacin | Gatifloxacin | 41 | 632 | $1,776.51 | 29 |
| Lumigan | Bimatoprost | 35 | 2,638 | $22,993.78 | 18 |
| Brimonidine Tartrate | Brimonidine Tartrate | 33 | 1,761 | $629.47 | 16 |
| Dorzolamide Hcl | Dorzolamide Hcl | 30 | 1,672 | $716.44 | 12 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 28 | 1,950 | $883.88 | 12 |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 27 | 723 | $1,039.85 | 17 |
| Restasis | Cyclosporine | 19 | 1,650 | $33,144.79 | 11 |
| Bromfenac Sodium | Bromfenac Sodium | 16 | 505 | $2,461.58 | 14 |
| Xiidra | Lifitegrast | 16 | 780 | $17,363.79 | — |
| Rhopressa | Netarsudil Mesylate | 15 | 440 | $5,293.27 | — |
| Rocklatan | Netarsudil Mesylat/Latanoprost | 15 | 485 | $5,774.59 | — |
| Travoprost | Travoprost | 14 | 654 | $1,993.07 | — |
| Moxifloxacin | Moxifloxacin Hcl | 13 | 184 | $384.17 | — |
| Brimonidine Tartrate-Timolol | Brimonidine Tartrate/Timolol | 12 | 593 | $2,307.66 | — |
| Combigan | Brimonidine Tartrate/Timolol | 11 | 645 | $4,036.22 | — |
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: 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
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Optometrist
Doctor of Optometry
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 28185 CELESTIAL WAY, LEWES, DE 19958 (Tel: 9142839027)
Registered at PO BOX 73, NASSAU, DE 19969 (Tel: 9142839027)
Ophthalmology (license number reported to NPPES: DE C1-0027102)
NPI status registered as active in NPPES database
Registered at 1 HATFIELD LN, STE 3 EYE PHYSICIANS OF ORANGE COUNTY PC, GOSHEN, NY 109246752 (Tel: 8452945128)
Registered at 1 HATFIELD LN, STE 3 EYE PHYSICIANS OF ORANGE COUNTY PC, GOSHEN, NY 109246752 (Tel: 8452945128)
Recorded as MARK STAMM, MD
Ophthalmology (license number reported to NPPES: NY 135026)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
Po Box 73
Nassau, DE 19969
Phone: 9142839027