Dr. Mark Anthony Johnson , MD
Ophthalmology โข Venice, FL
811 Ridgewood Avenue
Venice, FL 34285
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 March 7, 2006; this date does not establish years in practice.
-
Published CMS data list 4,253 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.
-
Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 1,088 service units.
- 92250 โ Photography of the retina: 740 service units.
- 99213 โ Established patient outpatient office visit: 593 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 17 records in the table ยท Guide: How to read Medicare Part B data
-
Published CMS data list 1,778 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
-
Published Part D records, 2024:
- Erythromycin (Erythromycin Base) โ 492 prescription fills, including refills.
- Latanoprost โ 351 prescription fills, including refills.
- Neomycin-Polymyxin-Dexameth (Neomycin/Polymyxin B/Dexametha) โ 166 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 14 records in the table ยท Guide: How to read Medicare Part D prescriber data
-
More Medicare Part B services than 70% of clinicians listed under Ophthalmology in Florida (2024, 1,014 clinicians with data). Median for this group: 2,174. Middle half: 801 to 4,691.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
-
Medicare Part B services went from 6,533 in 2020 to 4,253 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
811 Ridgewood Avenue
Venice, FL 34285
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
1,328 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 $403,326 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 $286,384 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.
30-day fills
3,136 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
$160,767 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 โ by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $17.44 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
NPI first issued
2006
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, 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. Johnson 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. Johnson 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 Venice and Florida
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 70% of clinicians listed under Ophthalmology in Florida (2024, 1,014 clinicians with data). Median for this group: 2,174. Middle half: 801 to 4,691.
Too few clinicians listed under Ophthalmology in Venice have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 65% of clinicians listed under Ophthalmology in Florida (2024, 1,014 clinicians with data). Median for this group: $239,067. Middle half: $86,567 to $537,508.
Too few clinicians listed under Ophthalmology in Venice have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 65% of clinicians listed under Ophthalmology in Florida (2024, 1,014 clinicians with data). Median for this group: $175,260. Middle half: $61,464 to $390,296.
Too few clinicians listed under Ophthalmology in Venice have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Ophthalmology in Florida (2024, 1,099 clinicians with data). Median for this group: 1,203. Middle half: 442 to 2,490.
Too few clinicians listed under Ophthalmology in Venice have Medicare Part D data for 2024 to compare.
Part D drug cost
Close to the middle for clinicians listed under Ophthalmology in Florida (2024, 1,099 clinicians with data). Median for this group: $114,958. Middle half: $23,858 to $310,282.
Too few clinicians listed under Ophthalmology in Venice have Medicare Part D data for 2024 to compare.
12 active clinicians are listed under Ophthalmology with a practice address in Venice, FL (1,582 in Florida).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Venice
0% of these 12 clinicians have the CMS telehealth indicator.
75% of these 12 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 decreased 35% from 6,533 in 2020 to 4,253 in 2024.
- 2020: 6,533
- 2021: 6,732
- 2022: 6,186
- 2023: 5,767
- 2024: 4,253
-
Medicare-allowed amount
Medicare-allowed amount decreased 37% from $638,277 in 2020 to $403,326 in 2024.
- 2020: $638,277
- 2021: $640,758
- 2022: $601,947
- 2023: $560,245
- 2024: $403,326
-
Paid by Medicare
Paid by Medicare decreased 37% from $456,104 in 2020 to $286,384 in 2024.
- 2020: $456,104
- 2021: $467,134
- 2022: $426,116
- 2023: $403,604
- 2024: $286,384
-
Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 1,850 in 2020 and 1,778 in 2024.
- 2020: 1,850
- 2021: 1,905
- 2022: 1,951
- 2023: 1,988
- 2024: 1,778
-
30-day fills
30-day fills stayed about the same: 3,076 in 2020 and 3,136 in 2024.
- 2020: 3,076
- 2021: 3,160
- 2022: 3,097
- 2023: 3,274
- 2024: 3,136
-
Part D drug cost
Part D drug cost stayed about the same: $172,292 in 2020 and $160,767 in 2024.
- 2020: $172,292
- 2021: $174,808
- 2022: $174,037
- 2023: $194,983
- 2024: $160,767
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $43.52 in 2021 to $17.44 in 2025.
- 2021: $43.52
- 2022: $45.27
- 2023: $187.32
- 2024: $252.71
- 2025: $17.44
Sources: CMS Medicare Physician & Other Practitioners (2024), 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 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 $17.44.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Harrow Eye, LLC |
Food and Beverage
In-kind items and services
|
VEVYE | General | $17.44 |
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 2016โ2023 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, 2017โ2024; 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 |
|---|---|---|---|---|
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
1,088 | 1,049 | $206.34 | $129.44 |
|
92250
Photography of the retina
|
740 | 719 | $79.02 | $35.92 |
|
99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
|
593 | 397 | $139.18 | $91.61 |
|
92134
Imaging of retina
|
387 | 378 | $64.67 | $39.77 |
|
92083
Exam of visual field with extended testing
|
305 | 281 | $107.87 | $62.21 |
|
92133
Imaging of optic nerve
|
275 | 263 | $64.53 | $36.00 |
|
92020
Exam of the internal drainage system of eye
|
197 | 195 | $44.71 | $27.12 |
|
99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
119 | 119 | $246.64 | $169.24 |
|
66984
Removal of cataract with insertion of prosthetic lens
|
115 | 66 | $1086.77 | $540.65 |
|
92136
Measurement of corneal curvature and depth of eye
|
115 | 73 | $98.64 | $38.43 |
|
76514
Ultrasound scan of cornea to determine thickness
|
112 | 105 | $18.81 | $10.91 |
|
66821
Removal of recurring cataract in lens capsule using a laser
|
110 | 78 | $597.74 | $307.97 |
|
92285
Photography of content of eyes
|
26 | 25 | $45.55 | $22.41 |
|
67700
Incision and drainage of abscess of eyelid
|
22 | 22 | $538.18 | $276.44 |
|
99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
|
19 | 17 | $105.84 | $56.88 |
|
92082
Exam of visual field with intermediate testing
|
17 | 17 | $82.93 | $46.19 |
|
92014
Established patient complete exam of visual system
|
13 | 13 | $221.32 | $124.59 |
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 |
|---|---|---|---|---|---|
| Erythromycin | Erythromycin Base | 492 | 20,376 | $8,966.52 | 342 |
| Latanoprost | Latanoprost | 351 | 25,659 | $4,637.72 | 109 |
| Neomycin-Polymyxin-Dexameth | Neomycin/Polymyxin B/Dexametha | 166 | 3,779 | $1,640.50 | 132 |
| Timolol Maleate | Timolol Maleate | 130 | 9,109 | $1,477.67 | 50 |
| Ketorolac Tromethamine | Ketorolac Tromethamine | 125 | 3,938 | $2,409.64 | 73 |
| Ofloxacin | Ofloxacin | 105 | 2,024 | $861.12 | 69 |
| Restasis | Cyclosporine | 89 | 5,400 | $102,550.14 | 42 |
| Prednisolone Acetate | Prednisolone Acetate | 88 | 2,430 | $2,461.78 | 50 |
| Brimonidine Tartrate | Brimonidine Tartrate | 81 | 5,118 | $2,403.47 | 28 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 52 | 3,052 | $963.56 | 15 |
| Cyclosporine | Cyclosporine | 40 | 2,625 | $22,454.65 | 14 |
| Metronidazole | Metronidazole | 24 | 1,127 | $1,476.28 | 18 |
| Dorzolamide Hcl | Dorzolamide Hcl | 19 | 1,128 | $406.21 | โ |
| Vyzulta | Latanoprostene Bunod | 16 | 569 | $8,058.08 | โ |
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: 2024-10-04NUCC 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
I20041014000996
FL
6002876117
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.
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Ophthalmology
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at PO BOX 162264, ALTAMONTE SPRINGS, FL 327162264
NPI status registered as active in NPPES database
Registered at 811 RIDGEWOOD AVENUE, VENICE, FL 34285 (Tel: 9414800600)
Registered at 1824 ISLAND WAY, OSPREY, FL 34229 (Tel: 9419189522)
Recorded as MARK JOHNSON, MD
Ophthalmology (license number reported to NPPES: FL ME64457)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Ophthalmology Specialists in Venice
- Dr. Trenity Mckinney, MD
- Dr. P Dee Stephenson, MD, PA
- Dr. Guruswami Giri, MD
- Dr. Steven Kane, MD
- Dr. David Shoemaker, MD
- Dr. Joshua Kim, MD
Mailing Address
Po Box 162264
Altamonte Springs, FL 327162264