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Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
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ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. Joel Corwin
๐Ÿ‘๏ธ
MDIndividual

Joel Corwin, M.D.

NPI: 1518901651
Ventura, CA
10 years of data
Ophthalmology
$12.1M
Total Payments
47.2K
Beneficiaries
121.4K
Services
2.94x
Markup Ratio

Peer Comparison

98th
percentile in specialty
This provider$12.1M
Specialty median$383.7K

๐Ÿ“‹ Key Findings

1Billed $12.1M over 10 years
22.94x markup ratio (above median)
398th percentile in Ophthalmology by payments
45 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $12.1M in total Medicare payments ranks in the 98th percentile of Ophthalmology providers nationally.

This provider's billing patterns fall within normal ranges for their specialty.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$854.03$356.882.39x$497.15$1.4M12.8K5.1K
2015$753.04$268.762.80x$484.28$1.3M12.4K4.8K
2016$640.62$209.253.06x$431.37$1.2M12.3K4.5K
2017$685.02$208.893.28x$476.13$1.3M12.9K5.1K
2018$535.33$201.632.66x$333.70$1.3M12.6K4.8K
2019$516.13$192.722.68x$323.41$1.2M12.5K4.7K
2020$296.16$118.022.51x$178.14$1.1M11.7K4.6K
2021$484.95$186.172.60x$298.78$1.2M11.8K4.6K
2022$291.70$119.742.44x$171.96$1.1M11.6K4.8K
2023$307.44$125.052.46x$182.39$983.4K10.7K4.2K

Top Procedures (20)

J0178Injection, aflibercept, 1 mg
$3.9M
5.2K services$745.79/svc1.86x markup
67028Injection of drug into eyeโš  6.0x markup
$1.8M
19.5K services$90.62/svc5.98x markup
99213Established patient office or other outpatient visit, typically 15 minutes
$1.2M
18.7K services$62.94/svc2.49x markup
92012Eye and medical examination for diagnosis and treatment, established patient
$877.0K
12.6K services$69.49/svc2.69x markup
92250Photography of the retinaโš  4.6x markup
$787.3K
19.1K services$41.26/svc4.64x markup
J7999Compounded drug, not otherwise classified
$705.6K
10.4K services$67.67/svc1.63x markup
92134Diagnostic imaging of retina
$690.8K
19.2K services$35.92/svc2.67x markup
92014Eye and medical examination for diagnosis and treatment, established patient, 1 or more visits
$690.7K
6.8K services$101.82/svc2.70x markup
J2778Injection, ranibizumab, 0.1 mg
$657.1K
2.2K services$303.22/svc2.01x markup
92235Examination of retinal blood vessels by ophthalmoscopeโš  3.5x markup
$349.2K
4.0K services$87.83/svc3.54x markup
67041Removal of membrane from the retina
$196.3K
191 services$1.0K/svc2.52x markup
92004Eye and medical examination for diagnosis and treatment, new patient, 1 or more visits
$80.5K
698 services$115.33/svc2.91x markup
J3590Unclassified biologics
$68.6K
1.3K services$51.76/svc2.13x markup
67228Laser destruction of leaking retinal blood vessels, 1 or more sessionsโš  3.9x markup
$45.7K
73 services$626.55/svc3.87x markup
67210Laser destruction of retinal growth, 1 or more sessionsโš  3.0x markup
$41.8K
94 services$444.38/svc3.02x markup
67042Removal of membrane from the retina, pars plana approach
$29.8K
26 services$1.1K/svc2.47x markup
67108Repair of detached retina and drainage of eye fluid between lens and retina
$23.3K
17 services$1.4K/svc2.32x markup
67040Laser destruction of eye fluid (vitreous) between the lens and retina
$19.0K
16 services$1.2K/svc2.59x markup
92133Diagnostic imaging of optic nerve of eye
$13.6K
429 services$31.63/svc3.00x markup
92083Measurement of field of vision during daylight conditions
$13.1K
242 services$54.22/svc2.85x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
J0178Injection, aflibercept, 1 mg5.2K$3.9M$745.791.86x
67028Injection of drug into eye19.5K$1.8M$90.625.98x
99213Established patient office or other outpatient visit, typically 15 minutes18.7K$1.2M$62.942.49x
92012Eye and medical examination for diagnosis and treatment, established patient12.6K$877.0K$69.492.69x
92250Photography of the retina19.1K$787.3K$41.264.64x
J7999Compounded drug, not otherwise classified10.4K$705.6K$67.671.63x
92134Diagnostic imaging of retina19.2K$690.8K$35.922.67x
92014Eye and medical examination for diagnosis and treatment, established patient, 1 or more visits6.8K$690.7K$101.822.70x
J2778Injection, ranibizumab, 0.1 mg2.2K$657.1K$303.222.01x
92235Examination of retinal blood vessels by ophthalmoscope4.0K$349.2K$87.833.54x
67041Removal of membrane from the retina191$196.3K$1.0K2.52x
92004Eye and medical examination for diagnosis and treatment, new patient, 1 or more visits698$80.5K$115.332.91x
J3590Unclassified biologics1.3K$68.6K$51.762.13x
67228Laser destruction of leaking retinal blood vessels, 1 or more sessions73$45.7K$626.553.87x
67210Laser destruction of retinal growth, 1 or more sessions94$41.8K$444.383.02x
67042Removal of membrane from the retina, pars plana approach26$29.8K$1.1K2.47x
67108Repair of detached retina and drainage of eye fluid between lens and retina17$23.3K$1.4K2.32x
67040Laser destruction of eye fluid (vitreous) between the lens and retina16$19.0K$1.2K2.59x
92133Diagnostic imaging of optic nerve of eye429$13.6K$31.633.00x
92083Measurement of field of vision during daylight conditions242$13.1K$54.222.85x

Markup Analysis

Charge-to-Payment Ratio

2.94x

This provider submits charges 2.94 times higher than what Medicare actually pays.

What This Means

A markup ratio of 2.94x means for every $100 Medicare pays, this provider initially charges $294. This is higher than the national average.

Location

Ventura, CA

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

Similar Providers

Other Ophthalmology providers in CA for peer comparison.

Joel Corwin (you)
$12.1M
Nathan Steinle, M.D.
$63.1M
Stephen Couvillion, MD
$47.7M
Margaret Chang, M.D.
$47.6M
David Boyer, MD
$47.5M
Alessandro Castellarin, M.D.
$46.9M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Nathan Steinle, M.D.Santa Barbara, CA$63.1Mโœ“ Clear
Stephen Couvillion, MDSanta Barbara, CA$47.7Mโœ“ Clear
Margaret Chang, M.D.Sacramento, CA$47.6Mโœ“ Clear
David Boyer, MDLos Angeles, CA$47.5Mโœ“ Clear
Alessandro Castellarin, M.D.Santa Barbara, CA$46.9Mโœ“ Clear

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Data Sources

  • โ€ข Centers for Medicare & Medicaid Services (CMS)
  • โ€ข Medicare Provider Utilization and Payment Data (2014-2023)
  • โ€ข National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

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