Medicare Enrolled
Dr. Thomas Chang, D.P.M.
Foot & Ankle Surgery Podiatrist · Santa Rosa, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Mixed engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Chang from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Chang
Dr. Thomas Chang is a foot & ankle surgery podiatrist in Santa Rosa, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 3,662 Medicare services across 2,253 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $2,411,785 from 41 pharmaceutical and/or device companies across 518 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in foot & ankle surgery podiatrist. The majority of payments are classified as financial or ownership interests (royalties, licensing fees, or investment interests). Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 19 years in practice
▲ Top 16% volume in CA
$2,411,785 industry payments
Medicare Practice Summary
Medicare Utilization ↗3,662
Medicare services
Top 16% in CA for foot & ankle surgery podiatrist
2,253
Unique beneficiaries
$57
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~193 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
1,017 | $73 | $324 |
| Foot X-ray, 3+ views An X-ray imaging test of the foot that captures at least three different views to evaluate the bones and joints. |
738 | $30 | $136 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
297 | $87 | $397 |
| Steroid injection (triamcinolone) A 10 mg injection of triamcinolone acetonide, a corticosteroid medication. This code specifies the drug and dosage administered. |
276 | $1 | $15 |
| Ankle X-ray, minimum 3 views An X-ray imaging test of the ankle that captures at least three different angles to evaluate the bones and joints. |
257 | $33 | $146 |
| Functional capacity test, per 15 minutes A test or measurement to assess functional capacity. The service is billed for each 15-minute increment. |
182 | $25 | $108 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
170 | $104 | $456 |
| Joint fluid aspiration or injection, medium joint Removal of fluid from a medium-sized joint or injection of medication into the joint space. |
93 | $47 | $197 |
| Toenail/fingernail removal, 6+ nails Surgical removal of six or more fingernails or toenails. This procedure involves the excision of multiple nails during a single session. |
85 | $37 | $162 |
| Short leg cast application Application of a cast to the lower leg to immobilize and support the area during healing. |
78 | $67 | $290 |
| Removal of noncancer thickened skin growth, 1 growth This procedure involves the removal of a single benign, thickened skin growth. It is a minor surgical intervention to eliminate the lesion. |
72 | $63 | $285 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
65 | $137 | $586 |
| Removal of thickened skin growths, 2-4 This procedure involves the removal of two to four benign, thickened skin growths. It is a minor surgical intervention to eliminate non-cancerous skin lesions. |
60 | $74 | $324 |
| X-ray of foot, 2 views An X-ray imaging test of the foot using two different angles to create pictures of the bones and joints. |
48 | $25 | $110 |
| Adult fiberglass short leg cast supplies Materials used to apply a fiberglass cast to the lower leg for an adult patient. |
40 | $36 | $80 |
| Joint fluid aspiration or injection, small joint Removal of fluid from a small joint or injection of medication into a small joint. |
32 | $41 | $209 |
| Correction of toe joint deformity A surgical procedure to correct a deformity in a toe joint. This involves realigning the joint structure to restore proper function and appearance. |
32 | $201 | $1,987 |
| Foot nerve injection with anesthetic and/or steroid An injection of an anesthetic and/or steroid medication into a nerve in the foot. |
30 | $39 | $181 |
| Tendon or ligament injection A procedure involving the injection of medication into a tendon or ligament. |
28 | $48 | $213 |
| Toenail/fingernail removal, 1-5 nails This procedure involves the removal of one to five fingernails or toenails. |
19 | $29 | $120 |
| Big toe joint fusion with foot Surgical procedure to fuse the big toe joint to the foot. This stabilizes the joint by connecting the bones. |
16 | $490 | $2,878 |
| Simple separation of fingernail or toenail from nail bed, first nail A procedure to separate the first fingernail or toenail from the underlying nail bed. |
14 | $91 | $438 |
| Partial removal of foot bone to straighten toe A surgical procedure involving the incision or partial removal of a foot bone, excluding the big toe, to correct toe alignment. |
13 | $244 | $2,124 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
0.4% high complexity
12.5% medium
87.0% routine
Industry Payment Transparency
Open Payments through 2024 ↗$2,411,785
Total received (2018-2024)
Avg $344,541/year across 7 years
Top 0% in CA for foot & ankle surgery podiatrist
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
41
Companies
518
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Financial / Ownership
Ownership or investment interests, royalties, and licensing fees
$1,758,781 (72.9%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$604,246 (25.1%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$41,562 (1.7%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$7,196 (0.3%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$117,164
2023
$206,074
2022
$326,336
2021
$471,124
2020
$422,327
2019
$464,014
2018
$404,745
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Paragon 28, Inc.
$35,304
DePuy Synthes Products, Inc.
$34,253
Bioventus LLC
$18,738
OSSIO INC
$17,320
Medical Device Business Services, Inc.
$9,684
Stryker Corporation
$539
DePuy Synthes Sales Inc.
$395
Nevro Corp.
$201
Alafair Biosciences, Inc.
$177
MIMEDX Group, Inc.
$145
Abbott Laboratories
$120
Carbofix Orthopedics Inc
$111
Trimed, Inc.
$84
ConvaTec Inc.
$30
Evolution Surgical, Inc
$24
Smith+Nephew, Inc.
$20
Electronic Waveform Lab, Inc.
$19
Top 3 companies account for 75.4% of 2024 payments
All-time payments by company (2018-2024) ›
Paragon 28, Inc.
$1,381,192
DePuy Synthes Products, Inc.
$598,733
DePuy Synthes Products LLC
$119,671
OSSIO INC
$90,470
Stryker Corporation
$77,062
Bioventus LLC
$43,144
CROSSROADS EXTREMITY SYSTEMS, LLC
$30,257
Medical Device Business Services, Inc.
$22,844
DePuy Synthes Sales Inc.
$16,841
Cartiva, Inc.
$16,485
Wright Medical Technology, Inc.
$6,489
Synthes USA Products LLC
$1,780
Musculoskeletal Transplant Foundation Inc.
$1,438
Evolution Surgical, Inc
$1,139
ActivOrtho, Inc.
$550
TREACE MEDICAL CONCEPTS, INC.
$372
Abbott Laboratories
$363
Zimmer Biomet Holdings, Inc.
$281
Osiris Therapeutics Inc.
$239
Smith+Nephew, Inc.
$231
Nevro Corp.
$201
EVOLUTION SURGICAL, INC
$195
WRIGHT MEDICAL TECHNOLOGY, INC.
$179
Alafair Biosciences, Inc.
$177
Integra LifeSciences Corporation
$169
Derma Sciences, Inc.
$148
MIMEDX Group, Inc.
$145
ENCORE MEDICAL, LP
$144
Melinta Therapeutics, Inc.
$129
Treace Medical Concepts, Inc.
$125
Carbofix Orthopedics Inc
$111
Lifenet Health
$101
Trimed, Inc.
$84
Organogenesis Inc.
$70
AXOGEN
$69
OSSIO Inc.
$38
ConvaTec Inc.
$30
ORGANOGENESIS INC.
$24
Curonix LLC
$24
Ethicon US, LLC
$20
Electronic Waveform Lab, Inc.
$19
Top 3 companies account for 87.1% of all-time payments
Associated products mentioned in payments ›
ACCULIF · ALLOMATRIX · ALLOWRAP · AMNIOEXCEL · ANCHORAGE · APEX · APEX 3D · APEX3D · AQUACEL FOAM · ASNIS · AUGMENT · AUGMENT INJECTABLE · AVANCE NERVE GRAFT · AXSOS · Additive Orthopedics · Affixus · Ankle Fractures · Apex 3D · BIO4 · BME NITINOL CONTINUOUS COMPRESSION IMPLANTS · Baxdela · Biomet SpinalPak · CADENCE ANKLE REPLACEMENT SYSTEM · CARTIVA · COLLAGENASE SANTYL · CROSSTIE · Cadence · Cartiva · DJO SURGICAL · Durolane · EASY CLIP · EXOGEN ULTRASOUND BONE HEALING SYSTEM · Exogen · Exogen Ultrasound Bone Healing System · Extremities Instruments · FIBERGRAFT Aeridyan Matrix · FIBULINK · Foot and Ankle · Foot and Ankle Implants · GAMMA · GRAFTJACKET · Gorilla Plating System · HAMMERLOCK · HOFFMANN · HYDROSET · INFINITY ADAPTIS · INNOVAMATRIX AC · LAPIPLASTY SYSTEM · Lapidus Nail · Lapidus System · Lapiplasty System · Lateral Ankle · MOTOBAND · Medial Column Plating · Medical Implant · Nextremity MSP · NuShield · ORTHOLOC 3DI CROSSCHECK · OSSIOFIBER BONE PIN · P28 PRODUCT PORTFOLIO · PARATROOPER · PNS FREEDOM-4A PERMANENT NEUROSTIMULATOR RECEIVER KIT CHANNEL A · PORTFOLIO · PRO-DENSE · PROCLAIM · PRODUCT PORTFOLIO · PROPHECY · PROSTEP MICA · Phantom Nail · Portfolio · Proclaim Family of SCS IPGs · Product Portfolio · Puraply Antimicrobial · Renasys · SALTO TALARIS TOTAL ANKLE PROSTHESIS · SMART TOE · STAR · STRATAFIX · Senza · Stravix · T2 · TRIATHLON · Titan Wedges · Tools - WFS · VARIAX · VersaWrap
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Payments are distributed across multiple categories with no single dominant type. Total industry engagement is in the top 0% for foot & ankle surgery podiatrist in CA.
Geographic Context
Foot & ankle surgery podiatrists within 10 mi
14
Per 100K population
2.9
County median income
$102,840
Nearest hospital
SUTTER SANTA ROSA REGIONAL HOSPITAL
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Chang is a clinical cardiology specialist, with above-average Medicare volume (top 16% in CA), with mixed engagement industry engagement in the top 0% of CA peers, with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Chang experienced with office visit, established patient (20-29 min)?
Based on Medicare claims data, Dr. Chang performed 1,017 office visit, established patient (20-29 min) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $2,411,785 from 41 companies across 518 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Chang's costs compare to other foot & ankle surgery podiatrists in Santa Rosa?
Dr. Chang's average Medicare payment per service is $57. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Chang) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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