Medicare Enrolled
Dr. Tony Chang, MD
Sports Medicine (Family Medicine) Physician · Redding, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-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. Tony Chang is a sports medicine physician in Redding, CA, with 18 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 26,606 Medicare services across 4,536 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $1,804 from 15 pharmaceutical and/or device companies across 90 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in sports medicine (family medicine) physician. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. 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.
✓ 18 years in practice
▲ Top 2% volume in CA
$1,804 industry payments
Medicare Practice Summary
Medicare Utilization ↗26,606
Medicare services
Top 2% in CA for sports medicine (family medicine) physician
4,536
Unique beneficiaries
$23
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~1,478 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 |
|---|---|---|---|
| Joint lubricant injection (TriVisc) An injection of hyaluronan or a derivative into a joint space. The dose specified is 1 milligram. |
11,850 | $7 | $30 |
| Extended-release steroid injection (Zilretta) An injection of triamcinolone acetonide using a preservative-free, extended-release microsphere formulation. The dosage is measured in milligrams. |
4,096 | $13 | $45 |
| Hyaluronan joint injection, 1 mg An injection of hyaluronan or a derivative into a joint space to supplement joint fluid. |
2,100 | $19 | $31 |
| Contrast dye for imaging (iodine-based) A contrast agent containing 300-399 mg/ml of iodine used to enhance imaging studies. It is administered per milliliter to improve the visibility of internal structures. |
1,534 | $0 | $1 |
| Betamethasone steroid injection An injection containing a combination of betamethasone acetate and betamethasone sodium phosphate. |
1,112 | $5 | $18 |
| Ultrasound-guided large joint aspiration or injection This procedure uses ultrasound imaging to guide the removal of fluid from or the injection of medication into a large joint. |
866 | $73 | $262 |
| 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. |
790 | $69 | $236 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
752 | $0 | $1 |
| 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. |
733 | $98 | $335 |
| 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. |
285 | $115 | $434 |
| 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. |
212 | $81 | $291 |
| Knee X-ray, 4 or more views An imaging test using X-rays to create multiple pictures of the knee joint from different angles. |
153 | $36 | $145 |
| Contrast injection for shoulder joint imaging A contrast dye is injected into the shoulder joint to enhance imaging studies. This helps visualize the joint structures more clearly during the procedure. |
149 | $136 | $461 |
| Radiologist review of shoulder joint image A radiologist examines and interprets images of the shoulder joint to assess its condition. |
148 | $112 | $363 |
| Shoulder X-ray, 2+ views An X-ray imaging test of the shoulder joint using at least two different angles to visualize the bones and surrounding structures. |
141 | $27 | $128 |
| Hip joint contrast injection for imaging A contrast dye is injected into the hip joint to enhance visibility during medical imaging procedures. |
119 | $189 | $658 |
| Radiologist review of hip joint image A radiologist examines and interprets an image of the hip joint to assess its condition. |
116 | $111 | $369 |
| Functional activity therapy A therapy procedure that utilizes functional activities as part of the treatment process. |
102 | $23 | $100 |
| Joint injection, major joint Removal of fluid from a large joint and/or injection of medication into the joint space. |
84 | $48 | $200 |
| Additional sacral spine nerve root injection with imaging An injection of anesthetic and/or steroid medication into an additional sacral spine nerve root level, guided by imaging. |
81 | $97 | $338 |
| X-ray of hand, minimum of 3 views An X-ray imaging test of the hand that captures at least three different angles to visualize the bones and joints. |
72 | $30 | $111 |
| X-ray of lower and sacral spine, minimum 6 views An X-ray imaging test that captures at least six views of the lower back and sacral spine to evaluate bone structure and alignment. |
65 | $49 | $248 |
| Sacral spine nerve root injection with imaging guidance An injection of anesthetic and/or steroid medication into a sacral spine nerve root. The procedure uses imaging guidance to ensure accurate placement. |
63 | $210 | $768 |
| Fluoroscopic guidance for needle placement Use of real-time X-ray imaging to guide the precise placement of a needle during a medical procedure. |
61 | $95 | $318 |
| Injection of anesthetic or steroid into sacroiliac joint with imaging guidance This procedure involves injecting an anesthetic or steroid medication into the joint connecting the lower spine and hip bone. Imaging guidance is used to ensure accurate placement of the injection. |
58 | $132 | $643 |
| X-ray of both knees, standing An X-ray image of both knees taken while the patient is standing to assess bone alignment and joint space under weight-bearing conditions. |
53 | $33 | $128 |
| Trigger point injection, 1-2 muscles A procedure involving the injection of medication into one or two specific muscles to treat trigger points. |
51 | $40 | $177 |
| MRI of lower spine, without contrast A magnetic resonance imaging scan of the lower spinal canal that does not use contrast dye to create detailed images of the spine. |
51 | $109 | $1,277 |
| Manual therapy (hands-on treatment), per 15 min | 50 | $14 | $79 |
| Contrast injection for wrist imaging A contrast dye is injected into the wrist to enhance visibility during an imaging procedure. |
47 | $157 | $557 |
| Radiologist review of wrist joint image A radiologist examines and interprets an image of the wrist joint to assess its condition. |
47 | $113 | $377 |
| Spine facet joint injection with imaging guidance, single level An injection is administered into a single facet joint of the lower or sacral spine while using imaging guidance to ensure accurate placement. |
43 | $197 | $789 |
| Facet joint injection, second level, with imaging guidance An injection into a lower or sacral spine facet joint using imaging guidance for the second level treated. |
43 | $101 | $396 |
| Viscosupplementation injection for joint An injection of hyaluronic acid or a derivative into a joint to provide lubrication and cushioning. |
42 | $58 | $197 |
| Steroid injection (triamcinolone) A 10 mg injection of triamcinolone acetonide, a corticosteroid medication. This code specifies the drug and dosage administered. |
40 | $1 | $3 |
| Hip X-ray, 2-3 views An X-ray imaging test of the hip joint using two to three different angles to visualize the bones and surrounding structures. |
39 | $35 | $128 |
| MRI of leg joint, without contrast A magnetic resonance imaging scan of a joint in the leg performed without the use of contrast dye. |
36 | $119 | $1,161 |
| Wrist X-ray, minimum 3 views An imaging test using X-rays to capture at least three different angles of the wrist bones and joints. |
32 | $28 | $125 |
| Injection into lower spine canal with imaging guidance A procedure where a substance is injected into the lower part of the spinal canal. The injection is performed using imaging guidance to ensure accurate placement. |
31 | $208 | $717 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
31 | $137 | $470 |
| 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. |
30 | $27 | $108 |
| Joint fluid aspiration or injection, small joint Removal of fluid from a small joint or injection of medication into a small joint. |
22 | $33 | $140 |
| MRI of arm joint, without contrast An MRI scan uses magnetic fields and radio waves to create detailed images of the arm joint. This specific procedure is performed without the use of a contrast dye. |
20 | $120 | $1,161 |
| Hip X-ray, minimum 4 views An X-ray imaging test of the hip joint using at least four different angles to visualize the bones and surrounding structures. |
20 | $49 | $161 |
| Tendon injection at attachment site A procedure involving the injection of medication into a tendon where it attaches to bone or muscle. |
19 | $42 | $159 |
| MRI contrast dye injection (gadoterate) Administration of gadoterate meglumine, a contrast agent, in a 0.1 ml dose. |
19 | $0 | $0 |
| Tendon or ligament injection A procedure involving the injection of medication into a tendon or ligament. |
16 | $44 | $156 |
| 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. |
16 | $30 | $114 |
| Elbow X-ray, minimum 3 views An X-ray imaging test of the elbow joint that captures at least three different angles to visualize the bones and surrounding structures. |
15 | $26 | $126 |
| Office visit, established patient (10-19 min) An office visit for an existing patient lasting 10 to 19 minutes. The visit involves medical evaluation and management of the patient's condition. |
14 | $38 | $122 |
| Trigger point injection, 3 or more muscles Injection of medication into three or more specific muscle trigger points to relieve pain. |
13 | $50 | $192 |
| X-ray of upper spine, 6 or more views An X-ray imaging test of the upper spine using six or more separate views to capture detailed images of the bones and structures in that area. |
12 | $49 | $204 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
12 | $67 | $237 |
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.
Industry Payment Transparency
Open Payments through 2024 ↗$1,804
Total received (2018-2024)
Avg $258/year across 7 years
Top 22% in CA for sports medicine (family medicine) physician
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
15
Companies
90
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.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$1,804 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$105
2023
$190
2022
$276
2021
$282
2020
$373
2019
$389
2018
$189
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Pacira Pharmaceuticals Incorporated
$88
Bioventus LLC
$17
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
Bioventus LLC
$514
Flexion Therapeutics, Inc.
$468
Pacira Pharmaceuticals Incorporated
$181
Pacira Therapeutics, Inc.
$132
Lilly USA, LLC
$101
UCB, Inc.
$86
FIDIA PHARMA USA INC.
$57
DePuy Synthes Sales Inc.
$53
Ferring Pharmaceuticals Inc.
$47
Assertio Therapeutics, Inc.
$44
ASSERTIO THERAPEUTICS, Inc.
$33
Steelhead Surgical Inc
$30
Boston Scientific Corporation
$28
BOSTON SCIENTIFIC CORPORATION
$17
Collegium Pharmaceutical, Inc.
$13
Top 3 companies account for 64.5% of all-time payments
Associated products mentioned in payments ›
Cimzia · Durolane · EMGALITY · EUFLEXXA · Exogen · Exogen Ultrasound Bone Healing System · Exparel · GELSYN 3 · GELSYN-3 · GENERAL - THERAPIES · GRALISE · Gralise · HYALGAN · Hymovis · Iovera · MONOVISC · ORTHOVISC · SPECTRA WAVEWRITER · SUPARTZ FX SODIUM HYALURONATE · TALTZ · Xtampza ER · Zilretta · Zipsor
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 →
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Sports medicine physicians within 10 mi
1
Per 100K population
0.6
County median income
$71,931
Nearest hospital
MERCY MEDICAL CENTER REDDING
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 mixed practice specialist, with above-average Medicare volume (top 2% in CA), with low-engagement industry engagement, with 18 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 joint lubricant injection (trivisc)?
Based on Medicare claims data, Dr. Chang performed 11,850 joint lubricant injection (trivisc) 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 $1,804 from 15 companies across 90 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 sports medicine physicians in Redding?
Dr. Chang's average Medicare payment per service is $23. 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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