Covered recipient · General Payments record
MARK K CHANG
Allopathic & Osteopathic Physicians Orthopaedic Surgery
General Payments · PY2018–2024
$143,172.71
- Reported across 144 records
- CMS publication 2026-01-23
Financial relationships do not necessarily indicate an improper relationship; the data is open to interpretation.
How these totals are calculated
- The total is the sum of the General Payments records CMS published for the labeled program year(s), exactly as published. Nothing is estimated, weighted, or combined across categories.
- General Payments only. Research and Ownership/Investment are separate datasets and are never summed with these figures; amounts are kept separate per program year.
- Featured-page threshold (a presentation gate, not a judgment): records>=3 OR total>=100 (all years).
- Methodology & Data — sourcing, labeling, and limitations.
By nature of payment
PY2024 · sorted by reported total
| Nature of payment | Amount | Records |
|---|---|---|
| Consulting Fee | $32,000.00 | 1 |
| Food and Beverage | $716.80 | 19 |
By paying entity
PY2024 · sorted by reported total
| Paying entity | Amount | Records |
|---|---|---|
| Medyssey USA, Inc | $32,000.00 | 1 |
| Abbott Laboratories | $633.15 | 16 |
| Carlsmed, Inc. | $42.73 | 1 |
| ABBVIE INC. | $26.78 | 1 |
| Stryker Corporation | $14.14 | 1 |
By program year
All program years on this page · sorted by year
Payment records · PY2024 (20)
Sorted by paying entity, then date · as published by CMS
Program year 2024 201820192020202120222023
Record-level detail is published for PY2024; earlier years are summarised in
“By program year”.
| Paying entity | Amount | Date | Nature of payment | Dispute status | Published | Record ID | Source |
|---|---|---|---|---|---|---|---|
| Abbott Laboratories | $10.41 | 01/05/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314834 | CMS |
| Abbott Laboratories | $23.60 | 01/05/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314836 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314838 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314840 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314842 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314844 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314846 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314848 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314850 | CMS |
| Abbott Laboratories | $66.21 | 03/11/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314852 | CMS |
| Abbott Laboratories | $6.67 | 03/12/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314854 | CMS |
| Abbott Laboratories | $32.46 | 05/24/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314856 | CMS |
| Abbott Laboratories | $5.23 | 10/01/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314858 | CMS |
| Abbott Laboratories | $15.28 | 10/01/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314860 | CMS |
| Abbott Laboratories | $5.33 | 11/01/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314862 | CMS |
| Abbott Laboratories | $4.49 | 11/01/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1125314864 | CMS |
| ABBVIE INC. | $26.78 | 06/13/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1103441950 | CMS |
| Carlsmed, Inc. | $42.73 | 10/08/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1143597619 | CMS |
| Medyssey USA, Inc | $32,000.00 | 10/10/2024 | Consulting Fee | Undisputed | 01/23/2026 | 1148638425 | CMS |
| Stryker Corporation | $14.14 | 08/09/2024 | Food and Beverage | Undisputed | 01/23/2026 | 1119795454 | CMS |
Source & provenance
- Dataset
- CMS Open Payments — General Payments
- Publisher of source data
- Centers for Medicare & Medicaid Services
- CMS publication date
- 2026-01-23
- Program years on this page
- 2018, 2019, 2020, 2021, 2022, 2023, 2024
- Source files
- Dataset page · Bulk file · PY2018 , PY2019 , PY2020 , PY2021 , PY2022 , PY2023 , PY2024
- Generated from
- OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv
One page per canonical provider; split Profile_IDs are merged via Associated_Covered_Recipient_Profile_ID_1/_2 from the Covered Recipient Profile Supplement.
Corrections to the substance of a record route to CMS through its review-and-dispute process; errors in how this site mirrors or displays a record route to us. Both paths are described in Methodology & Data.