S23.9XXA (Sprain of unspecified parts of thorax, initial encounter) compared with S29.01 (Strain of muscle and tendon of thorax), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Distinct conditions — both may be reported.
“strain of muscle or tendon of thorax (S29.01-)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
Yes, when both are documented. S23.9XXA carries an Excludes2 note covering S29.01: “strain of muscle or tendon of thorax (S29.01-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| S23.9XXASprain of unspecified parts of thorax, initial encounter | S29.01Strain of muscle and tendon of thorax | |
|---|---|---|
| Billing status | Billable | Non-billable header Report instead: S29.011A, S29.011D, S29.011S, S29.012A, S29.012D |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Sprain of unspecified parts of thorax, initial encounter is a billable ICD-10-CM diagnosis code (S23.9A). | Strain of muscle and tendon of thorax is a non-billable ICD-10-CM category code (S29.01). |
| 7th character | The appropriate 7th character is to be added to each code from category S23 | The appropriate 7th character is to be added to each code from category S29 |
| Includes | avulsion of joint or ligament of thorax laceration of cartilage, joint or ligament of thorax sprain of cartilage, joint or ligament of thorax traumatic hemarthrosis of joint or ligament of thorax | injuries of breast injuries of chest (wall) injuries of interscapular area |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources