S23.42 ICD-10-CM Code: Sprain of sternum
S23.42 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Injury, poisoning and certain other consequences of external causes (S00-T88) / Injuries to the thorax (S20-S29)
S23.42
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceSprain of sternum
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for S23.42. Check the code and parent instructions in the Code Book.
Excludes 2
Official- birth trauma (P10-P15)Inherited from S00-T88, S20-S29, S23
- obstetric trauma (O70-O71)Inherited from S00-T88, S20-S29, S23
- burns and corrosions (T20-T32)Inherited from S00-T88, S20-S29, S23
- effects of foreign body in bronchus (T17.5)Inherited from S00-T88, S20-S29, S23
- effects of foreign body in esophagus (T18.1)Inherited from S00-T88, S20-S29, S23
- effects of foreign body in lung (T17.8)Inherited from S00-T88, S20-S29, S23
- effects of foreign body in trachea (T17.4)Inherited from S00-T88, S20-S29, S23
- frostbite (T33-T34)Inherited from S00-T88, S20-S29, S23
- injuries of axillaInherited from S00-T88, S20-S29, S23
- injuries of clavicleInherited from S00-T88, S20-S29, S23
- injuries of scapular regionInherited from S00-T88, S20-S29, S23
- injuries of shoulderInherited from S00-T88, S20-S29, S23
- insect bite or sting, venomous (T63.4)Inherited from S00-T88, S20-S29, S23
- dislocation, sprain of sternoclavicular joint (S43.2, S43.6)Inherited from S00-T88, S20-S29, S23
- strain of muscle or tendon of thorax (S29.01-)Inherited from S00-T88, S20-S29, S23
Related Codes
Includes
Official- injuries of breastInherited from S20-S29, S23
- injuries of chest (wall)Inherited from S20-S29, S23
- injuries of interscapular areaInherited from S20-S29, S23
- avulsion of joint or ligament of thoraxInherited from S20-S29, S23
- laceration of cartilage, joint or ligament of thoraxInherited from S20-S29, S23
- sprain of cartilage, joint or ligament of thoraxInherited from S20-S29, S23
- traumatic hemarthrosis of joint or ligament of thoraxInherited from S20-S29, S23
- traumatic rupture of joint or ligament of thoraxInherited from S20-S29, S23
- traumatic subluxation of joint or ligament of thoraxInherited from S20-S29, S23
- traumatic tear of joint or ligament of thoraxInherited from S20-S29, S23
Excludes 1
OfficialNo Excludes 1 notes are included in this display for S23.42. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for S23.42. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify any retained foreign body, if applicable (Z18.-)Inherited from S00-T88
Code Also
Official- any associated open woundInherited from S23
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- S23.42
- Description
- Sprain of sternum
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
S23.42 is the ICD-10-CM diagnosis code for sprain of sternum. S23.42 sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering injuries to the thorax (s20-s29).
Header codes like S23.42 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for S23.42 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.