MS-DRG · FY 2026 v43.0
MS-DRG 183 – Major Chest Trauma with MCC
A Medical DRG in MDC 04 (Diseases & Disorders of the Respiratory System). Inpatient cases group to DRG 183 when the ICD-10-CM principal diagnosis is one of the 61 codes listed below and a secondary diagnosis on the major complication or comorbidity (MCC) list is present. Its FY 2026 relative weight is 1.5299 with a geometric mean length of stay of 4.2 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
1.5299
Relative Weight
4.2
Geometric Mean LOS (days)
5.4
Arithmetic Mean LOS (days)
61
Principal Diagnosis Codes
Severity family
DRG 183with MCCWeight 1.5299 · GMLOS 4.2 daysDRG 184with CCWeight 1.0641 · GMLOS 3.1 daysDRG 185without CC/MCCWeight 0.7865 · GMLOS 2.3 days
How a case is assigned to DRG 183
The grouper first assigns the case to MDC 04 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 183; with CC → 184; without CC/MCC → 185.
ICD-10-CM
Principal Diagnosis Codes 61 codes · 6 categories
61 of 61 shown
M96 Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified1 code
- M96.A4 Flail chest associated with chest compression and cardiopulmonary resuscitation
M99 Biomechanical lesions, not elsewhere classified1 code
- M99.18 Subluxation complex (vertebral) of rib cage
S11 Open wound of neck6 codes
- S11.021A Laceration without foreign body of trachea, initial encounter
- S11.022A Laceration with foreign body of trachea, initial encounter
- S11.023A Puncture wound without foreign body of trachea, initial encounter
- S11.024A Puncture wound with foreign body of trachea, initial encounter
- S11.025A Open bite of trachea, initial encounter
- S11.029A Unspecified open wound of trachea, initial encounter
S22 Fracture of rib(s), sternum and thoracic spine13 codes
- S22.31XB Fracture of one rib, right side, initial encounter for open fracture
- S22.32XB Fracture of one rib, left side, initial encounter for open fracture
- S22.39XB Fracture of one rib, unspecified side, initial encounter for open fracture
- S22.41XA Multiple fractures of ribs, right side, initial encounter for closed fracture
- S22.41XB Multiple fractures of ribs, right side, initial encounter for open fracture
- S22.42XA Multiple fractures of ribs, left side, initial encounter for closed fracture
- S22.42XB Multiple fractures of ribs, left side, initial encounter for open fracture
- S22.43XA Multiple fractures of ribs, bilateral, initial encounter for closed fracture
- S22.43XB Multiple fractures of ribs, bilateral, initial encounter for open fracture
- S22.49XA Multiple fractures of ribs, unspecified side, initial encounter for closed fracture
- S22.49XB Multiple fractures of ribs, unspecified side, initial encounter for open fracture
- S22.5XXA Flail chest, initial encounter for closed fracture
- S22.5XXB Flail chest, initial encounter for open fracture
S27 Injury of other and unspecified intrathoracic organs22 codes
- S27.331A Laceration of lung, unilateral, initial encounter
- S27.332A Laceration of lung, bilateral, initial encounter
- S27.339A Laceration of lung, unspecified, initial encounter
- S27.401A Unspecified injury of bronchus, unilateral, initial encounter
- S27.402A Unspecified injury of bronchus, bilateral, initial encounter
- S27.409A Unspecified injury of bronchus, unspecified, initial encounter
- S27.411A Primary blast injury of bronchus, unilateral, initial encounter
- S27.412A Primary blast injury of bronchus, bilateral, initial encounter
- S27.419A Primary blast injury of bronchus, unspecified, initial encounter
- S27.421A Contusion of bronchus, unilateral, initial encounter
- S27.422A Contusion of bronchus, bilateral, initial encounter
- S27.429A Contusion of bronchus, unspecified, initial encounter
- S27.431A Laceration of bronchus, unilateral, initial encounter
- S27.432A Laceration of bronchus, bilateral, initial encounter
- S27.439A Laceration of bronchus, unspecified, initial encounter
- S27.491A Other injury of bronchus, unilateral, initial encounter
- S27.492A Other injury of bronchus, bilateral, initial encounter
- S27.499A Other injury of bronchus, unspecified, initial encounter
- S27.802A Contusion of diaphragm, initial encounter
- S27.803A Laceration of diaphragm, initial encounter
- S27.808A Other injury of diaphragm, initial encounter
- S27.809A Unspecified injury of diaphragm, initial encounter
S43 Dislocation and sprain of joints and ligaments of shoulder girdle18 codes
- S43.201A Unspecified subluxation of right sternoclavicular joint, initial encounter
- S43.202A Unspecified subluxation of left sternoclavicular joint, initial encounter
- S43.203A Unspecified subluxation of unspecified sternoclavicular joint, initial encounter
- S43.204A Unspecified dislocation of right sternoclavicular joint, initial encounter
- S43.205A Unspecified dislocation of left sternoclavicular joint, initial encounter
- S43.206A Unspecified dislocation of unspecified sternoclavicular joint, initial encounter
- S43.211A Anterior subluxation of right sternoclavicular joint, initial encounter
- S43.212A Anterior subluxation of left sternoclavicular joint, initial encounter
- S43.213A Anterior subluxation of unspecified sternoclavicular joint, initial encounter
- S43.214A Anterior dislocation of right sternoclavicular joint, initial encounter
- S43.215A Anterior dislocation of left sternoclavicular joint, initial encounter
- S43.216A Anterior dislocation of unspecified sternoclavicular joint, initial encounter
- S43.221A Posterior subluxation of right sternoclavicular joint, initial encounter
- S43.222A Posterior subluxation of left sternoclavicular joint, initial encounter
- S43.223A Posterior subluxation of unspecified sternoclavicular joint, initial encounter
- S43.224A Posterior dislocation of right sternoclavicular joint, initial encounter
- S43.225A Posterior dislocation of left sternoclavicular joint, initial encounter
- S43.226A Posterior dislocation of unspecified sternoclavicular joint, initial encounter
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 183 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 183?
MS-DRG 183 (Major Chest Trauma with MCC) is a medical DRG in MDC 04 (Diseases & Disorders of the Respiratory System). Its FY 2026 relative weight is 1.5299 with a geometric mean length of stay of 4.2 days.
What is the difference between DRG 183, 184, 185?
All 3 share the same base category; the severity of secondary diagnoses separates them: 183 (with MCC), 184 (with CC), 185 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many diagnosis codes group to DRG 183?
61 ICD-10-CM principal diagnosis codes group to this DRG, spanning 6 three-character categories.
What is the relative weight of DRG 183?
The FY 2026 relative weight of this DRG is 1.5299, meaning reimbursement of roughly 1.53 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
