ICD-10-CM 2027 diagnosis code
S42.413BDisplaced simple supracondylar fracture without intercondylar fracture of unspecified humerus, initial encounter for open fracture
S42.413B is a valid, billable ICD-10-CM code for displaced simple supracondylar fracture without intercondylar fracture of unspecified humerus, initial encounter for open fracture. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Displ simp suprcndl fx w/o intrcndl fx unsp humer, 7thB
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About S42.413B
S42.413B is the ICD-10-CM diagnosis code for displaced simple supracondylar fracture without intercondylar fracture of unspecified humerus, initial encounter for open fracture. It belongs to category S42 (fracture of shoulder and upper arm), block S40-S49 (injuries to the shoulder and upper arm) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "B" means initial encounter for open fracture: use it while the patient is receiving active treatment for the condition.
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC, relative weight 1.398), DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC, relative weight 0.8985), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and DRG 965 (Other Multiple Significant Trauma without CC/MCC, relative weight 1.0059), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue) and MDC 24 (Multiple Significant Trauma), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is an unspecified code for which a more specific option (often laterality) exists, and the Medicare Code Editor flags it for review on inpatient claims.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 812.51 (open supracondylar fracture of humerus).
7th character
Binitial encounter for open fracture
CC/MCC status for this injury by encounter: CC for A, K, P; MCC for B; Neither CC nor MCC for D, G, S.
Other encounter types for S42.413:
Notes that apply from higher levels
Instructions written at a parent level also apply to S42.413B.
Broader instructions also apply from S40-S49 Injuries to the shoulder and upper arm and Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 812.51Open supracondylar fracture of humerusapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about S42.413B
Is S42.413B billable?
- Yes. S42.413B is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "B" at the end of S42.413B mean?
- It is the 7th character for initial encounter for open fracture. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can S42.413B be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S42.413B as a principal diagnosis.
Is S42.413B a CC or MCC?
- S42.413B is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does S42.413B group to?
- S42.413B is used in the MS-DRG v44.0 logic for MS-DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC), MS-DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and MS-DRG 965 (Other Multiple Significant Trauma without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for S42.413B?
- The CMS General Equivalence Mappings map S42.413B to ICD-9-CM 812.51.