ICD-10-CM 2027 diagnosis code
S45.899AOther specified injury of other specified blood vessels at shoulder and upper arm level, unspecified arm, initial encounter
S45.899A is a valid, billable ICD-10-CM code for other specified injury of other specified blood vessels at shoulder and upper arm level, unspecified arm, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Inj oth blood vessels at shldr/up arm, unsp arm, init
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 S45.899A
S45.899A is the ICD-10-CM diagnosis code for other specified injury of other specified blood vessels at shoulder and upper arm level, unspecified arm, initial encounter. It belongs to category S45 (injury of blood vessels at shoulder and upper arm level), 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 "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" 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 913 (Traumatic Injury with MCC, relative weight 1.5455), DRG 914 (Traumatic Injury without MCC, relative weight 0.9285), 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 21 (Injuries, Poisonings and Toxic Effects of Drugs) 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 903.00 (injury to axillary vessel(s), unspecified) and 903.8 (injury to other specified blood vessels of upper extremity).
7th character
Ainitial encounter
CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.
Other encounter types for S45.899:
Notes that apply from higher levels
Instructions written at a parent level also apply to S45.899A.
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 21 · Injuries, Poisonings and Toxic Effects of Drugs
ICD-9-CM equivalent
Converter →- 903.00Injury to axillary vessel(s), unspecifiedapproximate
- 903.8Injury to other specified blood vessels of upper extremityapproximate
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 S45.899A
Is S45.899A billable?
- Yes. S45.899A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of S45.899A mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can S45.899A be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S45.899A as a principal diagnosis.
Is S45.899A a CC or MCC?
- S45.899A is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does S45.899A group to?
- S45.899A is used in the MS-DRG v44.0 logic for MS-DRG 913 (Traumatic Injury with MCC), MS-DRG 914 (Traumatic Injury 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 S45.899A?
- The CMS General Equivalence Mappings map S45.899A to ICD-9-CM 903.00 and 903.8.