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ICD-10-CM 2027 diagnosis code

X78.1XXAIntentional self-harm by knife, initial encounter

✓ Billable / specificRequires 7th character

X78.1XXA is a valid, billable ICD-10-CM code for intentional self-harm by knife, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 X78.1XXA

X78.1XXA is the ICD-10-CM diagnosis code for intentional self-harm by knife, initial encounter. It belongs to category X78 (intentional self-harm by sharp object), block X71-X83 (intentional self-harm) and chapter 20 (external causes of morbidity). 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.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

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 E956 (suicide and self-inflicted injury by cutting and piercing instrument).

7th character

Ainitial encounter

Other encounter types for X78.1:

Notes that apply from higher levels

Instructions written at a parent level also apply to X78.1XXA.

Broader instructions also apply from X71-X83 Intentional self-harm and Chapter 20: External causes of morbidity.

ICD-9-CM equivalent

Converter →
  • E956Suicide and self-inflicted injury by cutting and piercing instrumentapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about X78.1XXA

Is X78.1XXA billable?

Yes. X78.1XXA 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 X78.1XXA 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 X78.1XXA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict X78.1XXA as a principal diagnosis.

Is X78.1XXA a CC or MCC?

No. X78.1XXA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for X78.1XXA?

The CMS General Equivalence Mappings map X78.1XXA to ICD-9-CM E956.