X78.9XXD ICD-10-CM Code: Intentional self-harm by unspecified sharp object, subsequent encounter

7th Character Guide

"The appropriate 7th character is to be added to each code from category X78"

• A — initial encounter
• D — subsequent encounter (this page’s code)
• S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

X78.9XXA, X78.9XXD, X78.9XXS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Do Not Confuse With

Codes named in X78.9XXD's own official notes, or sharing its encounter family, with what separates them. Each links to the full comparison.

• X78.9XXA— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  Full comparison: X78.9XXD vs X78.9XXA →

• X78.9XXS— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  Full comparison: X78.9XXD vs X78.9XXS →

Relationships are read from this code's own official notes and its encounter family; the wording of each distinction is MedCoder editorial. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• Principal-diagnosis restriction. External cause of morbidity codes (V, W, X and Y) describe the circumstance that caused an injury, not the condition treated. The Medicare Code Editor rejects them as a principal diagnosis; sequence the injury or condition first and report this code as secondary.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

Other codes that name X78.9XXD or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 27 Excludes1 notes: W20 — Struck by thrown, projected or falling object (via X78.-), W20-W49 — Exposure to inanimate mechanical forces (W20-W49) (via X78.-), W21 — Striking against or struck by sports equipment (via X78.-), W22 — Striking against or struck by other objects (via X78.-), W23 — Caught, crushed, jammed or pinched in or between objects (via X78.-), W24 — Contact with lifting and transmission devices, not elsewhere classified (via X78.-), W25 — Contact with sharp glass (via X78.-), W26 — Contact with other sharp objects (via X78.-), W27 — Contact with nonpowered hand tool (via X78.-), W28 — Contact with powered lawn mower (via X78.-), W29 — Contact with other powered hand tools and household machinery (via X78.-), W30 — Contact with agricultural machinery (via X78.-), W31 — Contact with other and unspecified machinery (via X78.-), W32 — Accidental handgun discharge and malfunction (via X78.-), W33 — Accidental rifle, shotgun and larger firearm discharge and malfunction (via X78.-), W34 — Accidental discharge and malfunction from other and unspecified firearms and guns (via X78.-), W35 — Explosion and rupture of boiler (via X78.-), W36 — Explosion and rupture of gas cylinder (via X78.-), W37 — Explosion and rupture of pressurized tire, pipe or hose (via X78.-), W38 — Explosion and rupture of other specified pressurized devices (via X78.-), +7 more.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Clinical classification (AHRQ CCSR):EXT029 — External cause codes: subsequent encounter; MBD027 — Suicide attempt/intentional self-harm; subsequent encounter.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (External cause codes: subsequent encounter, Suicide attempt/intentional self-harm; subsequent encounter).

+2644 more

Contextual Map

Every relationship of X78.9XXD in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run X78.9XXD with these 8 related codes in Claim Check

Hierarchy

• V00-Y99 — Chapter 20: External Causes of Morbidity (V00-Y99) (V00-Y99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X71-X83 — Intentional self-harm[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes (27)

• W20 — Struck by thrown, projected or falling object[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W20-W49 — Exposure to inanimate mechanical forces (W20-W49)[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W21 — Striking against or struck by sports equipment[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W22 — Striking against or struck by other objects[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W23 — Caught, crushed, jammed or pinched in or between objects[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W24 — Contact with lifting and transmission devices, not elsewhere classified[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W25 — Contact with sharp glass[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• W26 — Contact with other sharp objects[Excludes1](via X78.-): “intentional self-harm (X71-X83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 19 more

Clinical classification (CCSR)

• EXT029 — External cause codes: subsequent encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)
• MBD027 — Suicide attempt/intentional self-harm; subsequent encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Nearest codes (20)

• X78 — Intentional self-harm by sharp object[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.0 — Intentional self-harm by sharp glass[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.0XXA — Intentional self-harm by sharp glass, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.0XXD — Intentional self-harm by sharp glass, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.0XXS — Intentional self-harm by sharp glass, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.1 — Intentional self-harm by knife[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.1XXA — Intentional self-harm by knife, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• X78.1XXD — Intentional self-harm by knife, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 12 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to X78.9XXD in its code family, with their registry titles.

• X78.2XXA — Intentional self-harm by sword or dagger, initial encounter
• X78.2XXD — Intentional self-harm by sword or dagger, subsequent encounter
• X78.2XXS — Intentional self-harm by sword or dagger, sequela
• X78.8 — Intentional self-harm by other sharp object
• X78.8XXA — Intentional self-harm by other sharp object, initial encounter
• X78.8XXD — Intentional self-harm by other sharp object, subsequent encounter
• X78.8XXS — Intentional self-harm by other sharp object, sequela
• X78.9 — Intentional self-harm by unspecified sharp object
• X78.9XXA — Intentional self-harm by unspecified sharp object, initial encounter
• X78.9XXS — Intentional self-harm by unspecified sharp object, sequela

View all codes in the X78 family