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I63.8 ICD-10-CM Code: Other cerebral infarction

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Coding at a Glance

Tabular directives
1 inclusion term · 2 Excludes1 · 2 Excludes2 · 10 use-additional codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for I63.8 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on I63.8 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction

Source: inherited from I63

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from I63

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82) inherited from I63
  • Use additional code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-) inherited from I63
  • Use additional code to identify presence of:
  • alcohol abuse and dependence (F10.-) inherited from I60-I69
  • exposure to environmental tobacco smoke (Z77.22) inherited from I60-I69
  • history of tobacco dependence (Z87.891) inherited from I60-I69
  • hypertension (I10-I1A) inherited from I60-I69
  • occupational exposure to environmental tobacco smoke (Z57.31) inherited from I60-I69
  • tobacco dependence (F17.-) inherited from I60-I69
  • tobacco use (Z72.0) inherited from I60-I69

Coder workflow for I63.8

MedCoder structured workflow — derived from this code’s own official record

Before you code I63.8

  1. I63.8 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewI63.81, I63.89

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on I63.8; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewI63.6

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with I63.8. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath I63.8?
    Yes → Select that code and continue the checks below on its own page.
    No → I63.8 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewI63.81, I63.89

  2. Does the documentation support a condition named in I63.8’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewP91.82, S06

Consider I63.8. Then work the Use Additional Code note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting I63.8(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with I63.8: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareP91.82, S06

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of I63.8(2 notes)

    Coding workflow: The conditions named in this note are not included in I63.8. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareZ86.73, I69.3

    See the official tabular notes · Guidelines I.A.12.b

  • Use Additional Code — after identifying I63.8(10 notes)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with I63.8 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewZ92.82, R29.7, F10, Z77.22, Z87.891, Z57.31

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition I63.8 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewP91.82, S06

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with I63.8?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

ReviewZ92.82, R29.7, F10, Z77.22, Z87.891, Z57.31

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Other cerebral infarction is a non-billable ICD-10-CM category code (I63.8). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. 10 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  2. 2 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  3. 2 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • Not billable as written — a more specific code is required: I63.81, I63.89.

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

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name I63.8 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 5 Excludes1 notes across 3 chapters: G31.84 — Mild cognitive impairment of uncertain or unknown etiology (via I63.-), I65 — Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction (via I63.-), I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction (via I63.-), I67 — Other cerebrovascular diseases (via I63.-), P91.82 — Neonatal cerebral infarction (via I63.-).

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

Referenced by 3 Excludes2 notes: I10 — Essential (primary) hypertension (via I63.-), I15 — Secondary hypertension (via I63.-), I74 — Arterial embolism and thrombosis (via I63.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 3 Code First instructions across 3 chapters: G46 — Vascular syndromes of brain in cerebrovascular diseases (via I63.-), R29.7 — National Institutes of Health Stroke Scale (NIHSS) score (via I63.-), Z92.82 — Status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (via I63.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 11 Code Also instructions across 3 chapters: D57.03 — Hb-SS disease with cerebral vascular involvement (via I63.-), D57.213 — Sickle-cell/Hb-C disease with cerebral vascular involvement (via I63.-), D57.413 — Sickle-cell thalassemia, unspecified, with cerebral vascular involvement (via I63.-), D57.433 — Sickle-cell thalassemia beta zero with cerebral vascular involvement (via I63.-), D57.453 — Sickle-cell thalassemia beta plus with cerebral vascular involvement (via I63.-), D57.813 — Other sickle-cell disorders with cerebral vascular involvement (via I63.-), D81.32 — Adenosine deaminase 2 deficiency (via I63.-), G43.6 — Persistent migraine aura with cerebral infarction (via I63.-), G96.81 — Intracranial hypotension (via I63.-), I16.1 — Hypertensive emergency (via I63.-), I67.850 — Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (via I63.-).

These codes suggest coding this condition alongside when both are present.

Clinical classification (AHRQ CCSR):CIR020 — Cerebral infarction (default).

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 category (Cerebral infarction).

I63.531 — Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery, I63.532 — Cerebral infarction due to unspecified occlusion or stenosis of left posterior cerebral artery, I63.533 — Cerebral infarction due to unspecified occlusion or stenosis of bilateral posterior cerebral arteries, I63.539 — Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery, I63.541 — Cerebral infarction due to unspecified occlusion or stenosis of right cerebellar artery, I63.542 — Cerebral infarction due to unspecified occlusion or stenosis of left cerebellar artery, I63.543 — Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries, I63.549 — Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebellar artery, I63.59 — Cerebral infarction due to unspecified occlusion or stenosis of other cerebral artery, I63.6 — Cerebral infarction due to cerebral venous thrombosis, nonpyogenic, I63.81 — Other cerebral infarction due to occlusion or stenosis of small artery, I63.89 — Other cerebral infarction, I63.9 — Cerebral infarction, unspecified, I97.810 — Intraoperative cerebrovascular infarction during cardiac surgery, I97.811 — Intraoperative cerebrovascular infarction during other surgery, I97.820 — Postprocedural cerebrovascular infarction following cardiac surgery, I97.821 — Postprocedural cerebrovascular infarction following other surgery, R29.700 — NIHSS score 0, R29.701 — NIHSS score 1, R29.702 — NIHSS score 2, +122 more

Contextual Map

Every relationship of I63.8 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 I63.8 with these 19 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

  • I10 — Essential (primary) hypertension[Excludes2](via I63.-): “essential (primary) hypertension involving vessels of brain (I60-I69)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I15 — Secondary hypertension[Excludes2](via I63.-): “secondary hypertension involving vessels of brain (I60-I69)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I74 — Arterial embolism and thrombosis[Excludes2](via I63.-): “basilar embolism and thrombosis (I63.0-I63.2, I65.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code First instructions

Referenced by Code Also instructions (11)

Clinical classification (CCSR)

Nearest codes (40)

Change history (2)

Common coding questions

Can I63.8 be billed directly?

No. I63.8 (Other cerebral infarction) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

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

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "I63.8 — Other cerebral infarction." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/i63.8-other-cerebral-infarction

Change history

  • FY2019 — October 1, 2018
    Became a non-billable header
    FY2019 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Other cerebral infarction

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I63.8 in its code family, with their registry titles.

View all codes in the I63 family