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I63.323 ICD-10-CM Code: Cerebral infarction due to thrombosis of bilateral anterior cerebral arteries

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term · 2 Excludes1 · 2 Excludes2 · 10 use-additional codes
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 100

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Use additional codeReport with this code when documented
  • 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)
  • code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)

+6 more in Instructions

Excludes1Never report with this code
  • neonatal cerebral infarction (P91.82-)
  • traumatic intracranial hemorrhage (S06.-)
Excludes2Not included here; may be reported together
  • chronic, without residual deficits (sequelae) (Z86.73)
  • sequelae of cerebral infarction (I69.3-)
IncludesWhat this code covers
  • occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 023 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR (MDC 01)
  • MS-DRG 024 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITHOUT MCC (MDC 01)
  • MS-DRG 061 — ISCHEMIC STROKE, PRECEREBRAL OCCLUSION OR TRANSIENT ISCHEMIA WITH THROMBOLYTIC AGENT WITH MCC (MDC 01)
  • MS-DRG 062 — ISCHEMIC STROKE, PRECEREBRAL OCCLUSION OR TRANSIENT ISCHEMIA WITH THROMBOLYTIC AGENT WITH CC (MDC 01)
  • MS-DRG 063 — ISCHEMIC STROKE, PRECEREBRAL OCCLUSION OR TRANSIENT ISCHEMIA WITH THROMBOLYTIC AGENT WITHOUT CC/MCC (MDC 01)
  • MS-DRG 064 — INTRACRANIAL HEMORRHAGE OR CEREBRAL INFARCTION WITH MCC (MDC 01)
  • MS-DRG 065 — INTRACRANIAL HEMORRHAGE OR CEREBRAL INFARCTION WITH CC OR TPA IN 24 HOURS (MDC 01)
  • MS-DRG 066 — INTRACRANIAL HEMORRHAGE OR CEREBRAL INFARCTION WITHOUT CC/MCC (MDC 01)
  • MS-DRG 791 — PREMATURITY WITH MAJOR PROBLEMS (MDC 15)
  • MS-DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 249 — Ischemic or Unspecified Stroke

Other models: CMS-HCC V22 HCC 100

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for I63.323 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on I63.323 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 I63.323

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

Before you code I63.323

  1. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: bilateral). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    See the relationships section · Guide: Laterality coding →

  2. I63.323’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

    Guide: Combination codes →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with I63.323. 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 a condition named in I63.323’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

  2. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

Consider I63.323. 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).
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).
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.

Official instructions as workflow

  • Excludes1 — check before selecting I63.323(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with I63.323: 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 I63.323(2 notes)

    Coding workflow: The conditions named in this note are not included in I63.323. 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 I63.323(10 notes)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with I63.323 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 I63.323 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: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is I63.323 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

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.

Don’t confuse I63.323 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of I63.323 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • P91.82— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of neonatal cerebral infarction moves the case to P91.82; the two are not reported together unless documented as unrelated.

    Full comparison: I63.323 vs P91.82 →

  • S06— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of traumatic intracranial hemorrhage moves the case to S06; the two are not reported together unless documented as unrelated.

    Full comparison: I63.323 vs S06 →

  • I63.329— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Cerebral infarction due to thrombosis of unspecified anterior cerebral artery” takes I63.329; specificity in the record moves it back here.

    Full comparison: I63.323 vs I63.329 →

  • Z86.73— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of chronic, without residual deficits (sequelae) adds Z86.73; it is not part of this code and both may be reported when both are documented.

    Full comparison: I63.323 vs Z86.73 →

  • I69.3— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of sequelae of cerebral infarction adds I69.3; it is not part of this code and both may be reported when both are documented.

    Full comparison: I63.323 vs I69.3 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Cerebral infarction due to thrombosis of bilateral anterior cerebral arteries is a billable ICD-10-CM diagnosis code (I63.323).

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

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 18: Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

i. NIHSS Stroke Scale The NIH stroke scale (NIHSS) codes (R29.7- -) can be used in conjunction with acute stroke codes (I60-I63) to identify the patient's neurological status and the severity of the stroke. The stroke scale codes should be sequenced after the acute stroke diagnosis code(s).

Decision Points

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

  1. Laterality is coded in this family. Confirm the documented side matches the code — the opposite-side siblings are in the relationships section. See the opposite-side sibling codes
  2. 10 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  3. 2 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  4. 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

  • MCC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

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-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name I63.323 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.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: MCC — Major Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 84 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 10 MS-DRGs: DRG 023 (MDC 01), DRG 024 (MDC 01), DRG 061 (MDC 01), DRG 062 (MDC 01), DRG 063 (MDC 01), DRG 064 (MDC 01), DRG 065 (MDC 01), DRG 066 (MDC 01), DRG 791 (MDC 15), DRG 793 (MDC 15).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

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 process (MS-DRG)

Acts as MCC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

I27.841 — Fontan-associated lymphatic dysfunction, I27.848 — Other Fontan-associated condition, I27.849 — Fontan related circulation, unspecified, I63.30 — Cerebral infarction due to thrombosis of unspecified cerebral artery, I63.311 — Cerebral infarction due to thrombosis of right middle cerebral artery, I63.312 — Cerebral infarction due to thrombosis of left middle cerebral artery, I63.313 — Cerebral infarction due to thrombosis of bilateral middle cerebral arteries, I63.319 — Cerebral infarction due to thrombosis of unspecified middle cerebral artery, I63.321 — Cerebral infarction due to thrombosis of right anterior cerebral artery, I63.322 — Cerebral infarction due to thrombosis of left anterior cerebral artery, I63.329 — Cerebral infarction due to thrombosis of unspecified anterior cerebral artery, I63.331 — Cerebral infarction due to thrombosis of right posterior cerebral artery, I63.332 — Cerebral infarction due to thrombosis of left posterior cerebral artery, I63.333 — Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries, I63.339 — Cerebral infarction due to thrombosis of unspecified posterior cerebral artery, I63.341 — Cerebral infarction due to thrombosis of right cerebellar artery, I63.342 — Cerebral infarction due to thrombosis of left cerebellar artery, I63.343 — Cerebral infarction due to thrombosis of bilateral cerebellar arteries, I63.349 — Cerebral infarction due to thrombosis of unspecified cerebellar artery, I63.39 — Cerebral infarction due to thrombosis of other cerebral artery, +63 more

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Ischemic or Unspecified Stroke) for risk-adjusted payment.

I63.233 — Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries, I63.239 — Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid artery, I63.29 — Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteries, I63.30 — Cerebral infarction due to thrombosis of unspecified cerebral artery, I63.311 — Cerebral infarction due to thrombosis of right middle cerebral artery, I63.312 — Cerebral infarction due to thrombosis of left middle cerebral artery, I63.313 — Cerebral infarction due to thrombosis of bilateral middle cerebral arteries, I63.319 — Cerebral infarction due to thrombosis of unspecified middle cerebral artery, I63.321 — Cerebral infarction due to thrombosis of right anterior cerebral artery, I63.322 — Cerebral infarction due to thrombosis of left anterior cerebral artery, I63.329 — Cerebral infarction due to thrombosis of unspecified anterior cerebral artery, I63.331 — Cerebral infarction due to thrombosis of right posterior cerebral artery, I63.332 — Cerebral infarction due to thrombosis of left posterior cerebral artery, I63.333 — Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries, I63.339 — Cerebral infarction due to thrombosis of unspecified posterior cerebral artery, I63.341 — Cerebral infarction due to thrombosis of right cerebellar artery, I63.342 — Cerebral infarction due to thrombosis of left cerebellar artery, I63.343 — Cerebral infarction due to thrombosis of bilateral cerebellar arteries, I63.349 — Cerebral infarction due to thrombosis of unspecified cerebellar artery, I63.39 — Cerebral infarction due to thrombosis of other cerebral artery, +74 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Intracranial Hemorrhage

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Cerebral infarction).

I63.233 — Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries, I63.239 — Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid artery, I63.29 — Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteries, I63.30 — Cerebral infarction due to thrombosis of unspecified cerebral artery, I63.311 — Cerebral infarction due to thrombosis of right middle cerebral artery, I63.312 — Cerebral infarction due to thrombosis of left middle cerebral artery, I63.313 — Cerebral infarction due to thrombosis of bilateral middle cerebral arteries, I63.319 — Cerebral infarction due to thrombosis of unspecified middle cerebral artery, I63.321 — Cerebral infarction due to thrombosis of right anterior cerebral artery, I63.322 — Cerebral infarction due to thrombosis of left anterior cerebral artery, I63.329 — Cerebral infarction due to thrombosis of unspecified anterior cerebral artery, I63.331 — Cerebral infarction due to thrombosis of right posterior cerebral artery, I63.332 — Cerebral infarction due to thrombosis of left posterior cerebral artery, I63.333 — Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries, I63.339 — Cerebral infarction due to thrombosis of unspecified posterior cerebral artery, I63.341 — Cerebral infarction due to thrombosis of right cerebellar artery, I63.342 — Cerebral infarction due to thrombosis of left cerebellar artery, I63.343 — Cerebral infarction due to thrombosis of bilateral cerebellar arteries, I63.349 — Cerebral infarction due to thrombosis of unspecified cerebellar artery, I63.39 — Cerebral infarction due to thrombosis of other cerebral artery, +122 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Occlusion, occluded”, “Thrombosis, thrombotic”, “Monoplegia”, …; these codes share that main term but sit in a different category of the Tabular List.

I22.2 — Subsequent non-ST elevation (NSTEMI) myocardial infarction (myocardium, myocardial, subsequent, subendocardial), I22.8 — Subsequent ST elevation (STEMI) myocardial infarction of other sites (myocardium, myocardial, subsequent, septal), I22.9 — Subsequent ST elevation (STEMI) myocardial infarction of unspecified site (myocardium, myocardial, subsequent), I23.6 — Thrombosis of atrium, auricular appendage, and ventricle as current complications following acute myocardial infarction (ventricle, following acute myocardial infarction), I24.0 — Acute coronary thrombosis not resulting in myocardial infarction (artery, coronary), I25.2 — Old myocardial infarction (coronary, healed or old), I25.82 — Chronic total occlusion of coronary artery (coronary, total), I34.89 — Other nonrheumatic mitral valve disorders (mitral), I50.9 — Heart failure, unspecified (cardiac), I51.3 — Intracardiac thrombosis, not elsewhere classified (mural, old), I65.0 — Occlusion and stenosis of vertebral artery (artery, vertebral), I65.1 — Occlusion and stenosis of basilar artery (artery, basilar), I65.2 — Occlusion and stenosis of carotid artery (artery, carotid), I65.8 — Occlusion and stenosis of other precerebral arteries (artery, auditory, internal), I65.9 — Occlusion and stenosis of unspecified precerebral artery (artery, precerebral), I66.0 — Occlusion and stenosis of middle cerebral artery (artery, cerebral, middle), I66.1 — Occlusion and stenosis of anterior cerebral artery (artery, cerebral, anterior), I66.2 — Occlusion and stenosis of posterior cerebral artery (artery, cerebral, posterior), I66.3 — Occlusion and stenosis of cerebellar arteries (artery, cerebellar), I66.8 — Occlusion and stenosis of other cerebral arteries (meninges), +325 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Lipid Panel, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of I63.323 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 I63.323 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-fy2027
  • I15 — Secondary hypertension[Excludes2](via I63.-): “secondary hypertension involving vessels of brain (I60-I69)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • 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-fy2027

Referenced by Code First instructions

Referenced by Code Also instructions (11)

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 249 — Ischemic or Unspecified Stroke [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper (10)

MDC crossing

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Nearest codes (40)

Change history (3)

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

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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. "I63.323 — Cerebral infarction due to thrombosis of bilateral anterior cerebral arteries." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/i63.323-cerebral-infarction-due-to-thrombosis-of-bilateral-anterior-cerebral-arteries

Change history

  • FY2018 — October 1, 2017
    Description revised
    Cerebral infarction due to thrombosis of bilateral anterior arteries → Cerebral infarction due to thrombosis of bilateral anterior cerebral arteries
    FY2018 changes
  • FY2018 — October 1, 2017
    Short description revised
    Cerebral infrc due to thombos of bilateral anterior arteries → Cerebral infrc due to thombos of bi ant cerebral arteries
    FY2018 changes
  • FY2017 — October 1, 2016
    Added to the code set
    Cerebral infarction due to thrombosis of bilateral anterior arteries
    FY2017 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I63.323 in its code family, with their registry titles.

View all codes in the I63 family