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I69.854

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🧬 ICD-10 CM I69.854 — Hemiplegia and hemiparesis following other cerebrovascular disease affecting left non-dominant side

Billable Code Confirmed

ICD-10 CM I69.854 is a valid, billable 7-character ICD-10-CM code for FY2026. All characters are present. No further specificity is required.

"Other" vs. "Unspecified" Cerebrovascular Disease

Subcategory I69.8- is explicitly reserved for sequelae of other specified cerebrovascular diseases. This implies the physician knows the exact etiology (e.g., cerebral arteritis, Moyamoya disease, nonpyogenic cerebral venous thrombosis) and it falls into the I67.- or I68.- categories, rather than standard ischemic or hemorrhagic strokes. If the record merely states “stroke” or “CVA” without further detail, you must use the “unspecified” subcategory (I69.954).

Default Dominance Rule (Left Side)

Per ICD-10-CM Official Coding Guidelines, if a patient presents with left-sided hemiplegia or hemiparesis and the medical record does not specify their handedness or dominance, the default rule requires assigning the non-dominant code. Therefore, I69.854 is the correct code for left-sided deficits in an ambidextrous patient, a documented right-handed patient, or a patient whose handedness is entirely undocumented.

🔍 Code Description

ICD-10 CM I69.854 classifies the late effects (sequelae) of a specified “other” cerebrovascular disease that have resulted in hemiplegia (complete paralysis) or hemiparesis (weakness) on the left, non-dominant side of the body.

A condition is considered a sequela if it remains after the acute phase of the illness has ended. There is no time limit for assigning a sequela code; it can be used for the rest of the patient’s life to describe the residual deficit.

🌳 Code Tree / Hierarchy

I69 Sequelae of cerebrovascular disease
 │
 └── I69.8 Sequelae of other cerebrovascular diseases ❌ Non-billable
      │
      └── I69.85 Hemiplegia and hemiparesis following other cerebrovascular disease ❌ Non-billable
           ├── I69.851 Right dominant side ✅ Billable
           ├── I69.852 Left dominant side ✅ Billable
           ├── I69.853 Right non-dominant side ✅ Billable
           ├── I69.854 LEFT NON-DOMINANT SIDE ◀ THIS CODE ✅ Billable
           └── I69.859 Unspecified side ⚠️ Avoid

✅ Includes

The following clinical terms and scenarios map to I69.854:

  • Left-sided weakness (non-dominant) due to old cerebral venous thrombosis.

  • Left-sided paralysis (non-dominant) secondary to a prior episode of cerebral arteritis.

  • Spastic hemiplegia of the left non-dominant side as a late effect of Moyamoya disease.

  • Residual left arm/leg weakness from a known cerebrovascular anomaly not classified as I60-I63.

❌ Excludes

Excludes 1 — Cannot Be Coded Simultaneously

CodeDescriptionNote
I67.9Cerebrovascular disease, unspecifiedMutually exclusive. Do not code the acute/active disease concurrently with the sequela code for the same event.
G81.94 1Hemiplegia, unspecified affecting left non-dominant sideCategory G81 is excluded when the hemiplegia is explicitly documented as a sequela of cerebrovascular disease. The I69 combination code fully captures both.
I69.954Hemiplegia/hemiparesis following unspecified cerebrovascular diseaseDo not use the “unspecified” sequela code if the medical record indicates the original event was a specifically identified “other” condition (like Moyamoya).
I69.354Hemiplegia/hemiparesis following cerebral infarctionDifferentiate “other” pathologies from classic ischemic infarctions (I63.-).

📋 Clinical Overview

Pathophysiology

“Other” cerebrovascular diseases comprise a heterogeneous group of conditions that alter cerebral blood flow without necessarily resulting from classic atherosclerosis/embolism (I63) or aneurysmal rupture (I60). Examples include cerebral arteritis (inflammation of blood vessels), Moyamoya disease (progressive stenosis of intracranial internal carotid arteries with collateral network formation), and cerebral venous sinus thrombosis. When these conditions cause ischemia or localized injury to the right hemisphere’s motor cortex or corticospinal tracts, they result in contralateral (left-sided) motor deficits.

Clinical Presentation

Patients coded with I69.854 typically present with:

  • Chronic unilateral motor impairment of the left face, arm, and/or leg.

  • Features of upper motor neuron injury: spasticity, hyperreflexia, and a positive Babinski sign.

  • A documented medical history explicitly naming an atypical cerebrovascular etiology (e.g., “patient with left hemiparesis secondary to cerebral venous thrombosis 4 years ago”).

💰 HCC Risk Adjustment (CMS-HCC v28)

FieldDetail
CMS-HCC Model Versionv28 (2024-2026 Implementation)
HCC AssignmentHCC 193
HCC CategoryParaplegia and Hemiplegia
RAF CoefficientSubject to demographic variables

🛠️ CPT & Procedural Crosswalk

While I69.854 is a diagnosis code, it justifies the medical necessity for evaluation, management, and rehabilitative services.

CPT CodeDescriptionClinical Application
97110Therapeutic procedure, 1 or more areas, each 15 minutesPhysical therapy for gait training and left-sided strengthening.
97530Therapeutic activities, direct patient contactOccupational therapy to improve ADL performance using the paretic left arm.
99214E/M established patient, moderate complexityRoutine neurology, PM&R, or primary care follow-up for stroke sequelae.
64640Destruction by neurolytic agent; other peripheral nerveChemodenervation (Botox) injections for left-sided spasticity.

💊 Coding Scenarios and Examples

Scenario 1 — Outpatient PM&R Follow-Up for Moyamoya Sequelae

Clinical Vignette: A 42-year-old right-handed female presents to the neuro-rehabilitation clinic. She has a known history of Moyamoya disease, which caused a severe ischemic neurological event 5 years ago. She has persistent left-sided hemiparesis and is currently here for evaluation of her left upper extremity spasticity.

ICD-10-CM:

  • I69.854 — Hemiplegia and hemiparesis following other cerebrovascular disease, left non-dominant side (Accurately links the specified “other” etiology [Moyamoya] with the residual left-sided deficit in a right-handed patient).

  • I67.5 — Moyamoya disease (Can be coded concurrently if the Moyamoya disease is still an active, ongoing condition being managed, alongside the sequela of the past acute injury).

Scenario 2 — Post-Cerebral Venous Thrombosis Hemiplegia

Clinical Vignette: A 55-year-old male is admitted to a skilled nursing facility. His chart indicates “Left-sided hemiplegia secondary to an extensive nonpyogenic cerebral venous thrombosis 2 years ago.” Handedness is not documented.

ICD-10-CM:

  • I69.854 — Hemiplegia and hemiparesis following other cerebrovascular disease, left non-dominant side (Cerebral venous thrombosis is an “other” cerebrovascular disease [I67.6]. Since handedness is undocumented, left-sided deficits default to non-dominant).

⚠️ Coding Pitfalls and Tips

Pitfall or Tip
❌Do not confuse “Other” with “Unspecified”. If the chart only says “CVA” or “Stroke” with no specific etiology, use I69.954. Reserve I69.854 for when a specific, non-standard cerebrovascular pathology is documented.
❌Do not assign G81.- (Hemiplegia) with I69.854. The I69 code is a combination code that already incorporates the hemiplegic deficit. Assigning both is redundant and triggers edits.
✅Rely on the Default Dominance Rule. If the medical record explicitly states left hemiplegia due to an “other” CVD but never mentions if the patient is right- or left-handed, you must assign the non-dominant code (I69.854) per ICD-10 guidelines.
✅Code all additional sequelae. A patient can have multiple sequelae from the same event. If they also suffer from ataxia as a result of the same pathology, code I69.893 alongside the hemiplegia code.

📚 Sources

CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting. Section I.C.9.d: Cerebrovascular Disease; Sequelae of Cerebrovascular Disease; Default Dominance/Handedness logic.

AAPC & ICD10Data. ICD-10-CM Tabular List of Diseases and Injuries. I69.8 Category instructions.

Ropper AH, Samuels MA, Klein JP. Adams and Victor’s Principles of Neurology. “Other” cerebrovascular diseases, including Moyamoya, arteritis, and venous thrombosis pathophysiology.

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