DEFINITION of hemiplegia
Hemiplegia is the complete and total loss of voluntary movement on one side of the body, representing the most severe end of the unilateral motor deficit spectrum. It results from an interruption of the corticospinal (pyramidal) tract at any point from the motor cortex through the internal capsule, brainstem, or spinal cord, with weakness occurring contralateral to the lesion above the decussation of the medullary pyramids. In the acute phase, hemiplegia typically presents as flaccid (hypotonia, areflexia, loss of all movement) due to spinal shock. Over days to weeks, it evolves into spastic hemiplegia (hypertonia, hyperreflexia, clasp-knife rigidity, Babinski sign, clonus) as upper motor neuron release phenomena emerge. It differs from hemiparesis only in degree — hemiplegia = zero voluntary movement; hemiparesis = some voluntary movement preserved. stroke is the most common cause, but hemiplegia also results from traumatic brain injury, brain tumors, cerebral palsy (a leading cause in children), demyelinating disease, and CNS infections. In ICD-10-CM, hemiplegia and hemiparesis are deliberately classified together under the same codes (G81.xx, I69.x5x), recognizing the clinical continuum between them.
ETYMOLOGY of hemiplegia
Component Origin Meaning hemi- Greek hēmi- (ἡμι-) Half -plegia Greek plēgē (πληγή), from plēssein A blow, stroke, or strike; complete paralysis Literally: “a striking of half [the body]” — evoking the sudden, blow-like onset of complete one-sided paralysis, as in stroke. The Greek plēgē is also the root of the word “apoplexy,” the historical term for stroke.
Key distinction from hemiparesis: -plegia (complete paralysis) vs. -paresis (partial weakness). The same -plegia root appears in paraplegia, quadriplegia, diplegia, and monoplegia.
- Hemiparalysis — older synonym; rarely used in modern clinical documentation
- Flaccid hemiplegia — acute phase; LMN-pattern (hypotonia, areflexia); spinal shock state
- Spastic hemiplegia — chronic/recovery phase; UMN-pattern (hypertonia, hyperreflexia, Babinski)
- Cerebral hemiplegia — emphasizing brain origin (vs. spinal)
- Infantile hemiplegia — hemiplegia from perinatal brain injury; a subtype of cerebral palsy
- Alternate hemiplegia (crossed hemiplegia) — ipsilateral cranial nerve palsy + contralateral body weakness; classic brainstem lesion pattern
- Alternating hemiplegia of childhood (AHC) — rare genetic disorder (ATP1A3 mutation) causing recurrent episodic hemiplegia
- Post-ictal hemiplegia (Todd’s paralysis) — transient complete weakness after focal seizure; may mimic stroke
- Hemiplegic migraine — rare migraine variant with transient hemiplegia as aura
- Brachiofacial hemiplegia — arm and face predominantly affected; cortical/MCA distribution
- Crural hemiplegia — leg predominantly affected; ACA distribution
- Hemiparesis — the partial/incomplete version; same ICD-10 code family
- Monoplegia — complete paralysis of one limb (ICD-10: G83.0x-G83.2x)
- Paraplegia — bilateral lower limb paralysis (ICD-10: G82.2x)
- quadriplegia / tetraplegia — all four limbs (ICD-10: G82.5x)
- diplegia — bilateral symmetric involvement, typically cerebral palsy
- Corticospinal tract — the motor pathway; interruption = hemiplegia
- Internal capsule — dense white matter tract; small lesion here causes complete hemiplegia
- Decussation of the pyramids — where motor fibers cross; determines contralateral pattern
- Upper motor neuron (UMN) — spasticity, hyperreflexia, Babinski, clonus
- Lower motor neuron (LMN) — flaccidity, atrophy, fasciculations, areflexia
- Cerebral palsy (CP) — leading cause of hemiplegia in children
- Locked-in syndrome — bilateral corticospinal tract lesion (pons); complete paralysis except eye movements; distinct from hemiplegia
- Glasgow Coma Scale (GCS) — motor response component assesses hemiplegia severity acutely
- NIHSS (NIH Stroke Scale) — motor arm/leg items quantify hemiplegic severity
- Brunnstrom stages — motor recovery stages post-stroke hemiplegia (I-VI)
- Fugl-Meyer Assessment — quantitative motor recovery scale
- Constraint-induced movement therapy (CIMT) — intensive upper extremity rehabilitation
- Ankle-foot orthosis (AFO) — common assistive device for hemiplegic gait (foot drop)
- Spasticity — major complication of chronic hemiplegia; treated with baclofen, botulinum toxin
### 🏥 ICD-10-CM CODESCritical Note: ICD-10-CM category G81 is titled “Hemiplegia and hemiparesis” — both conditions share every code in this category. The documentation of hemiplegia vs. hemiparesis does not change the code; both map to the same codes. The 4th character specifies type (flaccid, spastic, unspecified) and the 5th character specifies side and dominance.
Hemiplegia/Hemiparesis — Non-Cerebrovascular (Category G81)
(Use when NOT a sequela of a cerebrovascular event — e.g., cerebral palsy, TBI, tumor, MS)
Flaccid Hemiplegia (G81.0x):
Code Description G81.00 Flaccid hemiplegia affecting unspecified side G81.01 Flaccid hemiplegia affecting right dominant side G81.02 Flaccid hemiplegia affecting left dominant side G81.03 Flaccid hemiplegia affecting right nondominant side G81.04 Flaccid hemiplegia affecting left nondominant side Spastic Hemiplegia (G81.1x):
Code Description G81.10 Spastic hemiplegia affecting unspecified side G81.11 Spastic hemiplegia affecting right dominant side G81.12 Spastic hemiplegia affecting left dominant side G81.13 Spastic hemiplegia affecting right nondominant side G81.14 Spastic hemiplegia affecting left nondominant side Hemiplegia, Unspecified (G81.9x):
Code Description G81.90 Hemiplegia, unspecified affecting unspecified side G81.91 Hemiplegia, unspecified affecting right dominant side G81.92 Hemiplegia, unspecified affecting left dominant side G81.93 Hemiplegia, unspecified affecting right nondominant side G81.94 1 Hemiplegia, unspecified affecting left nondominant side
Hemiplegia/Hemiparesis as Sequela of Cerebrovascular Disease (Category I69)
(Use when documented as a sequela/late effect of a specific cerebrovascular event)
Following Cerebral Infarction (I69.35x):
Code Description I69.351 Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side I69.352 Hemiplegia and hemiparesis following cerebral infarction affecting left dominant side I69.353 Hemiplegia and hemiparesis following cerebral infarction affecting right non-dominant side I69.354 Hemiplegia and hemiparesis following cerebral infarction affecting left non-dominant side I69.359 Hemiplegia and hemiparesis following cerebral infarction affecting unspecified side Following Nontraumatic Subarachnoid Hemorrhage (I69.05x):
Code Description I69.051 Hemiplegia and hemiparesis following nontraumatic subarachnoid hemorrhage affecting right dominant side I69.052 Hemiplegia and hemiparesis following nontraumatic subarachnoid hemorrhage affecting left dominant side I69.053 Hemiplegia and hemiparesis following nontraumatic subarachnoid hemorrhage affecting right non-dominant side I69.054 Hemiplegia and hemiparesis following nontraumatic subarachnoid hemorrhage affecting left non-dominant side I69.059 Hemiplegia and hemiparesis following nontraumatic subarachnoid hemorrhage affecting unspecified side Following Nontraumatic Intracerebral Hemorrhage (I69.15x):
Code Description I69.151 Hemiplegia and hemiparesis following nontraumatic intracerebral hemorrhage affecting right dominant side I69.152 Hemiplegia and hemiparesis following nontraumatic intracerebral hemorrhage affecting left dominant side I69.153 Hemiplegia and hemiparesis following nontraumatic intracerebral hemorrhage affecting right non-dominant side I69.154 Hemiplegia and hemiparesis following nontraumatic intracerebral hemorrhage affecting left non-dominant side I69.159 Hemiplegia and hemiparesis following nontraumatic intracerebral hemorrhage affecting unspecified side Following Other Nontraumatic Intracranial Hemorrhage (I69.25x):
Code Description I69.251 Hemiplegia and hemiparesis following other nontraumatic intracranial hemorrhage affecting right dominant side I69.252 Hemiplegia and hemiparesis following other nontraumatic intracranial hemorrhage affecting left dominant side I69.253 Hemiplegia and hemiparesis following other nontraumatic intracranial hemorrhage affecting right non-dominant side I69.254 Hemiplegia and hemiparesis following other nontraumatic intracranial hemorrhage affecting left non-dominant side I69.259 Hemiplegia and hemiparesis following other nontraumatic intracranial hemorrhage affecting unspecified side Following Other / Unspecified Cerebrovascular Disease:
Code Description I69.851 Hemiplegia and hemiparesis following other cerebrovascular disease affecting right dominant side I69.852 Hemiplegia and hemiparesis following other cerebrovascular disease affecting left dominant side I69.853 Hemiplegia and hemiparesis following other cerebrovascular disease affecting right non-dominant side I69.854 Hemiplegia and hemiparesis following other cerebrovascular disease affecting left non-dominant side I69.951 Hemiplegia and hemiparesis following unspecified cerebrovascular disease affecting right dominant side I69.952 Hemiplegia and hemiparesis following unspecified cerebrovascular disease affecting left dominant side I69.953 Hemiplegia and hemiparesis following unspecified cerebrovascular disease affecting right non-dominant side I69.954 Hemiplegia and hemiparesis following unspecified cerebrovascular disease affecting left non-dominant side I69.959 Hemiplegia and hemiparesis following unspecified cerebrovascular disease affecting unspecified side
🔧 COMMON CPT CODES
Neurological Evaluation & Management
CPT Code Description 99223 Initial hospital inpatient E&M, high complexity 99233 Subsequent hospital inpatient E&M, high complexity 99232 Subsequent hospital inpatient E&M, moderate complexity Neuroimaging
CPT Code Description 70553 MRI brain with and without contrast 70551 MRI brain without contrast 70544 MRA brain without contrast 70496 CT angiography, head 70450 CT head without contrast (acute stroke workup) Physical Medicine & Rehabilitation
CPT Code Description 97110 Therapeutic exercises (15 min) 97112 Neuromuscular reeducation (15 min) 97530 Therapeutic activities (15 min) 97535 Self-care/home management training (15 min) 97165 Occupational therapy evaluation, low complexity 97166 Occupational therapy evaluation, moderate complexity 97167 Occupational therapy evaluation, high complexity 97750 Physical performance test or measurement Spasticity Management
CPT Code Description 64644 Chemodenervation of muscle(s); upper/lower extremity(ies), 1-4 muscles 64645 Chemodenervation of muscle(s); trunk muscle(s) 64646 Chemodenervation of muscle(s); upper/lower extremity(ies), 5 or more muscles 62350 Implantation of intrathecal catheter for drug infusion (baclofen pump) 62362 Implantation/replacement of device for intrathecal drug infusion; programmable pump Electrophysiology
CPT Code Description 95886 Needle EMG, complete study of extremity (5 or more muscles) 95910 Nerve conduction studies; 7-8 studies 95925 Short-latency somatosensory evoked potential (SSEP); upper limbs 95926 Short-latency somatosensory evoked potential (SSEP); lower limbs
🏷️ RELEVANT CPT MODIFIERS
Modifier Description -RT Right side -LT Left side -52 Reduced services -59 Distinct procedural service -GP Services under outpatient physical therapy plan of care -GO Services under outpatient occupational therapy plan of care -GN Services under outpatient speech-language pathology plan of care -KX Medical necessity requirements met; therapy cap exception (Medicare) -GZ Item/service expected to be denied — not reasonable and necessary -96 Habilitative services -97 Rehabilitative services
⚠️ Coding Note: The single most important distinction for inpatient coders: G81.xx is used when hemiplegia is NOT a sequela of cerebrovascular disease (e.g., cerebral palsy, TBI, tumor, MS, Todd’s paralysis). When it IS a documented sequela of stroke or intracranial hemorrhage, use the I69.X5X codes exclusively — do not code both G81 and I69.x5x for the same condition. The I69.X5X codes are CC (Complication/Comorbidity) under MS-DRG and significantly impact DRG weight. The flaccid vs. spastic distinction in G81 matters for specificity — flaccid (G81.0x) reflects the acute/LMN phase while spastic (G81.1x) reflects the chronic/UMN recovery phase; query the physician when this is not specified. As always, document and code laterality and dominance to the highest specificity possible — unspecified codes (ending in 0 or 9) should be used only as a last resort.
DERIVATIONS of hemiplegia
TABLE definition AS Definition FROM #medterm WHERE length(filter(roots, (word) => econtains([[]].roots, word))) > 0 AND file.name != [[]].file.name SORT file.name ASC
Query functionality
TABLE definition AS Definition FROM #medterm WHERE length(filter(definition, (word) => econtains([[]].definition, word))) > 0 AND file.name != [[]].file.name
Med roots dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms