G46.5 — Pure motor lacunar syndrome
G46.5 is a billable, specific ICD-10-CM code for pure motor lacunar syndrome. It is valid for submission on a claim.
Risk adjustment
G46.5 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G46.5 is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52992Billing and Coding: Non-Invasive Cerebrovascular Arterial Studies
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
- A56695Billing and Coding: Implantable Infusion Pump
How G46.5 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G46.5.
- Syndrome›pure›motor lacunar
Related codes at this level
Codes that share G46. If G46.5 is not quite right, the correct code is usually one of these.
- G46.0Middle cerebral artery syndrome
- G46.1Anterior cerebral artery syndrome
- G46.2Posterior cerebral artery syndrome
- G46.3Brain stem stroke syndrome
- G46.4Cerebellar stroke syndrome
- G46.6Pure sensory lacunar syndrome
- G46.7Other lacunar syndromes
- G46.8Other vascular syndromes of brain in cerebrovascular diseases
Questions about G46.5
- Is G46.5 a billable ICD-10-CM code?
- Yes. G46.5 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G46.5 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Episodic and paroxysmal disorders (G40-G47).