I67.5 — Moyamoya disease
I67.5 is a billable, specific ICD-10-CM code for moyamoya disease. It is valid for submission on a claim.
Risk adjustment
I67.5 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
I67.5 is named in 13 Medicare coverage policies — 13 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56551Billing and Coding: Visual Fields Testing
- A56612Billing and Coding: CT of the Head
- A56631Billing and Coding: Thoracic Aortography and Carotid, Vertebral, and Subclavian Angiography
- A56722Billing and Coding: Intraoperative Neurophysiological Testing
How I67.5 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 I67.5.
- Encephaloduroarteriomyosynangiosis(EDAMS)
- Moyamoya disease
- Nishimoto disease(-Takeuchi)
- Disease, diseased›moyamoya
- Disease, diseased›Nishimoto(-Takeuchi)
Related codes at this level
Codes that share I67. If I67.5 is not quite right, the correct code is usually one of these.
- I67.0Dissection of cerebral arteries, nonruptured
- I67.1Cerebral aneurysm, nonruptured
- I67.2Cerebral atherosclerosis
- I67.3Progressive vascular leukoencephalopathy
- I67.4Hypertensive encephalopathy
- I67.6Nonpyogenic thrombosis of intracranial venous system
- I67.7Cerebral arteritis, not elsewhere classified
- I67.8Other specified cerebrovascular diseases
- I67.9Cerebrovascular disease, unspecified
Questions about I67.5
- Is I67.5 a billable ICD-10-CM code?
- Yes. I67.5 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I67.5 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Cerebrovascular diseases (I60-I69).