ICD-10-CM 2027
ICD-10 code for Nishimoto disease
From the official ICD-10-CM alphabetic index entry “Nishimoto (-Takeuchi) disease”. Page updated September 29, 2026.
About coding Nishimoto disease
The ICD-10-CM code for Nishimoto disease is I67.5 (Moyamoya disease).
Within I67 (other cerebrovascular diseases), I67.5 is specifically for Moyamoya disease. Related codes cover dissection of cerebral arteries, nonruptured (I67.0), cerebral aneurysm, nonruptured (I67.1), cerebral atherosclerosis (I67.2), progressive vascular leukoencephalopathy (I67.3), hypertensive encephalopathy (I67.4), nonpyogenic thrombosis of intracranial venous system (I67.6), cerebral arteritis, not elsewhere classified (I67.7), other specified cerebrovascular diseases (I67.8) and 1 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Nishimoto disease ICD-10 codes
What is the ICD-10 code for Nishimoto disease?
- I67.5 — Moyamoya disease.
Is I67.5 billable?
- Yes. I67.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I67.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I67.5 as a principal diagnosis.
Is I67.5 a CC or MCC?
- I67.5 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.