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I66.9

Billable

Occlusion and stenosis of unspecified cerebral artery

Occlusion and stenosis of unspecified cerebral artery

Status

Billable / Specific

Block

I60-I69

Parent Code

I66

Coding Notes

Includes

Conditions included under this code

  • embolism of cerebral artery
  • narrowing of cerebral artery
  • obstruction (complete) (partial) of cerebral artery
  • thrombosis of cerebral artery

Excludes 1

Codes that cannot be used together with this code (mutual exclusion)

  • traumatic intracranial hemorrhage (S06.-)
  • Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)

Excludes 2

Conditions not included here, but the patient may have both

  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Use Additional Code

Additional codes that should follow this code

  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Also Known As / Clinical Terms

SNOMED CT

UMLS

Frequently Asked Questions

What is ICD-10 code I66.9?

ICD-10-CM code I66.9 represents "Occlusion and stenosis of unspecified cerebral artery". It is a billable/specific code that can be used on a claim.

Is I66.9 a billable code?

Yes, I66.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.

What chapter is I66.9 in?

I66.9 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).

What codes cannot be used with I66.9?

I66.9 has Excludes1 notes indicating codes that cannot be used together with it, including: traumatic intracranial hemorrhage (S06.-); Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5).

Are additional codes required with I66.9?

Yes, when using I66.9 you should also code: code to identify presence of:; alcohol abuse and dependence (F10.-); exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); hypertension (I10-I1A); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0).

What SNOMED CT codes does I66.9 map to?

I66.9 maps to 15 SNOMED CT concepts: 724427002, 75543006, 20059004, 71444005, 1204128009, and 10 more. SNOMED CT is a clinical terminology used in electronic health records.

What are the UMLS CUIs for I66.9?

I66.9 is linked to 1 UMLS Concept Unique Identifier: C0494612. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.

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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.