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CPT® Assistant is the official word from the AMA on proper CPT® code usage. AAPC Coder's Code Connect add-on allows you to search all CPT® Assistant articles from 1990 to present by CPT® code to narrow the options to only related articles for quick coding guidance.

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The HCPCS Coding Clinic delivers the official guidance published quarterly by the American Hospital Association (AHA) Central Office on correct HCPCS level II code usage. Each issue offers consistent and accurate advice for the proper use of HCPCS and includes information on HCPCS reporting for hospitals HCPCS Level 1 (CPT®) and Level II codes, the latest code assignments from emerging technologies, and real examples.

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Occlusion and stenosis of unspecified precerebral artery without cerebral infarction (433.90)

ICD-9 code 433.90 for Occlusion and stenosis of unspecified precerebral artery without cerebral infarction is a medical classification as listed by WHO under the range -CEREBROVASCULAR DISEASE (430-438).

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Coding
Code Descriptor and Instructional Notes
Occlusion and stenosis of unspecified precerebral artery without cerebral infarction

[0-1]

Precerebral artery NOS

The following fifth-digit subclassification is for use with category 433:

0 without mention of cerebral infarction

1 with cerebral infarction

Includes: embolism of basilar, carotid, and vertebral arteries

narrowing of basilar, carotid, and vertebral arteries

obstruction of basilar, carotid, and vertebral arteries

thrombosis of basilar, carotid, and vertebral arteries

Excludes: insufficiency NOS of precerebral arteries (435.0-435.9)

Use additional code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (V45.88)

ICD-9-CM Subcategories/Subclassifications
Category Notes
Chapter Specific Coding Guidelines
CC Exclusion List
Articles
Claims Edits
CPT
ICD-10-CM
Compliance
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