Two codes are necessary to identify the condition. First assign the code from subcategory 362.11, Hypertensive retinopathy, then the appropriate code from categories 401-405 to indicate the type of hypertension.
See ICD-9-CM Official Guidelines for Coding and Reporting Effective October 1, 2010 http://www.cdc.gov/nchs/data/icd9/icdguide10.pdf
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