ICD 10 Meniscus Tears

I'm trying to figure out which ICD-10 for chronic. Tear, old, directs me to see Derangement, knee, meniscus, due to old tear. I'm confused between "due to old tear or injury" and "specified NEC". The situation I have is we do not have a date of injury; pain going on for 3 yrs. We send out for an MRI. The MRI comes back as tear. M23.30_ or M23.20_?
Thank you,
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