Medical retirement directly after promotion

Ive seen multiple answers on this and I'm hoping I can be fed the correct information here. I'm at 25 years of active service and will promote to CW3 in a few months. I was talking to my PCM today and there is a medication that can be prescribed for improving a condition I have. She told me that the moment they prescribe it to me they will have to start the "medical separation" process. I'm assuming my retirement would look like "xx months of CW2 AND xx months of CW3 pay" except I've seen multiple places that say it would be "36 months of CW3 pay". any clarity anyone can provide would be great. FYI...the new DOD AI tool is what ga e me the 36 months pay answer. Thanks for any help that can be provided.
 
Sorry, I'm seeing the answer on different threads. W3 rank on paper and last 36 months (W2) for pay purposes.
 
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