If you are medically retired before 20 years, do you have to pay back your REDUX bonus?

I found this

IF A MEMBER FAILS TO SERVE CONTINUOUSLY ON ACTIVE DUTY UNTIL
HIS 20TH ANNIVERSARY, THE LAW STIPULATES THAT A PROPORTIONATE SHARE OF THE CSB MUST BE REPAID. SECDEF HAS WAIVED BONUS REPAYMENT IF A MEMBER DIES ON ACTIVE DUTY, IS SEPARATED OR RETIRED AS A RESULT OF A PHYSICAL DISABILITY UNDER CHAPTER 61 OF TITLE 10 U.S. CODE, OR
SEPARATED UNDER A SERVICE OFFER FOR EARLY RETIREMENT (SUCH AS TERA)
OR SEPARATION PROGRAM. THIS WAIVER IS NOT AVAILABLE IF A MEMBER IS
SEPARATED DUE TO MISCONDUCT OR IF THE WAIVER WOULD BE INCONSISTENT
WITH OTHER PRESCRIBED LAW, REGULATION, OR POLICY

SSgt Gregory Guina is correct. Also includes force-shaping retirements like TERA.

IAW DoD Financial Management Regulation
DOD 7000.14-R, VOLUME 7A, CHAPTER 66
“CAREER STATUS BONUS/REDUX ELECTION OPTION”

Waiver of Career Status Bonus (CSB) Recoupment. The Secretary of the Military Department concerned may waive, in whole or in part, the required CSB refund if the Secretary determines that recovery would be against equity and good conscience or contrary to the best interests of the United States.

A. The Secretary of the Military Department shall waive the required refund
if the member:

1. Dies, or

2. Is separated or retired as a result of a physical disability under 10 U.S.C., Chapter 61, or

3. Is separated under a Service offer for early retirement (such as
TERA (Temporary Early Retirement Authority)) or separation program.

Here's the link:
http://comptroller.defense.gov/Portals/45/documents/fmr/archive/07aarch/07a_66_May05.pdf

Here is the best info I could find:
"Suppose a soldier elects CSB/REDUX and accepts the $30,000 CSB but
later retires for disability. Which formula will be used to calculate the
soldier’s retired pay? If High-3, will the soldier have to pay back the CSB?
Will this soldier receive COLAs based on the High-3 or CSB/REDUX retired
pay formula?
The High-3 formula would be used. The soldier would not have
to pay back the $30,000 CSB. Because this soldier originally elected REDUX, the
soldier will receive the reduced CSB/REDUX COLAs even though the disability
retired pay will be calculated under the High-3 formula. "

Extracted from:

http://www.garrison.hawaii.army.mil/dhr/rso/CAREER%20STATUS%20BONUS%20(CSB%20REDUX)/10%20CSB%20REDUX%20FAQS.pdf