NCCI edits for A9521
Code page: https://localishealth.com/hcpcs/A9521
NCCI release: 2026 C
Source: https://www.cms.gov/medicare/coding-billing/national-correct-coding-initiative-ncci-edits

NOT SEPARATELY PAYABLE TOGETHER—NO NCCI-ASSOCIATED MODIFIER BYPASSES THE EDIT (modifier indicator 0)
78018    78018 is Column One, A9521 is Column Two—A9521 denies
78070    78070 is Column One, A9521 is Column Two—A9521 denies
78102    78102 is Column One, A9521 is Column Two—A9521 denies
78103    78103 is Column One, A9521 is Column Two—A9521 denies
78122    78122 is Column One, A9521 is Column Two—A9521 denies
78140    78140 is Column One, A9521 is Column Two—A9521 denies
78215    78215 is Column One, A9521 is Column Two—A9521 denies
78226    78226 is Column One, A9521 is Column Two—A9521 denies
78227    78227 is Column One, A9521 is Column Two—A9521 denies
78305    78305 is Column One, A9521 is Column Two—A9521 denies
78315    78315 is Column One, A9521 is Column Two—A9521 denies
78451    78451 is Column One, A9521 is Column Two—A9521 denies
78452    78452 is Column One, A9521 is Column Two—A9521 denies
78472    78472 is Column One, A9521 is Column Two—A9521 denies
78580    78580 is Column One, A9521 is Column Two—A9521 denies
78608    78608 is Column One, A9521 is Column Two—A9521 denies
78630    78630 is Column One, A9521 is Column Two—A9521 denies
78707    78707 is Column One, A9521 is Column Two—A9521 denies
78708    78708 is Column One, A9521 is Column Two—A9521 denies
78800    78800 is Column One, A9521 is Column Two—A9521 denies
78808    78808 is Column One, A9521 is Column Two—A9521 denies
A9512    A9521 is Column One, A9512 is Column Two—A9512 denies

BILLABLE TOGETHER ONLY WHEN AN NCCI-ASSOCIATED MODIFIER IS APPROPRIATE (modifier indicator 1)
78300    78300 is Column One, A9521 is Column Two—A9521 denies
78802    78802 is Column One, A9521 is Column Two—A9521 denies
78804    78804 is Column One, A9521 is Column Two—A9521 denies

MUE units per patient per date of service: not published