HCPCS Code Modifiers
HCPCS National Level II Modifiers
section notes
N Modifiers
section notes
N1   Group 1 oxygen cov crit met
N2   Group 2 oxygen cov crit met
N3   Group 3 oxygen cov crit met
NB   Drug specific nebulizer
NR   New when rented
NU   New equipment
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