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CPT® Modifier 6D
Deleted

Official Description

SMN1/SMN2 (autosomal recessive spinal muscular atrophy)

© Copyright 2026 American Medical Association. All rights reserved.

Short Descr	SMN1/SMN2 (autosomal recessive spinal muscular at
Medium Descr	SMN1/SMN2 (autosomal recessive spinal muscular atrophy)

Modifiers

-/+ Deleted, Replaced, Expanded Codes

0A-9Z Genetic Testing Code Modifiers

6A-6Z Muscular, Non-Neoplastic

6A DMD, commonly called dystrophin (Duchenne/Becker muscular dystrophy

6B DMPK (myotonic dystrophy, type 1)

6C ZNF-9 (myotonic dystrophy, type 2)

6D SMN1/SMN2 (autosomal recessive spinal muscular atrophy)

6E MTTK, commonly called tRNAlys (myotonic epilepsy, MERRF)

6F MTTL1, commonly called tRNAleu (mitochondrial encephalomyopathy, MELAS)

6Z Muscular, not otherwise specified

Date	Action	Notes
2013-01-01	Deleted	Removed from the CPT codebook.

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