G12.25
BillableProgressive spinal muscle atrophy
HCC Category Mapping
V28HCC 190 — Motor Neuron Disease, Including Amyotrophic Lateral Sclerosis
0.935V24HCC 73 — Amyotrophic Lateral Sclerosis and Other Motor Neuron Disease
0.896ESRDHCC 73 — Amyotrophic Lateral Sclerosis and Other Motor Neuron Disease
0.000RxHCCHCC 154 — Motor Neuron Disease
0.000What This Code Means
A progressive disease affecting the nerve cells in the spinal cord that control leg and trunk muscles, causing gradual weakness and wasting.
Coding Tips
- •Document the distribution of muscle weakness (lower extremities, trunk) to support this diagnosis
- •Differentiate from bulbar-onset disease by confirming primary spinal muscle involvement
Clinical Significance
Progressive spinal muscle atrophy is a lower motor neuron variant of motor neuron disease causing gradual muscle weakness and wasting, primarily in the legs and trunk. It progresses more slowly than amyotrophic lateral sclerosis and has better survival, but still causes significant disability through progressive proximal and distal weakness.
Documentation Requirements
- ✓Lower motor neuron signs documented (muscle atrophy, fasciculations, hyporeflexia)
- ✓Absence of upper motor neuron signs (no spasticity, no hyperreflexia, no Babinski)
- ✓Electromyography showing denervation pattern in spinal muscles
- ✓Progressive weakness and wasting primarily in limbs and trunk
- ✓Distribution of weakness documented (proximal vs distal, upper vs lower extremity)
- ✓Serial examinations confirming progressive lower motor neuron pattern
Commonly Confused Codes
G12.21 — Amyotrophic lateral sclerosis: involves upper motor neurons in addition to lower; progressive spinal muscle atrophy is lower onlyG12.1 — Other inherited spinal muscular atrophy: genetic childhood/adolescent onset disease, different from adult progressive formG12.22 — Progressive bulbar palsy: predominantly affects bulbar muscles rather than spinal musclesG12.23 — Primary lateral sclerosis: upper motor neuron only, opposite pattern from progressive spinal muscle atrophy
Code Hierarchy
└G12Spinal muscular atrophy and related syndromes└G12.2Motor neuron disease└G12.25Progressive spinal muscle atrophy
└G12.25Progressive spinal muscle atrophy