VA Disability Rating for Progressive Muscular Atrophy (DC 8023)
Diagnostic Code 8023 · 38 CFR §4.124a
What Is It?
Progressive muscular atrophy is a motor neuron disease that attacks the lower motor neurons only, producing progressive weakness, muscle wasting, and fasciculations without the spasticity and brisk reflexes that mark upper motor neuron involvement. It is closely related to amyotrophic lateral sclerosis and many neurologists treat it as a variant within that spectrum; a substantial share of cases develop upper motor neuron signs over time and are then reclassified. That distinction matters for service connection, because the two conditions reach it differently. 38 CFR §3.318 grants presumptive service connection for amyotrophic lateral sclerosis by name — any veteran with 90 or more days of continuous active service, no exposure proof required — and it names no other motor neuron disease. Progressive muscular atrophy has its own route: 38 CFR §3.309(a) lists "Atrophy, progressive muscular" among the chronic diseases, presumed service-connected under §3.307(a)(3) when manifest to a degree of 10 percent or more within one year of separation. 38 CFR §4.124a opens the neurological schedule with a bracketed instruction: disability from the diseases it lists "may be rated from 10 percent to 100 percent in proportion to the impairment of motor, sensory, or mental function," referring the rater to the appropriate body system of the schedule for each manifestation. Inside the 8000–8025 block the schedule prints either a single flat percentage, a single minimum rating, or no percentage at all — there is no severity ladder anywhere in it. A Note closing the block adds two conditions: the minimum ratings for residuals require ascertainable residuals, and when a rating above the minimum is assigned, the diagnostic codes used as the basis of that evaluation must be cited alongside the code identifying the diagnosis. DC 8023 prints exactly one figure: "Minimum rating — 30."
Rating Criteria
| Rating | Criteria |
|---|---|
| 30% | Minimum rating. This is the only percentage 38 CFR §4.124a attaches to DC 8023, and the schedule prints no steps above it. §4.124a's preamble and §4.120 both govern what happens above the floor: disability in this field is rated in proportion to the impairment of motor, sensory, or mental function, with partial loss of use of one or more extremities from a neurological lesion rated by comparison with the mild, moderate, severe, or complete paralysis of the relevant peripheral nerves. The Note closing the 8000–8025 block requires ascertainable residuals for the minimum and requires that any rating above it cite the diagnostic codes used as its basis. In practice the weakness and wasting in each affected distribution are evaluated by comparison with the peripheral nerve codes, with bulbar involvement, respiratory insufficiency, and any other manifestation evaluated under the schedule for that system. |
Evidence Needed
A neurologist's diagnosis supported by EMG showing chronic and active denervation in a lower motor neuron pattern is the foundation, with nerve conduction studies and MRI ruling out structural and other causes. Serial examinations documenting progression are what separate this from a static process. Because everything above the 30 percent floor is built in proportion to impairment, the findings that move the percentage are the quantified ones: strength grade by individual muscle group, limb circumference documenting wasting, functional measures such as walking distance and grip, pulmonary function testing including forced vital capacity as respiratory muscles weaken, and a swallowing evaluation if bulbar muscles become involved. For the presumptive route, the diagnosis and earliest documented symptoms against the separation date.
C&P Exam Tips
Ask that strength be graded muscle group by muscle group rather than described as generalized weakness — the nerve codes that build the rating are distribution-specific, and a general note cannot be cited under any of them. Point out visible wasting and fasciculations and ask that limb circumference be measured. Describe the progression concretely: what you could do a year ago and what you can do now. Report any change in breathing, speech, or swallowing, and bring pulmonary function testing if you have it. Bring serial EMGs if available. Where function has declined to the point of needing help with dressing, feeding, or bathing, request a special monthly compensation evaluation.
How to File
File VA Form 21-526EZ claiming progressive muscular atrophy under DC 8023 and cite 38 CFR §4.124a. If the disease became manifest to a degree of 10 percent or more within one year of separation, cite 38 CFR §3.309(a) and §3.307(a)(3) — "Atrophy, progressive muscular" is on that list by name. If your diagnosis has been revised to amyotrophic lateral sclerosis, claim it under DC 8017 and cite 38 CFR §3.318 instead, which requires only 90 days of continuous active service and no exposure evidence. Attach the EMG, the neurology records, and serial examinations showing progression, and claim the individual deficits by distribution, since those are the codes any evaluation above 30 percent must be built from and cited under.
Common Mistakes
Assuming the ALS presumptive covers it. 38 CFR §3.318 names amyotrophic lateral sclerosis and nothing else, so a PMA diagnosis needs either the §3.309(a) route or direct service connection unless the diagnosis itself is revised to ALS. Reading 30 percent as a tier with 60 and 100 above it — the schedule prints a minimum and nothing more. Describing weakness generally instead of by muscle group. Waiting for the disease to advance before filing. Not tracking respiratory function, which is both a safety matter and a rating one.
Frequently Asked Questions
Does the ALS presumptive cover progressive muscular atrophy?
Not as written. 38 CFR §3.318 grants presumptive service connection for "amyotrophic lateral sclerosis" specifically — the section names that disease and no other motor neuron disease — for any veteran with 90 or more days of continuous active service. Whether a particular PMA diagnosis is treated as falling within ALS is a medical question about the diagnosis itself, not something the regulation resolves. The route that does name this condition is 38 CFR §3.309(a), which lists "Atrophy, progressive muscular" among the chronic diseases, with the one-year window in §3.307(a)(3). Worth asking your neurologist to address the classification directly in the record.
Is there a rating above 30 percent for PMA?
Yes, but not from a tier under this code. 38 CFR §4.124a attaches one figure to DC 8023 — "Minimum rating — 30" — and prints nothing above it. Everything above the floor is built in proportion to the impairment of motor, sensory, or mental function, with weakness in each extremity rated by comparison with the mild, moderate, severe, or complete paralysis of the relevant peripheral nerves. Because the disease progresses, that percentage should be revisited as function declines, and the Note closing the block requires each decision above the minimum to cite the codes it was built from.
How is PMA different from ALS?
Both are motor neuron diseases. ALS involves both upper and lower motor neurons — weakness with spasticity, brisk reflexes, and often bulbar signs. PMA involves the lower motor neurons only, so the picture is flaccid weakness, wasting, and fasciculations without the upper motor neuron findings. PMA typically progresses more slowly, and a meaningful share of cases eventually develop upper motor neuron signs and are reclassified as ALS. Because the two conditions carry different codes and different presumptive routes, the diagnosis in the record is worth keeping current.