Question: If a physiatrist does trigger point injections in the trapezius, right and left, would that count as only one muscle? Answer: No. The right trapezius is a different muscle from the left trapezius. They each have separate and distinct insertion and origin (mirror image). Just like if a patient had a sprain/strain in their left biceps and additionally a sprain/strain in their right biceps, it is easy to "see" that those are two different muscles. Multiple injections into the same muscle would NOT be counted as separate trigger points.
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So if a provider has clear documentation of separate trigger points in the right trapezius, right levator scapulae, left trapezius, and left levator scapulae, you should report one unit of 20553 (Injection[s]; single or multiple trigger point[s], three or more muscles) and indicate the physiatrist injected the trigger points of three or more muscles.