G56.42 is the authoritative medical code for Causalgia of left upper limb. This classification is used in medical billing and clinical recording to specify the clinical criteria for causalgia of left upper limb (ICD-10-CM G56.42), ensuring healthcare documentation aligns with current federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Causalgia of left upper limb is a billable ICD-10-CM diagnosis code G56.42. Excludes1 (not coded here): complex regional pain syndrome I of lower limb G90.52-; complex regional pain syndrome I of upper limb G90.51-; complex regional pain syndrome II of lower limb G57.7-; reflex sympathetic dystrophy of lower limb G90.52-; reflex sympathetic dystrophy of upper limb G90.51-; current traumatic nerve disorder - see nerve injury by body region; current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region; neuralgia NOS M79.2; neuritis NOS M79.2; peripheral neuritis in pregnancy O26.82-; radiculitis NOS M54.1-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G56.42 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- complex regional pain syndrome I of lower limb G90.52-
- complex regional pain syndrome I of upper limb G90.51-
- complex regional pain syndrome II of lower limb G57.7-
- reflex sympathetic dystrophy of lower limb G90.52-
- reflex sympathetic dystrophy of upper limb G90.51-
- current traumatic nerve disorder - see nerve injury by body region
- current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
- neuralgia NOS M79.2
- neuritis NOS M79.2
- peripheral neuritis in pregnancy O26.82-
- radiculitis NOS M54.1-
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with G56.42?
Per official ICD-10-CM Excludes1 instructions, G56.42 must not be reported together with: complex regional pain syndrome I of lower limb (G90.52-); complex regional pain syndrome I of upper limb (G90.51-); complex regional pain syndrome II of lower limb (G57.7-); reflex sympathetic dystrophy of lower limb (G90.52-).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to G56.42 in its code family, with their registry titles.
- G56.32 — Lesion of radial nerve, left upper limb
- G56.33 — Lesion of radial nerve, bilateral upper limbs
- G56.4 — Causalgia of upper limb
- G56.40 — Causalgia of unspecified upper limb
- G56.41 — Causalgia of right upper limb
- G56.43 — Causalgia of bilateral upper limbs
- G56.8 — Other specified mononeuropathies of upper limb
- G56.80 — Other specified mononeuropathies of unspecified upper limb
- G56.81 — Other specified mononeuropathies of right upper limb
- G56.82 — Other specified mononeuropathies of left upper limb
View all 35 codes in the G56 family