ICD-10-CM 2027
ICD-10 code for Causalgia
From the official ICD-10-CM alphabetic index entry “Causalgia (upper limb)”. Page updated September 29, 2026.
About coding Causalgia
The ICD-10-CM code for Causalgia is G56.4 (Causalgia of upper limb). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G56.4.
Within G56 (mononeuropathies of upper limb), G56.4 is specifically for Causalgia of upper limb. Related codes cover carpal tunnel syndrome (G56.0), other lesions of median nerve (G56.1), lesion of ulnar nerve (G56.2), lesion of radial nerve (G56.3), other specified mononeuropathies of upper limb (G56.8) and unspecified mononeuropathy of upper limb (G56.9).
To report this condition, pick the subcode that matches the documentation: G56.40 (limb), G56.41 (limb), G56.42 (limb) and G56.43 (limbs).
Don't report G56.4 together with the conditions in its Excludes1 note: 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-) and 1 more.
More specific Causalgia codes (official index)
- lower limb G57.7 — Causalgia of lower limb
Don't confuse with (Excludes1 for G56.4)
Common questions about Causalgia ICD-10 codes
What is the ICD-10 code for Causalgia?
- G56.4 — Causalgia of upper limb (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: G57.7.
What is the ICD-10 code for lower limb causalgia?
- G57.7 — Causalgia of lower limb (header code; choose a more specific subcode).
Is G56.4 billable?
- No. G56.4 is a header code. Report one of its more specific subcodes instead.