G56.43 (Causalgia of bilateral upper limbs) compared with M79.2 (Neuralgia and neuritis, unspecified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Not coded here — these two are mutually exclusive.
“neuralgia NOS (M79.2)”
An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.
Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a
No — do not report together. G56.43 carries an Excludes1 note covering M79.2: “neuralgia NOS (M79.2)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
| G56.43Causalgia of bilateral upper limbs | M79.2Neuralgia and neuritis, unspecified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Causalgia of bilateral upper limbs is a billable ICD-10-CM diagnosis code (G56.43). | Neuralgia and neuritis, unspecified is a billable ICD-10-CM diagnosis code (M79.2). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources