G70.80 vs G73.1
G70.80 (Lambert-Eaton syndrome, unspecified) compared with G73.1 (Lambert-Eaton syndrome in neoplastic disease), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. G73.1 carries an Excludes1 note covering G70.80: “Lambert-Eaton syndrome not associated with neoplasm (G70.80-G70.81)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G70.80Lambert-Eaton syndrome, unspecified | G73.1Lambert-Eaton syndrome in neoplastic disease | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Lambert-Eaton syndrome, unspecified is a billable ICD-10-CM diagnosis code (G70.80). | Lambert-Eaton syndrome in neoplastic disease is a billable ICD-10-CM diagnosis code (G73.1). |
| Includes | Lambert-Eaton syndrome NOS | — |
| Code first | — | underlying neoplasm (C00-D49) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources