G70.81 — Lambert-Eaton syndrome in disease classified elsewhere
G70.81 is a billable, specific ICD-10-CM code for lambert-eaton syndrome in disease classified elsewhere. It is valid for submission on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- Lambert-Eaton syndrome in neoplastic disease (G73.1)
Code first
The underlying condition must be sequenced before this code.
- underlying disease
Excludes1 inherited from the categories above G70.81
These are not written on G70.81, but they bind it: a note on a category applies to every code beneath it. Billing G70.81 with anything listed here is a denial.
Other codes that can never be billed with G70.81
These codes carry an Excludes1 note pointing at G70.81. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading G70.81 alone.
- G73.1Lambert-Eaton syndrome in neoplastic disease
Risk adjustment
G70.81 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 196 Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders0.516 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
G70.81 is named in 35 Medicare coverage policies — 35 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53052Billing and Coding: Home Health Speech-Language Pathology
- A53057Billing and Coding: Home Health Occupational Therapy
- A53058Billing and Coding: Home Health Physical Therapy
- A53064Billing and Coding: Outpatient Occupational Therapy
How G70.81 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G70.81.
- Syndrome›Lambert-Eaton›in›specified disease NEC
Code history
G70.81 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share G70.8. If G70.81 is not quite right, the correct code is usually one of these.
Questions about G70.81
- Is G70.81 a billable ICD-10-CM code?
- Yes. G70.81 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G70.81 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Diseases of myoneural junction and muscle (G70-G73).
- What cannot be coded together with G70.81?
- G70.81 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above G70.81 (G70) and apply to it just the same.