2027 ICD-10-CM Diagnosis Code G70.80Lambert-Eaton syndrome, unspecified
ICD-10-CM Codes›G00–G99›G70-G73›G70
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 196
- Chronic Condition
G70.80 is a billable ICD-10-CM diagnosis code for Lambert-Eaton syndrome, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 56 through 57. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 72 closely related codes. Coders also document this condition as eaton Lambert syndrome without underlying malignancy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.
For Medicare Advantage risk adjustment, G70.80 maps to CMS-HCC Category 196 (Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders) under the V28 model, adding a risk factor of about 0.516 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G70.80 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Eaton Lambert syndrome without underlying malignancy
- Eaton-Lambert syndrome
- Neuromuscular junction disorder due to Lambert-Eaton syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G70.80: its own notes plus those printed at G70 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Lambert-Eaton syndrome NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name G70.80, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Syndrome See Also: Disease;
Lambert-Eaton G70.80
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Lambert-Eaton Myasthenic Syndrome
an autoimmune disease characterized by weakness and fatigability of proximal muscles, particularly of the pelvic girdle, lower extremities, trunk, and shoulder girdle. there is relative sparing of extraocular and bulbar muscles. carcinoma, small cell of the lung is a frequently associated condition, although other malignancies and autoimmune diseases may be associated. muscular weakness results from impaired impulse transmission at the neuromuscular junction. presynaptic calcium channel dysfunction leads to a reduced amount of acetylcholine being released in response to stimulation of the nerve. (from adams et al., principles of neurology, 6th ed, pp 1471)
Patient EducationClinical
Autoimmune Diseases
Your immune system protects you from disease and infection by attacking germs that get into your body, such as viruses and bacteria. Your immune system can tell that the germs aren't part of you, so it destroys them. If you have an autoimmune disease, your immune system attacks the healthy cells of your organs and tissues by mistake.
The full article covers:
- What are autoimmune diseases?
- What causes autoimmune diseases?
- Who is at risk for autoimmune diseases?
- What are the symptoms of autoimmune diseases?
- How are autoimmune diseases diagnosed?
- What are the treatments for autoimmune diseases?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G70.80 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G70.80Overview
What is the ICD-10 code for Lambert-Eaton syndrome, unspecified?
The ICD-10-CM code for Lambert-Eaton syndrome, unspecified is G70.80 (sometimes written as G7080). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G70.80 (Other specified myoneural disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Lambert-Eaton syndrome, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G70.80 group to?
When Lambert-Eaton syndrome, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 57, 56, with relative weights from 1.2835 to 2.2649 depending on complications. Higher weights mean higher Medicare reimbursement.
Is G70.80 a CC or MCC?
CMS lists G70.80 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 72 closely related codes in its exclusion list.
Can G70.80 be reported with A05.1?
Not as a rule. The Excludes1 note at G70, which applies to G70.80, lists "botulism (A05.1, A48.51-A48.52)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is G70.80?
G70.80 (Lambert-Eaton syndrome, unspecified) maps to CMS-HCC Category 196 (Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders), commonly written as HCC 196, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 75 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 153.
Does G70.80 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G70.80 adds a risk adjustment factor of about 0.516 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.248 to 0.642 depending on the payment segment). A more severe related category (HCC 195) supersedes it when both are reported. See the full factor table on the HCC 196 category page.
