2027 ICD-10-CM Diagnosis Code G70.9Myoneural disorder, unspecified
ICD-10-CM Codes›G00–G99›G70-G73›G70
- Billable — Valid for Submission
- Risk Adjusts — HCC 196
- Chronic Condition
G70.9 is a billable ICD-10-CM diagnosis code for myoneural disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.
For Medicare Advantage risk adjustment, G70.9 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
G70.9 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.
- Cardiomyopathy due to neuromuscular disorder
- Chronic respiratory failure
- Chronic respiratory failure due to neuromuscular disease
- Denervation
- Dilated cardiomyopathy due to neuromuscular disorder
- Disorder of neuromuscular transmission
- Hypertrophic cardiomyopathy due to neuromuscular disorder
- Hypoventilation during sleep due to neuromuscular disorder
- Myasthenic facies
- Myoneural disorder
- Neonatal hypotonia
- Neonatal muscle tone disorder
- Neonatal neuromuscular disorder
- Neuromyopathy
- Restrictive lung disease
- Restrictive lung mechanics due to neuromuscular disease
- Sleep hypoventilation
- Sleep related hypoventilation or hypoxemia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G70.9: 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.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
myoneural G70.9
neuromuscular system G70.9
Disorder (of) See Also: Disease;
myoneural G70.9
neuromuscular G70.9
Myasthenia G70.9
Neuromyopathy G70.9
Syndrome See Also: Disease;
myasthenic G70.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Neuromuscular Disorders
Neuromuscular disorders affect your neuromuscular system. They can cause problems with:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G70.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G70.9Overview
What is the ICD-10 code for myoneural disorder, unspecified?
The ICD-10-CM code for myoneural disorder, unspecified is G70.9 (sometimes written as G709). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G70.9 (Myasthenia gravis and other myoneural disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report myoneural disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G70.9 group to?
When myoneural disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.
Can G70.9 be reported with A05.1?
Not as a rule. The Excludes1 note at G70, which applies to G70.9, 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 is the ICD-9 equivalent of G70.9?
Under the General Equivalence Mappings, myoneural disorder, unspecified converts to ICD-9-CM 358.9 (myoneural disorders NOS). The mapping is a direct match.
What HCC is G70.9?
G70.9 (myoneural disorder, 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 G70.9 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G70.9 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.
