2027 ICD-10-CM Diagnosis Code G70.89Other specified myoneural disorders
ICD-10-CM Codes›G00–G99›G70-G73›G70
- Billable — Valid for Submission
- Risk Adjusts — HCC 196
- Chronic Condition
G70.89 is a billable ICD-10-CM diagnosis code for other specified myoneural disorders. 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. Coders also document this condition as dysthymia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.
For Medicare Advantage risk adjustment, G70.89 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
G70.89 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.
- Dysthymia
- Generalized hypotonia due to neuromuscular junction defect
- Generalized neuromuscular exhaustion syndrome
- Hereditary motor end-plate disease
- Neuromuscular junction disorder
- Neuromuscular junction disorder due to Lambert-Eaton syndrome
- Periodic paralysis
- Periodic paralysis with transient compartment-like syndrome
- Slow channel syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G70.89: 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.
Disorder (of) See Also: Disease;
specified NEC G70.89
specified NEC G70.89
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 G70.89 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G70.89Overview
What is the ICD-10 code for other specified myoneural disorders?
The ICD-10-CM code for other specified myoneural disorders is G70.89 (sometimes written as G7089). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G70.89 (Other specified myoneural disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified myoneural disorders on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G70.89 group to?
When other specified myoneural disorders 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 G70.89 be reported with A05.1?
Not as a rule. The Excludes1 note at G70, which applies to G70.89, 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 G70.89?
Under the General Equivalence Mappings, other specified myoneural disorders converts to ICD-9-CM 358.8 (myoneural disorders NEC). The mapping is approximate, so confirm the match fits the documentation.
What HCC is G70.89?
G70.89 (other specified myoneural disorders) 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 G70.89 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G70.89 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.
