2027 ICD-10-CM Diagnosis Code G71.8Other primary disorders of muscles
ICD-10-CM Codes›G00–G99›G70-G73›G71
- Billable — Valid for Submission
- Not Chronic
G71.8 is a billable ICD-10-CM diagnosis code for other primary disorders of muscles. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Myopathies.
G71.8 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G71.8 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
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.
- Alpha-B crystallin-related late-onset myopathy
- Amyotrophy caused by herpes zoster
- Atrophy of tongue
- Autosomal dominant distal axonal motor neuropathy, myofibrillar myopathy syndrome
- Autosomal dominant distal hereditary motor neuropathy
- Benign monomelic amyotrophy
- Benign monomelic amyotrophy of lower limb
- Benign monomelic amyotrophy of upper limb
- Childhood-onset autosomal recessive myopathy with external ophthalmoplegia
- Chronic intestinal pseudo-obstruction
- Fatal infantile hypertonic myofibrillar myopathy
- Hereditary hollow viscus myopathy
- Hereditary inclusion body myopathy type 4
- Hereditary myopathy limited to females
- Hollow visceral myopathy
- Kyphosis, lateral tongue atrophy, myofibrillar myopathy syndrome
- Myopathy due to calsequestrin and SERCA1 protein overload
- Myopathy with cytoplasmic inclusions
- Proximal myopathy
- Proximal myopathy with extrapyramidal signs
- X-linked limb girdle muscular dystrophy with normal dystrophin
- X-linked muscular dystrophy with limb girdle distribution
- X-linked myopathy with postural muscle atrophy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G71.8: its own notes plus those printed at G71 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
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 G71.8, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming G71.8: its condition is not part of those codes, and both may be reported when the patient has both.
- Block M60-M63 Disorders of muscles
Code First 1
These codes say to code first a condition named in the note, and G71.8 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
specified NEC G71.8
specified NEC G71.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Muscle Disorders
Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G71.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G71.8Overview
What is the ICD-10 code for other primary disorders of muscles?
The ICD-10-CM code for other primary disorders of muscles is G71.8 (sometimes written as G718). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G71.8 (Primary disorders of muscles) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other primary disorders of muscles on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G71.8 group to?
When other primary disorders of muscles is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of G71.8?
Under the General Equivalence Mappings, other primary disorders of muscles converts to ICD-9-CM 359.89 (myopathies NEC). The mapping is approximate, so confirm the match fits the documentation.
Does G71.8 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: G71.8 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 (Polyneuropathy).
