Is ICD-10-CM code G70 billable?

No, G70 (Myasthenia gravis and other myoneural disorders) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code G70 belong to?

G70 belongs to Chapter 6 of the ICD-10-CM tabular list: G00–G99 (Diseases of the Nervous System).

G70Not billable, use a more specific code below

Myasthenia gravis and other myoneural disorders

In Diseases of myoneural junction and muscle (G70-G73), chapter 6: Diseases of the Nervous System

8 billable codes under G70: 1 is an MCC, 2 are a CC; all map to HCC 196 (Myasthenia Gravis without (Acute) Exacerbation and Other Myoneural Disorders), HCC 195 (Myasthenia Gravis with (Acute) Exacerbation).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Instructional notes

Excludes1: not coded here, use a different code

botulism (A05.1, A48.51-A48.52)
transient neonatal myasthenia gravis (P94.0)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.

Dominant/nondominant side (page 45)
Pain - Category G89 (page 45)

Read Section I.C.6 (page 45)

All codes under G70

G70 can't be used on a claim. Pick a billable code below; grey headings group them.

G70 MS-DRGs

As the principal diagnosis, the billable codes under G70 group to MS-DRG 056, 057, 073, or 074 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 056 Degenerative Nervous System Disorders with MCC (4 of 8 codes)
DRG 057 Degenerative Nervous System Disorders without MCC (4 of 8 codes)
DRG 073 Cranial and Peripheral Nerve Disorders with MCC (4 of 8 codes)
DRG 074 Cranial and Peripheral Nerve Disorders without MCC (4 of 8 codes)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Myasthenia Gravis

Myasthenia gravis, sometimes called MG, is a chronic (long-lasting) disease that causes weakness in your voluntary muscles. The voluntary muscles are the ones that you can control. They include the muscles you use for:

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.